0001564590-18-010312 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 25, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	ACCURAY INC
Entity Central Index Key	0001138723
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Current Reporting Status	Yes
Trading Symbol	ARAY
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		85,638,116
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 70,392	$ 72,084
Short-term investments	888	23,909
Restricted cash	1,880	12,829
Accounts receivable, net of allowance for doubtful accounts of $346 and $420 as of March 31, 2018 and June 30, 2017, respectively	81,846	72,789
Inventories	115,900	105,054
Prepaid expenses and other current assets	16,653	18,988
Deferred cost of revenue	2,933	3,350
Total current assets	290,492	309,003
Property and equipment, net	24,462	23,062
Goodwill	58,021	57,812
Intangible assets, net	857	964
Restricted cash	638	322
Other assets	12,849	15,301
Total assets	387,319	406,464
Current liabilities:
Accounts payable	23,175	17,486
Accrued compensation	27,212	25,402
Other accrued liabilities	22,707	23,870
Short-term debt		113,023
Customer advances	22,652	16,926
Deferred revenue	84,058	87,785
Total current liabilities	179,804	284,492
Long-term liabilities:
Long-term other liabilities	11,073	10,068
Deferred revenue	17,343	13,823
Long-term debt	134,321	51,548
Total liabilities	342,541	359,931
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.001 par value; authorized: 200,000,000 shares as of March 31, 2018 and June 30, 2017, respectively; issued and outstanding: 85,583,802 and 83,739,804 shares at March 31, 2018 and June 30, 2017, respectively	86	84
Additional paid-in-capital	516,173	496,887
Accumulated other comprehensive income (loss)	1,858	(52)
Accumulated deficit	(473,339)	(450,386)
Total stockholders' equity	44,778	46,533
Total liabilities and stockholders' equity	$ 387,319	$ 406,464

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 346	$ 420
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	200,000,000	200,000,000
Common stock, issued shares	85,583,802	83,739,804
Common stock, outstanding shares	85,583,802	83,739,804

Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net revenue:
Products	$ 43,244	$ 48,032	$ 129,266	$ 119,029
Services	56,588	49,280	161,845	152,291
Total net revenue	99,832	97,312	291,111	271,320
Cost of revenue:
Cost of products	25,332	29,574	74,291	75,895
Cost of services	38,251	32,313	103,110	97,269
Total cost of revenue	63,583	61,887	177,401	173,164
Gross profit	36,249	35,425	113,710	98,156
Operating expenses:
Research and development	13,906	12,484	42,663	36,657
Selling and marketing	14,612	13,025	43,241	41,247
General and administrative	11,552	11,184	34,696	32,890
Total operating expenses	40,070	36,693	120,600	110,794
Loss from operations	(3,821)	(1,268)	(6,890)	(12,638)
Other expense, net	(4,465)	(2,919)	(14,774)	(11,044)
Loss before provision for income taxes	(8,286)	(4,187)	(21,664)	(23,682)
Provision for income taxes	566	842	1,289	642
Net loss	$ (8,852)	$ (5,029)	$ (22,953)	$ (24,324)
Net loss per share - basic and diluted	$ (0.10)	$ (0.06)	$ (0.27)	$ (0.30)
Weighted average common shares used in computing net loss per share:
Basic and diluted	85,459	82,913	84,594	82,268
Net loss	$ (8,852)	$ (5,029)	$ (22,953)	$ (24,324)
Foreign currency translation adjustment	909	435	1,467	(771)
Unrealized gain (loss) on investments, net of tax	319	(6)	443	(76)
Comprehensive loss	$ (7,624)	$ (4,600)	$ (21,043)	$ (25,171)

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net loss	$ (22,953)	$ (24,324)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,387	13,848
Share-based compensation	9,074	9,985
Amortization of debt issuance costs	1,259	1,165
Amortization and accretion of discount and premium on investments	(15)	70
Accretion of interest on debt	2,589	2,117
Loss on sales of investment	77
Recovery of bad debt, net	(74)	(64)
Provision for write-down of inventories	1,104	1,131
(Gain) loss on disposal of property and equipment	(8)	4
Loss on extinguishment of debt	3,452
Changes in assets and liabilities:
Accounts receivable	(8,435)	(28,676)
Inventories	(14,656)	(2,386)
Prepaid expenses and other assets	3,851	(3,411)
Deferred cost of revenue	630	2,474
Accounts payable	5,463	8,249
Accrued liabilities	(2,000)	2,120
Customer advances	5,321	(2,914)
Deferred revenues	(1,621)	(2,907)
Net cash used in operating activities	(9,555)	(23,519)
Cash flows from investing activities
Purchases of property and equipment, net	(4,598)	(3,619)
Purchases of investments	(5,940)	(14,992)
Sales and maturities of investments	29,875	38,179
Net cash provided by investing activities	19,337	19,568
Cash flows from financing activities
Proceeds from employee stock plans	2,880	3,075
Taxes paid related to net share settlement of equity awards	(293)	(841)
Proceeds from issuance of Term Loan, net	38,829
Proceeds from issuance of Convertible Notes, net	27,282
Payments made to note holders	(69,797)	(43,658)
Borrowings (repayments) under Revolving Credit Facility, net	(23,541)
Net cash used in financing activities	(24,640)	(41,424)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,533	(2,349)
Net decrease in cash, cash equivalents and restricted cash	(12,325)	(47,724)
Cash, cash equivalents and restricted cash at beginning of period	85,235	122,133
Cash, cash equivalents and restricted cash at end of period	$ 72,910	$ 74,409

The Company and its Significant Accounting Policies	9 Months Ended
The Company and its Significant Accounting Policies	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company and its Significant Accounting Policies	Note 1. The Company and its Significant Accounting Policies The Company Accuray Incorporated (together with its subsidiaries, the “Company” or “Accuray”) designs, develops and sells advanced radiosurgery and radiation therapy systems for the treatment of tumors throughout the body. The Company is incorporated in Delaware and has its principal place of business in Sunnyvale, California. The Company has primary offices in the United States, Switzerland, China, Hong Kong and Japan and conducts its business worldwide. Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant inter-company transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures have been condensed or omitted pursuant to such rules and regulations. The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of the periods presented. Certain amounts in the prior year’s condensed consolidated balance sheet and condensed consolidated statement of cash flows have been reclassified to conform to the current period’s presentation. The results for the three and nine months ended March 31, 2018 are not necessarily indicative of the results to be expected for the fiscal year ending June 30, 2018, or for any other future interim period or fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes for the fiscal year ended June 30, 2017 included in the Company’s Annual Report on Form 10-K filed with the SEC on August 25, 2017. Significant Accounting Policies There have been no material changes to the Company’s accounting policies from the information provided in Note 2. Summary of Significant Accounting Policies to the audited condensed consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2017.

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Note 2. Recent Accounting Pronouncements Accounting Pronouncement Recently Adopted In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718). The new guidance simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. In addition, the guidance provides an option to recognize forfeitures as they occur versus estimating them at the time of grant. The amendments in this standard are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company adopted ASU No. 2016-09 as required in the first quarter of fiscal year 2018 and has elected to continue the use of its forfeiture estimation method for share-based payment awards. The adoption of ASU 2016-09 did not have a material impact on the Company’s consolidated financial statements and related disclosures. Accounting Pronouncements Not Yet Effective In February 2018, the FASB issued ASU No. 2018-2, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that allows companies to reclassify from Accumulated Other Comprehensive Income to Retained Earnings stranded tax effects resulting from the enactment of the Tax Cuts and Jobs Act (the "Tax Act"). The guidance will be effective for the Company in its first quarter of fiscal year 2020. Early adoption is permitted. The guidance should be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. The Company has not yet selected a transition method, has not yet determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging. This guidance simplifies the application and administration of hedge accounting. The guidance amends the presentation and disclosure requirements and changes how companies assess effectiveness. The guidance is intended to more closely align hedge accounting with companies' risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The guidance will be effective for the Company in its first quarter of fiscal year 2020. Early adoption is permitted. The guidance is required to be adopted on a prospective basis. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718)—Scope of Modification Accounting. This guidance redefines which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting for a share-based payment. This guidance will be effective for the Company in the first quarter of its fiscal year 2019. The guidance is required to be adopted on a prospective basis. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In March 2017, the FASB issued ASU No. 2017-07, Compensation—Retirement Benefits (Topic 715)—Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This guidance revises the presentation of employer-sponsored defined benefit pension and other postretirement plans for the net periodic benefit cost in the statement of operations and requires that the service cost component of net periodic benefit be presented in the same income statement line items as other employee compensation costs for services rendered during the period. The other components of the net benefit costs are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of income from operations. This guidance allows only the service cost component of net periodic benefit costs to be eligible for capitalization. The guidance will be effective for the Company in the first quarter of its fiscal year 2019 and is required to be adopted on a retrospective basis. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other Topics (Topic 350)-Simplifying the Test for Goodwill Impairment. This guidance simplifies the measurement of goodwill by eliminating the Step 2 impairment test. The new guidance requires companies to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. This guidance will be effective for the Company beginning in its first quarter of fiscal year 2021. The amendment is required to be adopted prospectively. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This guidance will be effective for the Company in the first quarter of its fiscal year 2019. The guidance is required to be adopted on a retrospective basis, unless it is impracticable whereby the guidance can be adopted on a prospective basis as of the earliest date practicable. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU No. 2016-13 Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 requires measurement and recognition of expected credit losses for financial assets held. This guidance will be effective for the Company in the first quarter of its fiscal year 2021 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted beginning in the first quarter of the Company’s fiscal year 2020. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under the new guidance, a lessee will be required to recognize assets and liabilities for all leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. This guidance will be effective for the Company in the first quarter of its fiscal year 2020 and early adoption is permitted. The guidance requires adoption based upon a modified retrospective transition approach. However, the FASB has recently proposed guidance that would permit companies not to restate periods priors to adoption. The Company has not yet selected a transition method, has not yet determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01). This ASU changes accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. In addition, it clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The guidance will be effective for the Company beginning in the first quarter of fiscal year 2019 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted for certain provisions. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers: Topic 606 (ASU 2014-09), to supersede nearly all existing revenue recognition guidance under GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than required under existing GAAP including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 is required to be adopted, using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU 2014-09; or (ii) retrospective with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application and providing certain additional disclosures. The guidance will be effective for the Company in the first quarter of its fiscal year 2019. The Company intends to adopt the new standard in the first quarter of fiscal year 2019 using the modified retrospective method. Based upon a preliminary assessment, the Company expects certain portions of its product revenue could be accelerated to reflect transfer of control upon delivery and an element of installation will be deferred until performed. The revenue recognition method for indirect sales and service revenues is expected to be unchanged under the new guidance. The Company also expects to capitalize incremental contract acquisition costs, such as sales commissions, and amortize over the economic life of its product or contractual relationship with the customer. The Company’s current practice is to defer sales commissions until revenue is recognized. The Company currently does not expect the application of this guidance to have a significant impact on its consolidated financial statements; however, the Company’s assessment may change as it continues its evaluation and analysis of this ASU.

Supplemental Financial Information

9 Months Ended

Mar. 31, 2018

Supplemental Financial Information Disclosure [Abstract]

Supplemental Financial Information

Note 3. Supplemental Financial Information

Balance Sheet Components

Financing receivables

A financing receivable is a contractual right to receive money, on demand or on fixed or determinable dates, that is recognized as an asset in the Company’s balance sheet. The Company’s financing receivables, consisting of its accounts receivable with contractual maturities of more than one year and sales-type leases, totaled $8.2 million and $7.4 million at March 31, 2018 and June 30, 2017, respectively, and are included in other assets in the unaudited condensed consolidated balance sheets. The Company evaluates the credit quality of an obligor at lease inception and monitors credit quality over the term of the underlying transactions. The Company performs a credit analysis for all new customers and reviews payment history, current order backlog, financial performance of the customers and other variables that augment or mitigate the inherent credit risk of a transaction. Such variables include the underlying value and liquidity of the collateral, the essential use of the equipment, the term of the lease and the inclusion of credit enhancements, such as guarantees, letters of credit or security deposits. The Company classifies accounts as high risk when it considers the financing receivable to be impaired or when management believes there is a significant near-term risk of non-payment. As of March 31, 2018, the sales-type lease portion of the financing receivables was rated at a moderate risk. The Company performed an assessment of the allowance for credit losses related to its financing receivables as of March 31, 2018 and June 30, 2017. Based upon such assessment, the Company did not record any adjustment and recorded $0.04 million to the allowance for credit losses related to such financing receivables as of March 31, 2018 and as of June 30, 2017, respectively.

A summary of the Company’s financing receivables is presented as follows (in thousands):

March 31, 2018	Lease Receivables			Financed Service Contracts and Other		Total
Gross	$	3,332		$	7,888	$	11,220
Unearned income		(301	)		—		(301	)
Allowance for credit loss		—			—		—
Total, net	$	3,031		$	7,888	$	10,919
Reported as:
Current	$	789		$	1,927		2,716
Non-current		2,242			5,961		8,203
Total, net	$	3,031		$	7,888	$	10,919

June 30, 2017	Lease Receivables			Financed Service Contracts and Other		Total
Gross	$	4,030		$	6,268	$	10,298
Unearned income		(433	)		—		(433	)
Allowance for credit loss		(39	)		—		(39	)
Total, net	$	3,558		$	6,268	$	9,826
Reported as:
Current	$	720		$	1,677	$	2,397
Non-current		2,838			4,591		7,429
Total, net	$	3,558		$	6,268	$	9,826

Actual cash collections may differ from the contracted maturities due to early customer buyouts, refinancing, or defaults. Future minimum lease payments to be received as of March 31, 2018 are presented as follows (in thousands):

Year Ending June 30,	Amount
2018 (remaining 3 months)	$	232
2019		930
2020		930
2021		930
2022		310
Total	$	3,332

Inventories

Inventories consisted of the following (in thousands):

	March 31, 2018		June 30, 2017
Raw materials	$	43,683	$	38,803
Work-in-process		18,622		15,471
Finished goods		53,595		50,780
Inventories	$	115,900	$	105,054

Property and equipment, net

Property and equipment, net consisted of the following (in thousands):

	March 31, 2018			June 30, 2017
Furniture and fixtures	$	2,961		$	4,364
Computer and office equipment		11,293			11,802
Software		11,314			11,457
Leasehold improvements		23,351			23,164
Machinery and equipment		46,904			48,742
Construction in progress		6,924			3,533
		102,747			103,062
Less: Accumulated depreciation		(78,285	)		(80,000	)
Property and equipment, net	$	24,462		$	23,062

Depreciation expense related to property and equipment for the three and nine months ended March 31, 2018 was $2.3 million and $7.3 million, respectively. Depreciation expense related to property and equipment for the three and nine months ended March 31, 2017 was $2.6 million and $7.9 million, respectively.

Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) are excluded from earnings and reported as a component of stockholders’ equity. The foreign currency translation adjustment results from those subsidiaries not using the U.S. Dollar as their functional currency since the majority of their economic activities are primarily denominated in their applicable local currency. Accordingly, all assets and liabilities related to these operations are translated to the U.S. Dollar at the current exchange rates at the end of each period. Revenues and expenses are translated at average exchange rates in effect during the period.

The components of accumulated other comprehensive income (loss) in the equity section of the balance sheets are as follows (in thousands):

	March 31, 2018			June 30, 2017
Net unrealized gain (loss) on short-term investments	$	354		$	(89	)
Cumulative foreign currency translation adjustment		2,621			1,154
Defined benefit pension obligation		(1,117	)		(1,117	)
Accumulated other comprehensive income (loss)	$	1,858		$	(52	)

Goodwill and Intangible Assets

9 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Note 4. Goodwill and Intangible Assets

Goodwill

Activity related to goodwill consisted of the following (in thousands):

	March 31, 2018		June 30, 2017
Balance at the beginning of the period	$	57,812	$	57,848
Currency translation		209		(36	)
Balance at the end of the period	$	58,021	$	57,812

In the second quarter of fiscal 2018, the Company performed its annual goodwill impairment test. Based on this analysis, the Company determined that there was no impairment to goodwill. The Company will continue to monitor its recorded goodwill for indicators of impairment.

Intangible Assets

The Company’s carrying amount of acquired intangible assets, net, is as follows (in thousands):

		March 31, 2018							June 30, 2017
	Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(in years)
Patent license	7	$	1,000	$	(143	)	$	857	$	1,000	$	(36	)	$	964

The Company did not identify any triggering events that would indicate potential impairment of its definite-lived intangible and long-lived assets as of March 31, 2018 and June 30, 2017.

Amortization expense related to intangible assets for the three and nine months ended March 31, 2018 was $0.04 million and $0.11 million, respectively. Amortization expense related to intangible assets for the three and nine months ended March 31, 2017 was $2.0 million and $6.0 million, respectively.

The estimated future amortization expense of acquired intangible assets as of March 31, 2018 is as follows (in thousands):

Year Ending June 30,	Amount
2018 (remaining 3 months)	$	36
2019		143
2020		143
2021		143
2022		143
Thereafter		249
	$	857

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Investments

9 Months Ended

Mar. 31, 2018

Investments Debt And Equity Securities [Abstract]

Investments

Note 5. Investments

The Company considers all highly liquid investments held at major banks, certificates of deposit and other securities with original maturities of three months or less to be cash equivalents.

The Company classifies all of its investments as available-for-sale at the time of purchase because management intends that these investments are available for current operations and includes these investments on its balance sheet as short-term investments. Investments with original maturities longer than three months include commercial paper, U.S. agency securities, non-U.S. government securities and investment-grade corporate debt securities. Investments classified as available-for-sale are recorded at fair market value with the related unrealized gains and losses included in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are recorded based on specific identification of each security’s cost basis.

In January 2018, the Company sold all of its available-for-sale investments for proceeds of $23.9 million and realized an insignificant loss on the sale of its investments. The Company reviews its investments quarterly to identify and evaluate investments that have an indication of possible impairment. Gross realized gains and losses were insignificant for the nine months ended March 31, 2018 and the year ended June 30, 2017. Upon the sale of its available for sale securities, the Company reclassified $77 thousand from other comprehensive income to Other expense, net.

The Company has an investment in a technology company, which has historically been accounted for using the cost method and recorded in Other assets. Subsequent to such company’s initial public offering in October 2017, the Company owns approximately 143,000 shares of such company’s common stock. These shares are subject to a 6-month lock-up period that expired in April 2018. As of March 31, 2018, these shares have a fair value of $0.9 million. Considering the recent liquidity in these shares, the Company reclassified its investment from Other assets to short-term investments, recording an unrealized gain of $0.3 million through other comprehensive income at March 31, 2018. The Company considers the tax effect on the gain to be immaterial.

The following table summarizes the available-for-sale debt securities that were in a continuous unrealized loss position, but were not deemed to be other-than-temporarily impaired (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
March 31, 2018	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
U. S. government agency securities (*)	$	—		$	—	$	—		$	—	$	—		$	—
June 30, 2017
U. S. government agency securities	$	(31	)	$	11,970	$	(58	)	$	11,939	$	(89	)	$	23,909

(*)	There was no positions as of March 31, 2018

Derivative Financial Instruments

9 Months Ended

Mar. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 6. Derivative Financial Instruments

The Company manages some of its foreign currency risk through the purchase of foreign currency forward contracts that hedge against the short-term effect of currency fluctuations. These foreign currency forward contracts have a monthly maturity that mitigates the effect of rate fluctuations on certain local currency denominated intercompany balances, cash, and customer receivables. The Company does not use derivative financial instruments for speculative or trading purposes. These forward contracts are not designated as hedging instruments for accounting purposes. Principal hedged currencies include the Euro, Japanese Yen, Swiss Franc, and U.S. Dollar. There were no outstanding foreign currency forward contracts at the end of March 31, 2018 and June 30, 2017.

The following table provides information about gains (losses) associated with the Company’s derivative financial instruments (in thousands):

	Three Months Ended March 31,						Nine Months Ended March 31,
	2018			2017			2018			2017
Foreign currency exchange gain (loss) on foreign contracts	$	726		$	225		$	(1,712	)	$	(942	)
Foreign currency transactions gain (loss)		(1,047	)		(44	)		1,477			40

Fair Value Measurements

9 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 7. Fair Value Measurements

Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy contains three levels of inputs that may be used to measure fair value, as follows:

Level 1— Unadjusted quoted prices that are available in active markets for the identical assets or liabilities at the measurement date.

Level 2— Other observable inputs available at the measurement date, other than quoted prices included in Level 1, either directly or indirectly, including:

•

Quoted prices for similar assets or liabilities in active markets;

•

Quoted prices for identical or similar assets in non-active markets;

•

Inputs other than quoted prices that are observable for the asset or liability; and

•

Inputs that are derived principally from or corroborated by other observable market data.

Level 3— Unobservable inputs that cannot be corroborated by observable market data and require the use of significant management judgment. These values are generally determined using pricing models for which the assumptions utilize management’s estimates of market participant assumptions.

The Company’s Level 1 assets include institutional money-market funds that are classified as cash equivalents, which are valued primarily using quoted market prices in active markets for identical assets. The Company’s Level 2 assets include its U.S. government agency securities and its corporate securities as the market inputs used to value these instruments consist of market yields, reported trades and broker/dealer quotes, which are corroborated with observable market data. The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value (in thousands):

	March 31, 2018
							Estimated Fair Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Cash and Cash Equivalents		Short-term Investments
Cash	$	70,392	$	—	$	—	$	70,392	$	—
Level 2
Corporate securities		533		355						888
Total	$	70,925	$	355	$	—	$	70,392	$	888

	June 30, 2017
								Estimated Fair Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Cash and Cash Equivalents		Short-term Investments
Cash	$	70,515	$	—	$	—		$	70,515	$	—
Level 1
Money market funds		1,569		—		—			1,569		—
Level 2
U.S. government agency securities		23,998		—		(89	)		—		23,909
Total	$	96,082	$	—	$	(89	)	$	72,084	$	23,909

Liabilities That Are Measured at Fair Value on a Nonrecurring Basis

The Company’s debt is measured on a non-recurring basis using Level 2 inputs based upon observable inputs of the Company’s underlying stock price and the time value of the conversion option, since an observable quoted price of the 3.50% Convertible Notes (as defined below), the 3.50% Series A Convertible Notes (as defined below) and the 3.75% Convertible Notes (as defined below) (collectively the “Notes”) are not readily available. The carrying value of the Revolving Credit Facility (as defined below) and the Term Loan (as defined below) (collectively the “Credit Facilities”, together with the Notes, “Debt”) approximate its estimated fair value as these borrowings have a variable rate structure that is based on a market observable interest rate that resets periodically. The Credit Facilities are classified as Level 2 within the fair value hierarchy.

The following table summarizes the carrying value and estimated fair value of all Debt (in thousands):

	March 31, 2018				June 30, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.50% Convertible Notes	$	—	$	—	$	44,099	$	48,146
3.50% Series A Convertible Notes		—		—		68,924		74,982
3.75% Convertible Notes		68,598		96,900		—		—
Revolving Credit Facility		28,007		28,007		51,548		51,548
Term Loan		37,716		37,716		—		—
Total	$	134,321	$	162,623	$	164,571	$	174,676

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies Litigation From time to time, the Company is involved in legal proceedings arising in the ordinary course of its business. The Company records a provision for a loss when it believes that it is both probable that a loss has been incurred and the amount can be reasonably estimated. Currently, management believes the Company does not have any probable and estimable losses related to legal proceedings and claims. Although occasional adverse decisions or settlements may occur, management does not believe that an adverse determination with respect to any of these claims would individually or in the aggregate materially and adversely affect the Company’s financial condition or operating results. Litigation is inherently unpredictable and is subject to significant uncertainties, some of which are beyond the Company’s control. Should any of these estimates and assumptions change or prove to have been incorrect, the Company could incur significant charges related to legal matters that could have a material impact on its results of operations, financial position and cash flows. Software License Indemnity Under the terms of the Company’s software license agreements with its customers, the Company agrees that in the event the software sold infringes upon any patent, copyright, trademark, or any other proprietary right of a third-party, it will indemnify its customer licensees against any loss, expense, or liability from any damages that may be awarded against them. The Company includes this infringement indemnification in all of its software license agreements and selected managed services arrangements. In the event the customer cannot use the software or service due to infringement and the Company cannot obtain the right to use, replace or modify the license or service in a commercially feasible manner so that it no longer infringes, then the Company may terminate the license and provide the customer a refund of the fees paid by the customer for the infringing license or service. The Company has not recorded any liability associated with this indemnification, as it is not aware of any pending or threatened actions that represent probable losses as of March 31, 2018.

Debt

9 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Note 9. Debt

3.50% Convertible Senior Notes due February 2018

In February 2013, the Company issued 3.50% Convertible Senior Notes due 2018 (the “3.50% Convertible Notes”) under an indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee. Holders of the 3.50% Convertible Notes were entitled to convert their notes at any time until the close of the business day immediately preceding the maturity date of February 1, 2018. The 3.50% Convertible Notes were convertible into common stock of the Company at an initial conversion rate equal to 187.6877 shares of common stock per $1,000 principal amount, which is equivalent to a conversion price of approximately $5.33 per share of common stock, subject to adjustment.

On January 30, 2018, the Company entered into exchange agreements (the “Exchange Agreements”) with the holders of the 3.50% Convertible Notes, which amended the original settlement terms of the notes and allowed the Company to settle the then outstanding $13.0 million principal balance of the 3.50% Convertible Notes and accrued interest in cash at maturity, and any excess equity value over the original conversion price in shares. In exchange for the agreement to settle in cash, the Company agreed to pay $0.3 million exchange premium . The $0.3 million exchange premium was accounted for as debt extinguishment and included in Other expense, net.

On February 1, 2018, pursuant to the Exchange Agreements, the Company paid $13.2 million in cash to settle outstanding principal and accrued interest, and on February 7, 2018 issued 253,000 shares of the Company’s common stock to the 3.50% Convertible Notes holders. The total number of shares was determined using a three-day volume weighted averaging price period and based on a prescribed formula in the Exchange Agreements. As a result, the 3.50% Convertible Notes were repaid in full and were not outstanding at March 31, 2018.

3.50% Series A Convertible Senior Notes due February 2018

In April 2014, the Company issued 3.50% Series A Convertible Senior Notes due 2018 (the “3.50% Series A Convertible Notes”) under an indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee. Holders of the 3.50% Series A Convertible Notes were entitled to convert their notes at any time on or after November 1, 2017 until the close of business on the business day immediately preceding the maturity date of February 1, 2018. The initial conversion rate is 187.6877 shares of the Company’s common stock per $1,000 principal amount, which represents an initial conversion price of approximately $5.33 per share of the Company’s common stock.

Pursuant to the original settlement terms, the Company made an irrevocable net share settlement election and paid cash for principal plus accrued interest upon maturity to holders who did not elect to convert. Prior to maturity, one note holder elected to convert their notes and receive a combination of cash and shares at settlement. The number of shares was determined based on a prescribed formula in the indenture. On February 1, 2018, the Company paid an aggregate amount of $27.0 million in cash and delivered 1,252 shares of its common stock to settle the 3.50% Series A Convertible Notes. As a result, the 3.50% Series A Convertible Notes were repaid in full and were not outstanding at March 31, 2018.

3.75% Convertible Senior Notes due July 2022

In August 2017, the Company issued $85.0 million aggregate principal amount of its 3.75% Convertible Senior Notes due 2022 (the “3.75% Convertible Notes”) under an indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee. $53.0 million aggregate principal amount of the 3.75% Convertible Notes were issued to certain holders of the Company’s outstanding 3.50% Convertible Notes and 3.50% Series A Convertible Notes (together, the “Existing Notes”) in exchange for approximately $47.0 million aggregate principal amount of the Existing Notes (the “Exchange”) and $32.0 million aggregate principal amount of the 3.75% Convertible Notes were issued to certain other qualified new investors for cash. The net proceeds of the cash issuance were used to repurchase approximately $28.0 million of Existing Notes (the “Repurchase”).

Holders of the 3.75% Convertible Notes may convert their notes at any time on or after April 15, 2022 until the close of the business day immediately preceding the maturity date. Prior to April 15, 2022, holders of the 3.75% Convertible Notes may convert their notes only under certain circumstances

Upon conversion, the Company will have the right to pay cash, or deliver shares of common stock of the Company or a combination thereof, at the Company’s election. The initial conversion rate is 174.8252 shares of the Company’s common stock per $1,000 principal amount (which represents an initial conversion price of approximately $5.72 per share of the Company’s common stock). The conversion rate, and thus the conversion price, is subject to adjustment as further described below.

Holders of the 3.75% Convertible Notes who convert their notes in connection with a “make-whole fundamental change,” as defined in the indenture, may be entitled to a make-whole premium in the form of an increase in the conversion rate. Additionally, in the event of a “fundamental change,” as defined in the indenture, holders of the 3.75% Convertible Notes may require the Company to purchase all or a portion of their note at a fundamental change repurchase price equal to 100% of the principal amount of the 3.75% Convertible Notes, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. As of March 31, 2018, approximately $85.0 million aggregate principal amount was outstanding.

Revolving Credit Facility

On June 14, 2017, the Company entered into a credit and security agreement with a lender (the “Credit Agreement”). The Credit Agreement provides the Company with a revolving credit facility in the initial amount of $52.0 million (the “Revolving Credit Facility”). Availability for borrowings under the Revolving Credit Facility is subject to a borrowing base that is calculated as a function of the value of the Company’s eligible accounts receivable and eligible inventory, and the Company is required to maintain a minimum drawn balance of at least 30% of such availability. Interest on the borrowings under the Revolving Credit Facility is payable monthly in arrears at an annual interest rate of reserve-adjusted, 90-day LIBOR plus 4.50% and had initial maturity date of June 14, 2021.

In December 2017, concurrently with the Term Loan Agreement described below, the Company entered into an amendment to the Credit Agreement (the “Amendment” and, collectively with the Credit Agreement, the “Amended Credit Agreement”). The Amendment reduced the maximum borrowings under the Revolving Credit Facility to $32.0 million and extended the maturity date of the Revolving Credit Facility to December 15, 2022.

The Amended Credit Agreement contains restrictions and covenants applicable to the Company. Among other requirements, the Company may not permit the Fixed Charge Coverage Ratio (as defined in the Amended Credit Agreement) to be less than a certain specified ratio for each fiscal quarter during the term of the Revolving Credit Facility. In addition, the Amended Credit Agreement contains customary restrictive covenants that limit, among other things, the ability of the Company and its subsidiaries to (i) incur additional indebtedness, (ii) incur liens on their property, (iii) pay dividends or make other distributions, (iv) sell their assets, (v) make certain loans or investments, (vi) merge or consolidate, (vii) voluntarily repay or prepay certain indebtedness and (viii) enter into transactions with affiliates, in each case subject to certain exceptions. The Company was in compliance with the covenants as of March 31, 2018. As of March 31, 2018, approximately $28.0 million aggregate principal amount was outstanding under the Revolving Credit Facility.

Term Loan

In December 2017, the Company entered into a credit and security agreement with a lender (the “Term Loan Agreement”). The Term Loan Agreement provides for an initial term loan of $40.0 million with an additional tranche of $20.0 million available through December 31, 2018, if specified conditions are met (the “Term Loan”). In connection with the Amendment, the Company used a portion of the net proceeds from the initial advance to repay a portion of the outstanding borrowings under the Revolving Credit Facility. Interest on the Term Loan is payable monthly in arrears at an annual interest rate of 6.75% plus 90-day LIBOR. The Term Loan Agreement matures December 15, 2022 and, if prepaid, has fees equal to 3%, 2%, and 1% of the prepayment amount if such termination occurs within the first year, the second year, and the third year of funding, respectively. The term of the loan is 60 months with interest only for the first 24 months followed by straight-line amortization of principal for the remaining months. In addition, the Company will pay an annual administrative fee of 0.25% and a final payment of 4.0% of the Term Loan amount. As of March 31, 2018, approximately $40.0 million aggregate principal amount was outstanding.

The following table presents the carrying value of all Debt (in thousands):

As of March 31, 2018	Revolving Credit Facility		3.75% Convertible Notes			Term Loan Facility			Total
Carrying amount of equity conversion component	$	—	$	14,650		$	—		$	14,650
Principal amount of the Notes	$	28,007	$	85,000		$	40,000		$	153,007
Unamortized debt costs		—		(3,501	)		(1,862	)	$	(5,363	)
Unamortized debt discount		—		(12,901	)		(422	)	$	(13,323	)
Net carrying amount	$	28,007	$	68,598		$	37,716		$	134,321
Reported as:
Short-term debt									$	—
Long-term debt										134,321
Total debt									$	134,321

As of June 30, 2017	Revolving Credit Facility		3.50% Convertible Notes			3.50% Series A Convertible Notes			Total
Carrying amount of equity conversion component	$	—	$	—		$	7,844		$	7,844
Principal amount of the Notes	$	51,548	$	44,654		$	70,346		$	166,548
Unamortized debt costs		—		(555	)		—			(555	)
Unamortized debt discount		—		—			(1,422	)		(1,422	)
Net carrying amount	$	51,548	$	44,099		$	68,924		$	164,571
Reported as:
Short-term debt									$	113,023
Long-term debt										51,548
Total debt									$	164,571

A summary of interest expense on the Debt is as follows (in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
	2018		2017		2018		2017
Interest expense related to contractual interest coupon	$	2,608	$	2,255	$	7,444	$	7,125
Interest expense related to amortization of debt discount		862		661		2,589		2,117
Interest expense related to amortization of debt issuance costs		391		383		1,259		1,165
	$	3,861	$	3,299	$	11,292	$	10,407

Share-Based Compensation

9 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

Note 10. Share-Based Compensation

The following table presents details of share-based compensation expenses by functional line item (in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
	2018		2017		2018		2017
Cost of revenue	$	442	$	519	$	1,410	$	1,461
Research and development		577		644		1,842		1,808
Selling and marketing		496		769		863		2,077
General and administrative		1,689		1,666		4,959		4,639
	$	3,204	$	3,598	$	9,074	$	9,985

Net Loss Per Common Share

9 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Loss Per Common Share

Note 11. Net Loss Per Common Share

The Company reports both basic and diluted loss per share, which is based on the weighted average number of common shares outstanding during the period.

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per common share follows (in thousands):

	Three Months Ended March 31,						Nine Months Ended March 31,
	2018			2017			2018			2017
Numerator:
Net loss used to compute basic and diluted loss per share	$	(8,852	)	$	(5,029	)	$	(22,953	)	$	(24,324	)
Denominator:
Weighted average shares used to compute basic and diluted loss per share		85,459			82,913			84,594			82,268

The potentially dilutive shares of the Company’s common stock resulting from the assumed exercise of outstanding stock options, the settlement of vested Restricted Stock Units (RSU), Market Stock Units (MSU) and Performance Stock Units (PSU), and the purchase of shares under the Company’s Employee Stock Purchase Program (ESPP), as determined under the treasury stock method, are excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive. Additionally, the 3.50% Convertible Notes are included in the calculation of diluted net income per share only if their inclusion is dilutive.

The following table sets forth all potentially dilutive securities excluded from the computation in the table above because their effect would have been anti-dilutive (in thousands):

	As of March 31,
	2018		2017
Stock options		2,672		2,510
RSUs, PSUs and MSUs		5,202		5,492
3.50% Convertible Notes		—		8,378
		7,874		16,380

3.75% Convertible Notes—Diluted Share Impact

The 3.75% Convertible Notes and the 3.50% Series A Convertible Notes have an optional physical (share), cash or combination settlement feature and contain certain conditional conversion features. The 3.50% Series A Convertible Notes were retired in February 2018. Due to the optional cash settlement feature and management’s intent to settle the principal amount thereof in cash, the shares of our common stock issuable upon conversion of the outstanding principal amount of the 3.75% Convertible Notes as of March 31, 2018, totaling approximately 14.9 million shares of our common stock, were not included in the basic and diluted net loss per common share table above.

Segment Information

9 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Note 12. Segment Information

The Company operates in one reportable segment (oncology systems group), which develops, manufactures and markets proprietary medical devices used in radiation therapy and radiosurgery for the treatment of cancer patients. The Company’s Chief Executive Officer, its Chief Operating Decision Maker, reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance. The Company does not assess the performance of its individual product lines on measures of profit or loss, or asset-based metrics.

The following tables present net revenue and long-lived asset information based on geographic region. Net revenue is based on the destination of the shipments and long-lived assets are based on the physical location of the assets (in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
Net Revenue	2018		2017		2018		2017
Americas	$	41,767	$	38,720	$	115,544	$	118,545
Europe, Middle East, India and Africa		14,731		21,785		81,885		68,705
Asia-Pacific and Japan		43,334		36,807		93,682		84,070
Total	$	99,832	$	97,312	$	291,111	$	271,320

	March 31,		June 30,
Property and equipment, net	2018		2017
Americas	$	19,958	$	18,435
Europe, Middle East, India and Africa		665		730
Asia-Pacific and Japan		3,839		3,897
Total	$	24,462	$	23,062

Income Tax	9 Months Ended
Income Tax	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax	Note 13. Income Tax On a quarterly basis, the Company provides for income taxes based upon an estimated annual effective income tax rate. The Company recognized an income tax expense of $0.6 million and $1.3 million for the three and nine months ended March 31, 2018, respectively. The Company recognized an income tax expense of $0.8 million and $0.6 million for the three and nine months ended March 31, 2017, respectively. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Act”) was signed into law. The Company believes the impact of the inclusion of accumulated post-1986 foreign earnings on which U.S. income tax is currently deferred to a one-time transition tax on March 31, 2018 would not be material to the Company. The measurement of the transition tax liability requires extensive effort to calculate foreign earnings and profit on a cumulative basis. The Company has made reasonable efforts to determine that there would be no material financial impact from this one-time transition tax as the Company believes its existing tax attributes can be used to offset the transition tax without limitation, but an election is available to not claim the net operating loss deduction against the mandatory foreign earnings inclusion at March 31, 2018. Under ASC 740, Accounting for Income Taxes, the enactment of the Tax Act also requires companies, to recognize the effects of changes in tax laws and rates on deferred tax assets and liabilities and the retroactive effects of changes in tax laws in the period in which the new legislation is enacted. There is no further change to its assertion on maintaining a full valuation allowance against its U.S. deferred tax assets. The Company’s gross deferred tax assets will be revalued from 35% to 21% with a corresponding offset to the valuation allowance and any potential other taxes arising due to the Tax Act will result in reductions to its net operating loss carryforward and valuation allowance. Deferred tax assets of approximately $174.0 million will be revalued to approximately $117.0 million with a corresponding decrease to the Company’s valuation allowance. The Company will continue to analyze the Tax Act to assess the full effects on its financial results, including disclosures, for its fiscal year ending June 30, 2018. In accordance with Staff Accounting Bulletin (SAB) No. 118 - Income Tax Accounting Implications of the Tax Cuts and Jobs Act, the effects of the Tax Act may be adjusted within a one-year measurement period from the enactment date for items that were previously reported as provisional, or where a provisional estimate could not be made. Income tax provision for the three months ended March 31, 2018, did not reflect any adjustment to the previously assessed Tax Act enactment effect. The Company will continue to assess forthcoming guidance and accounting interpretations on the effects of the Tax Act and expects to complete its analysis within the measurement period in accordance with the guidance provided in SAB No. 118.

The Company and its Significant Accounting Policies (Policies)	9 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant inter-company transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures have been condensed or omitted pursuant to such rules and regulations. The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of the periods presented. Certain amounts in the prior year’s condensed consolidated balance sheet and condensed consolidated statement of cash flows have been reclassified to conform to the current period’s presentation. The results for the three and nine months ended March 31, 2018 are not necessarily indicative of the results to be expected for the fiscal year ending June 30, 2018, or for any other future interim period or fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes for the fiscal year ended June 30, 2017 included in the Company’s Annual Report on Form 10-K filed with the SEC on August 25, 2017.
Significant Accounting Policies	Significant Accounting Policies There have been no material changes to the Company’s accounting policies from the information provided in Note 2. Summary of Significant Accounting Policies to the audited condensed consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2017.

Recent Accounting Pronouncements (Policies)	9 Months Ended
Recent Accounting Pronouncements (Policies)	Mar. 31, 2018
Accounting Pronouncement Recently Adopted
Accounting Pronouncements	Accounting Pronouncement Recently Adopted In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718). The new guidance simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. In addition, the guidance provides an option to recognize forfeitures as they occur versus estimating them at the time of grant. The amendments in this standard are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company adopted ASU No. 2016-09 as required in the first quarter of fiscal year 2018 and has elected to continue the use of its forfeiture estimation method for share-based payment awards. The adoption of ASU 2016-09 did not have a material impact on the Company’s consolidated financial statements and related disclosures.
Accounting Pronouncements Not Yet Effective
Accounting Pronouncements	Accounting Pronouncements Not Yet Effective In February 2018, the FASB issued ASU No. 2018-2, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that allows companies to reclassify from Accumulated Other Comprehensive Income to Retained Earnings stranded tax effects resulting from the enactment of the Tax Cuts and Jobs Act (the "Tax Act"). The guidance will be effective for the Company in its first quarter of fiscal year 2020. Early adoption is permitted. The guidance should be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. The Company has not yet selected a transition method, has not yet determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging. This guidance simplifies the application and administration of hedge accounting. The guidance amends the presentation and disclosure requirements and changes how companies assess effectiveness. The guidance is intended to more closely align hedge accounting with companies' risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The guidance will be effective for the Company in its first quarter of fiscal year 2020. Early adoption is permitted. The guidance is required to be adopted on a prospective basis. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718)—Scope of Modification Accounting. This guidance redefines which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting for a share-based payment. This guidance will be effective for the Company in the first quarter of its fiscal year 2019. The guidance is required to be adopted on a prospective basis. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In March 2017, the FASB issued ASU No. 2017-07, Compensation—Retirement Benefits (Topic 715)—Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This guidance revises the presentation of employer-sponsored defined benefit pension and other postretirement plans for the net periodic benefit cost in the statement of operations and requires that the service cost component of net periodic benefit be presented in the same income statement line items as other employee compensation costs for services rendered during the period. The other components of the net benefit costs are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of income from operations. This guidance allows only the service cost component of net periodic benefit costs to be eligible for capitalization. The guidance will be effective for the Company in the first quarter of its fiscal year 2019 and is required to be adopted on a retrospective basis. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other Topics (Topic 350)-Simplifying the Test for Goodwill Impairment. This guidance simplifies the measurement of goodwill by eliminating the Step 2 impairment test. The new guidance requires companies to perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. This guidance will be effective for the Company beginning in its first quarter of fiscal year 2021. The amendment is required to be adopted prospectively. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This guidance will be effective for the Company in the first quarter of its fiscal year 2019. The guidance is required to be adopted on a retrospective basis, unless it is impracticable whereby the guidance can be adopted on a prospective basis as of the earliest date practicable. The Company does not believe the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU No. 2016-13 Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 requires measurement and recognition of expected credit losses for financial assets held. This guidance will be effective for the Company in the first quarter of its fiscal year 2021 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted beginning in the first quarter of the Company’s fiscal year 2020. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under the new guidance, a lessee will be required to recognize assets and liabilities for all leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. This guidance will be effective for the Company in the first quarter of its fiscal year 2020 and early adoption is permitted. The guidance requires adoption based upon a modified retrospective transition approach. However, the FASB has recently proposed guidance that would permit companies not to restate periods priors to adoption. The Company has not yet selected a transition method, has not yet determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01). This ASU changes accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. In addition, it clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The guidance will be effective for the Company beginning in the first quarter of fiscal year 2019 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted for certain provisions. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers: Topic 606 (ASU 2014-09), to supersede nearly all existing revenue recognition guidance under GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than required under existing GAAP including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 is required to be adopted, using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU 2014-09; or (ii) retrospective with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application and providing certain additional disclosures. The guidance will be effective for the Company in the first quarter of its fiscal year 2019. The Company intends to adopt the new standard in the first quarter of fiscal year 2019 using the modified retrospective method. Based upon a preliminary assessment, the Company expects certain portions of its product revenue could be accelerated to reflect transfer of control upon delivery and an element of installation will be deferred until performed. The revenue recognition method for indirect sales and service revenues is expected to be unchanged under the new guidance. The Company also expects to capitalize incremental contract acquisition costs, such as sales commissions, and amortize over the economic life of its product or contractual relationship with the customer. The Company’s current practice is to defer sales commissions until revenue is recognized. The Company currently does not expect the application of this guidance to have a significant impact on its consolidated financial statements; however, the Company’s assessment may change as it continues its evaluation and analysis of this ASU.

Supplemental Financial Information (Tables)

9 Months Ended

Mar. 31, 2018

Supplemental Financial Information Disclosure [Abstract]

Schedule of financing receivables

A summary of the Company’s financing receivables is presented as follows (in thousands):

March 31, 2018	Lease Receivables			Financed Service Contracts and Other		Total
Gross	$	3,332		$	7,888	$	11,220
Unearned income		(301	)		—		(301	)
Allowance for credit loss		—			—		—
Total, net	$	3,031		$	7,888	$	10,919
Reported as:
Current	$	789		$	1,927		2,716
Non-current		2,242			5,961		8,203
Total, net	$	3,031		$	7,888	$	10,919

June 30, 2017	Lease Receivables			Financed Service Contracts and Other		Total
Gross	$	4,030		$	6,268	$	10,298
Unearned income		(433	)		—		(433	)
Allowance for credit loss		(39	)		—		(39	)
Total, net	$	3,558		$	6,268	$	9,826
Reported as:
Current	$	720		$	1,677	$	2,397
Non-current		2,838			4,591		7,429
Total, net	$	3,558		$	6,268	$	9,826

Schedule of future minimum lease payments receivable

Future minimum lease payments to be received as of March 31, 2018 are presented as follows (in thousands):

Year Ending June 30,	Amount
2018 (remaining 3 months)	$	232
2019		930
2020		930
2021		930
2022		310
Total	$	3,332

Schedule of inventories

Inventories consisted of the following (in thousands):

	March 31, 2018		June 30, 2017
Raw materials	$	43,683	$	38,803
Work-in-process		18,622		15,471
Finished goods		53,595		50,780
Inventories	$	115,900	$	105,054

Schedule of property and equipment, net

Property and equipment, net consisted of the following (in thousands):

	March 31, 2018			June 30, 2017
Furniture and fixtures	$	2,961		$	4,364
Computer and office equipment		11,293			11,802
Software		11,314			11,457
Leasehold improvements		23,351			23,164
Machinery and equipment		46,904			48,742
Construction in progress		6,924			3,533
		102,747			103,062
Less: Accumulated depreciation		(78,285	)		(80,000	)
Property and equipment, net	$	24,462		$	23,062

Schedule of accumulated other comprehensive income (loss) in the equity section

The components of accumulated other comprehensive income (loss) in the equity section of the balance sheets are as follows (in thousands):

	March 31, 2018			June 30, 2017
Net unrealized gain (loss) on short-term investments	$	354		$	(89	)
Cumulative foreign currency translation adjustment		2,621			1,154
Defined benefit pension obligation		(1,117	)		(1,117	)
Accumulated other comprehensive income (loss)	$	1,858		$	(52	)

Goodwill and Intangible Assets (Tables)

9 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of goodwill

Activity related to goodwill consisted of the following (in thousands):

	March 31, 2018		June 30, 2017
Balance at the beginning of the period	$	57,812	$	57,848
Currency translation		209		(36	)
Balance at the end of the period	$	58,021	$	57,812

Schedule of carrying amount of acquired intangible assets, net

The Company’s carrying amount of acquired intangible assets, net, is as follows (in thousands):

		March 31, 2018							June 30, 2017
	Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(in years)
Patent license	7	$	1,000	$	(143	)	$	857	$	1,000	$	(36	)	$	964

Schedule of estimated future amortization expense of acquired intangible assets

The estimated future amortization expense of acquired intangible assets as of March 31, 2018 is as follows (in thousands):

Year Ending June 30,	Amount
2018 (remaining 3 months)	$	36
2019		143
2020		143
2021		143
2022		143
Thereafter		249
	$	857

Investments (Tables)

9 Months Ended

Mar. 31, 2018

Investments Debt And Equity Securities [Abstract]

Schedule of available-for-sale debt securities that were in a continuous unrealized loss position

The following table summarizes the available-for-sale debt securities that were in a continuous unrealized loss position, but were not deemed to be other-than-temporarily impaired (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
March 31, 2018	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
U. S. government agency securities (*)	$	—		$	—	$	—		$	—	$	—		$	—
June 30, 2017
U. S. government agency securities	$	(31	)	$	11,970	$	(58	)	$	11,939	$	(89	)	$	23,909

(*)	There was no positions as of March 31, 2018

Derivative Financial Instruments (Tables)

9 Months Ended

Mar. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of gains (losses) associated with the Company's derivative financial instruments

The following table provides information about gains (losses) associated with the Company’s derivative financial instruments (in thousands):

	Three Months Ended March 31,						Nine Months Ended March 31,
	2018			2017			2018			2017
Foreign currency exchange gain (loss) on foreign contracts	$	726		$	225		$	(1,712	)	$	(942	)
Foreign currency transactions gain (loss)		(1,047	)		(44	)		1,477			40

Fair Value Measurements (Tables)

9 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Summary of financial assets that were accounted for at fair value

The tables below set forth, by level, the Company’s financial assets that were accounted for at fair value (in thousands):

	March 31, 2018
							Estimated Fair Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Cash and Cash Equivalents		Short-term Investments
Cash	$	70,392	$	—	$	—	$	70,392	$	—
Level 2
Corporate securities		533		355						888
Total	$	70,925	$	355	$	—	$	70,392	$	888

	June 30, 2017
								Estimated Fair Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Cash and Cash Equivalents		Short-term Investments
Cash	$	70,515	$	—	$	—		$	70,515	$	—
Level 1
Money market funds		1,569		—		—			1,569		—
Level 2
U.S. government agency securities		23,998		—		(89	)		—		23,909
Total	$	96,082	$	—	$	(89	)	$	72,084	$	23,909

Summary of carrying values and estimated fair values of short-term and long-term debt

The following table summarizes the carrying value and estimated fair value of all Debt (in thousands):

	March 31, 2018				June 30, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.50% Convertible Notes	$	—	$	—	$	44,099	$	48,146
3.50% Series A Convertible Notes		—		—		68,924		74,982
3.75% Convertible Notes		68,598		96,900		—		—
Revolving Credit Facility		28,007		28,007		51,548		51,548
Term Loan		37,716		37,716		—		—
Total	$	134,321	$	162,623	$	164,571	$	174,676

Debt (Tables)

9 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of carrying values of all Debt

The following table presents the carrying value of all Debt (in thousands):

As of March 31, 2018	Revolving Credit Facility		3.75% Convertible Notes			Term Loan Facility			Total
Carrying amount of equity conversion component	$	—	$	14,650		$	—		$	14,650
Principal amount of the Notes	$	28,007	$	85,000		$	40,000		$	153,007
Unamortized debt costs		—		(3,501	)		(1,862	)	$	(5,363	)
Unamortized debt discount		—		(12,901	)		(422	)	$	(13,323	)
Net carrying amount	$	28,007	$	68,598		$	37,716		$	134,321
Reported as:
Short-term debt									$	—
Long-term debt										134,321
Total debt									$	134,321

As of June 30, 2017	Revolving Credit Facility		3.50% Convertible Notes			3.50% Series A Convertible Notes			Total
Carrying amount of equity conversion component	$	—	$	—		$	7,844		$	7,844
Principal amount of the Notes	$	51,548	$	44,654		$	70,346		$	166,548
Unamortized debt costs		—		(555	)		—			(555	)
Unamortized debt discount		—		—			(1,422	)		(1,422	)
Net carrying amount	$	51,548	$	44,099		$	68,924		$	164,571
Reported as:
Short-term debt									$	113,023
Long-term debt										51,548
Total debt									$	164,571

Summary of interest expense on all Convertible Debt

A summary of interest expense on the Debt is as follows (in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
	2018		2017		2018		2017
Interest expense related to contractual interest coupon	$	2,608	$	2,255	$	7,444	$	7,125
Interest expense related to amortization of debt discount		862		661		2,589		2,117
Interest expense related to amortization of debt issuance costs		391		383		1,259		1,165
	$	3,861	$	3,299	$	11,292	$	10,407

Share-Based Compensation (Tables)

9 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of share-based compensation expenses by functional line item

The following table presents details of share-based compensation expenses by functional line item (in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
	2018		2017		2018		2017
Cost of revenue	$	442	$	519	$	1,410	$	1,461
Research and development		577		644		1,842		1,808
Selling and marketing		496		769		863		2,077
General and administrative		1,689		1,666		4,959		4,639
	$	3,204	$	3,598	$	9,074	$	9,985

Net Loss Per Common Share (Tables)

9 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per common share

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per common share follows (in thousands):

	Three Months Ended March 31,						Nine Months Ended March 31,
	2018			2017			2018			2017
Numerator:
Net loss used to compute basic and diluted loss per share	$	(8,852	)	$	(5,029	)	$	(22,953	)	$	(24,324	)
Denominator:
Weighted average shares used to compute basic and diluted loss per share		85,459			82,913			84,594			82,268

Schedule of all potentially dilutive securities excluded from the computation of basic and diluted net income (loss) per common share

The following table sets forth all potentially dilutive securities excluded from the computation in the table above because their effect would have been anti-dilutive (in thousands):

	As of March 31,
	2018		2017
Stock options		2,672		2,510
RSUs, PSUs and MSUs		5,202		5,492
3.50% Convertible Notes		—		8,378
		7,874		16,380

Segment Information (Tables)

9 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Summary of Revenue by Geographic Region

The following tables present net revenue and long-lived asset information based on geographic region.

(in thousands):

	Three Months Ended March 31,				Nine Months Ended March 31,
Net Revenue	2018		2017		2018		2017
Americas	$	41,767	$	38,720	$	115,544	$	118,545
Europe, Middle East, India and Africa		14,731		21,785		81,885		68,705
Asia-Pacific and Japan		43,334		36,807		93,682		84,070
Total	$	99,832	$	97,312	$	291,111	$	271,320

Schedule of Geographic Areas in Which the Company has Long Lived Tangible Assets

Net revenue is based on the destination of the shipments and long-lived assets are based on the physical location of the assets (in thousands):

	March 31,		June 30,
Property and equipment, net	2018		2017
Americas	$	19,958	$	18,435
Europe, Middle East, India and Africa		665		730
Asia-Pacific and Japan		3,839		3,897
Total	$	24,462	$	23,062

Supplemental Financial Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Financing receivables
Accounts receivable with contractual maturities and sales-type leases	$ 8,203		$ 8,203		$ 7,429
Allowance for credit loss	0		0		$ (39)
Property and equipment, net
Depreciation expense	$ 2,300	$ 2,600	$ 7,300	$ 7,900

Supplemental Financial Information - Summary of Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financing receivables
Gross	$ 11,220	$ 10,298
Unearned income	(301)	(433)
Allowance for credit loss	0	(39)
Total, net	10,919	9,826
Current	2,716	2,397
Non-current	8,203	7,429
Lease Receivables
Financing receivables
Gross	3,332	4,030
Unearned income	(301)	(433)
Allowance for credit loss		(39)
Total, net	3,031	3,558
Current	789	720
Non-current	2,242	2,838
Financed Service Contracts and Other
Financing receivables
Gross	7,888	6,268
Total, net	7,888	6,268
Current	1,927	1,677
Non-current	$ 5,961	$ 4,591

Supplemental Financial Information - Summary of Future Minimum Lease Payments Receivable (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Capital leases future minimum payments receivable
2018 (remaining 3 months)	$ 232
2019	930
2020	930
2021	930
2022	310
Total	$ 3,332

Supplemental Financial Information - Summary of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Inventories
Raw materials	$ 43,683	$ 38,803
Work-in-process	18,622	15,471
Finished goods	53,595	50,780
Inventories	$ 115,900	$ 105,054

Supplemental Financial Information - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Property and equipment, net
Property and equipment, gross	$ 102,747	$ 103,062
Less: Accumulated depreciation	(78,285)	(80,000)
Property and equipment, net	24,462	23,062
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	2,961	4,364
Computer and office equipment
Property and equipment, net
Property and equipment, gross	11,293	11,802
Software
Property and equipment, net
Property and equipment, gross	11,314	11,457
Leasehold improvements
Property and equipment, net
Property and equipment, gross	23,351	23,164
Machinery and equipment
Property and equipment, net
Property and equipment, gross	46,904	48,742
Construction in progress
Property and equipment, net
Property and equipment, gross	$ 6,924	$ 3,533

Supplemental Financial Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss)
Net unrealized gain (loss) on short-term investments	$ 354	$ (89)
Cumulative foreign currency translation adjustment	2,621	1,154
Defined benefit pension obligation	(1,117)	(1,117)
Accumulated other comprehensive income (loss)	$ 1,858	$ (52)

Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 57,812	$ 57,848
Currency translation	209	(36)
Balance at the end of the period	$ 58,021	$ 57,812

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of goodwill		$ 0
Amortization expense	$ 40		$ 2,000	$ 110	$ 6,000

Goodwill and Intangible Assets - Schedule of Carrying Amount of Acquired Intangible Assets, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Finite Lived Intangible Assets [Line Items]
Net Amount	$ 857	$ 964
Patent license
Finite Lived Intangible Assets [Line Items]
Useful Lives	7 years
Gross Carrying Amount	$ 1,000	1,000
Accumulated Amortization	143	36
Net Amount	$ 857	$ 964

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Estimated future amortization expense of purchased intangible assets
2018 (remaining 3 months)	$ 36
2019	143
2020	143
2021	143
2022	143
Thereafter	249
Net Amount	$ 857	$ 964

Investments - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Cash, cash equivalents and short-term investments
Proceeds from Sale of Available-for-sale Securities, Debt	$ 23,900
Unrealized gain on investments			$ 319	$ (6)	$ 443	$ (76)
Technology Company
Cash, cash equivalents and short-term investments
Unrealized gain on investments					300
Technology Company \| Common Stock
Cash, cash equivalents and short-term investments
Investment owned, shares		143,000
Shares lock-up period		6 months
Shares lock-up expiration date		2018-04
Investment owned, fail value			$ 900		900
Other expense, net
Cash, cash equivalents and short-term investments
Available for sale securities, reclassified from other comprehensive income to other expense, net					$ 77

Investments - Schedule of Available-for-Sale Debt Securities that were in a Continuous Unrealized Loss Position (Details) - U.S. government agency securities $ in Thousands	12 Months Ended
	Jun. 30, 2017 USD ($)
Gross Unrealized Losses
Less Than 12 Months	$ (31)
12 Months or Greater	(58)
Total	(89)
Estimated Fair Value
Less Than 12 Months	11,970
12 Months or Greater	11,939
Total	$ 23,909

Investments - Schedule of Available-for-Sale Debt Securities that were in a Continuous Unrealized Loss Position (Parenthetical) (Details)	Mar. 31, 2018 USD ($)
U.S. government agency securities
Investment [Line Items]
Number of positions held in an unrealized loss position	0

Derivative Financial Instruments - Additional Information (Details) - contract	Mar. 31, 2018	Jun. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Outstanding foreign currency contracts (number of contracts)	0	0

Derivative Financial Instruments - Schedule of Gains (Losses) Associated with the Company's Derivative Financial Instruments (Details) - Other expense, net - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Foreign currency exchange gain (loss) on foreign contracts	$ (1,047)	$ (44)	$ 1,477	$ 40
Foreign contracts
Foreign currency exchange gain (loss) on foreign contracts	$ 726	$ 225	$ (1,712)	$ (942)

Fair Value Measurements - Summary of Financial Assets that were Accounted for at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financial assets
Amortized Cost	$ 70,925	$ 96,082
Gross Unrealized Gains	355
Gross Unrealized Losses		(89)
Cash and cash equivalents	70,392	72,084
Short-term investments	888	23,909
Cash
Financial assets
Amortized Cost	70,392	70,515
Cash and cash equivalents	70,392	70,515
Level 2 \| Corporate securities
Financial assets
Amortized Cost	533
Gross Unrealized Gains	355
Short-term investments	$ 888
Level 2 \| U.S. government agency securities
Financial assets
Amortized Cost		23,998
Gross Unrealized Losses		(89)
Short-term investments		23,909
Level 1 \| Money market funds
Financial assets
Amortized Cost		1,569
Cash and cash equivalents		$ 1,569

Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of all Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Carrying Value
Fair value measurement
Long term debt	$ 134,321	$ 164,571
Fair Value
Fair value measurement
Long term debt	162,623	174,676
Non-recurring basis \| Carrying Value \| Level 2 \| 3.50% Convertible Notes
Fair value measurement
Long term debt		44,099
Non-recurring basis \| Carrying Value \| Level 2 \| 3.50% Series A Convertible Notes
Fair value measurement
Long term debt		68,924
Non-recurring basis \| Carrying Value \| Level 2 \| 3.75% Convertible Notes
Fair value measurement
Long term debt	68,598
Non-recurring basis \| Fair Value \| Level 2 \| 3.50% Convertible Notes
Fair value measurement
Long term debt		48,146
Non-recurring basis \| Fair Value \| Level 2 \| 3.50% Series A Convertible Notes
Fair value measurement
Long term debt		74,982
Non-recurring basis \| Fair Value \| Level 2 \| 3.75% Convertible Notes
Fair value measurement
Long term debt	96,900
Revolving Credit Facility \| Non-recurring basis \| Carrying Value \| Level 2
Fair value measurement
Long term debt	28,007	51,548
Revolving Credit Facility \| Non-recurring basis \| Fair Value \| Level 2
Fair value measurement
Long term debt	28,007	$ 51,548
Term loan \| Non-recurring basis \| Carrying Value \| Level 2
Fair value measurement
Long term debt	37,716
Term loan \| Non-recurring basis \| Fair Value \| Level 2
Fair value measurement
Long term debt	$ 37,716

Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of all Debt (Parenthetical) (Details)	Mar. 31, 2018	Aug. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Apr. 30, 2014	Feb. 28, 2013
3.50% Convertible Notes
Fair value measurement
Interest rate (as a percent)	3.50%		3.50%	3.50%		3.50%
3.50% Series A Convertible Notes
Fair value measurement
Interest rate (as a percent)	3.50%		3.50%		3.50%
3.75% Convertible Notes
Fair value measurement
Interest rate (as a percent)	3.75%	3.75%	3.75%

Debt - Additional Information (Details)					1 Months Ended			9 Months Ended
Debt - Additional Information (Details)	Feb. 07, 2018 shares	Feb. 01, 2018 USD ($) shares	Jan. 30, 2018 USD ($)	Jun. 14, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2014 USD ($) $ / shares	Feb. 28, 2013 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Aug. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017
Debt
Common stock value								$ 86,000		$ 84,000
Principal amount of the Notes								153,007,000		166,548,000
Revolving Credit Facility
Debt
Principal amount of the Notes								28,007,000		$ 51,548,000
Initial borrowing capacity				$ 52,000,000
Minimum drawn balance (as a percent)				30.00%
Outstanding revolving credit facility								$ 28,000,000
90-day LIBOR \| Revolving Credit Facility
Debt
Interest rate determination basis								90-day LIBOR
Variable rate (as a percent)				4.50%
Repurchase
Debt
Repurchase/Retirement of existing notes									$ 28,000,000
Revolving Credit Agreement \| Revolving Credit Facility
Debt
Reduced borrowing capacity					$ 32,000,000
Term Loan Facility due December 2022
Debt
Principal amount of the Notes								$ 40,000,000
Term Loan Facility due December 2022 \| Term loan
Debt
Principal amount of the Notes								$ 40,000,000
Initial term loan borrowing capacity					40,000,000
Additional term loan borrowing capacity					$ 20,000,000
Loan prepayment fees for first year (percentage)					3.00%
Loan prepayment fees for second year (percentage)					2.00%
Loan prepayment fees for third year (percentage)					1.00%
Term of loan (in months)					60 months
Term of interest payable (in months)					24 months
Administrative fee payable on term loan as a percentage					0.25%
Final payment of administrative fee payable on term loan as a percentage					4.00%
Term Loan Facility due December 2022 \| 90-day LIBOR \| Term loan
Debt
Interest rate determination basis								90-day LIBOR
Variable rate (as a percent)					6.75%
3.50% Convertible Notes
Debt
Interest rate (as a percent)							3.50%	3.50%		3.50%	3.50%
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)							187.6877
Principal amount used for debt instrument conversion ratio							$ 1,000
Conversion price (in dollars per share) \| $ / shares							$ 5.33
Repayment of convertible debt and accrued interest		$ 13,200,000	$ 13,000,000
Common stock value			300,000
Period of volume weighted averaging price which is used to determine total number of shares	3 days
Principal amount of the Notes										$ 44,654,000
3.50% Convertible Notes \| Other expense, net
Debt
Extinguishment of debt			$ 300,000
3.50% Convertible Notes \| Common Stock
Debt
Common stock shares issued to note holders \| shares	253,000
3.50% Series A Convertible Notes
Debt
Interest rate (as a percent)						3.50%		3.50%		3.50%
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)						187.6877
Principal amount used for debt instrument conversion ratio						$ 1,000
Conversion price (in dollars per share) \| $ / shares						$ 5.33
Repayment of convertible debt and accrued interest		$ 27,000,000
Principal amount of the Notes										$ 70,346,000
3.50% Series A Convertible Notes \| Common Stock
Debt
Common stock shares issued to settle Convertible Notes \| shares		1,252
3.75% Convertible Senior Notes due 2022
Debt
Interest rate (as a percent)								3.75%	3.75%	3.75%
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)								174.8252
Principal amount used for debt instrument conversion ratio								$ 1,000
Conversion price (in dollars per share) \| $ / shares								$ 5.72
Aggregate principal amount of debt issued									$ 85,000,000
Repurchase price, as a percentage of the principal amount, in the event of a fundamental change, as defined in Indenture								100.00%
Principal amount of the Notes								$ 85,000,000
3.75% Convertible Senior Notes due 2022 \| Exchange
Debt
Aggregate principal amount of debt issued									53,000,000
3.75% Convertible Senior Notes due 2022 \| Repurchase
Debt
Aggregate principal amount of debt issued									32,000,000
3.50% Convertible Notes due 2018 and 3.5% Series A Senior Notes due February 2018 \| Exchange
Debt
Aggregate principal amount of debt issued									$ 47,000,000

Debt - Schedule of Carrying Values of All Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Debt
Carrying amount of equity conversion component	$ 14,650	$ 7,844
Principal amount of the Notes	153,007	166,548
Unamortized debt costs	(5,363)	(555)
Unamortized debt discount	(13,323)	(1,422)
Net carrying amount	134,321	164,571
Reported as:
Short-term debt		113,023
Long-term debt	134,321	51,548
Net carrying amount	134,321	164,571
Revolving Credit Facility
Debt
Principal amount of the Notes	28,007	51,548
Net carrying amount	28,007	51,548
Reported as:
Net carrying amount	28,007	51,548
3.75% Convertible Senior Notes due 2022
Debt
Carrying amount of equity conversion component	14,650
Principal amount of the Notes	85,000
Unamortized debt costs	(3,501)
Unamortized debt discount	(12,901)
Net carrying amount	68,598
Reported as:
Net carrying amount	68,598
3.50% Convertible Notes
Debt
Principal amount of the Notes		44,654
Unamortized debt costs		(555)
Net carrying amount		44,099
Reported as:
Net carrying amount		44,099
3.50% Series A Convertible Notes
Debt
Carrying amount of equity conversion component		7,844
Principal amount of the Notes		70,346
Unamortized debt discount		(1,422)
Net carrying amount		68,924
Reported as:
Net carrying amount		$ 68,924
Term Loan Facility due December 2022
Debt
Principal amount of the Notes	40,000
Unamortized debt costs	(1,862)
Unamortized debt discount	(422)
Net carrying amount	37,716
Reported as:
Net carrying amount	$ 37,716

Debt - Summary of Interest Expense on All Convertible Debt (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Debt Disclosure [Abstract]
Interest expense related to contractual interest coupon	$ 2,608	$ 2,255	$ 7,444	$ 7,125
Interest expense related to amortization of debt discount	862	661	2,589	2,117
Interest expense related to amortization of debt issuance costs	391	383	1,259	1,165
Total interest expense recognized	$ 3,861	$ 3,299	$ 11,292	$ 10,407

Share-Based Compensation - Summary of Share-Based Compensation Expenses by Functional Line Item (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-based compensation expenses
Share-based compensation expense	$ 3,204	$ 3,598	$ 9,074	$ 9,985
Cost of revenue
Share-based compensation expenses
Share-based compensation expense	442	519	1,410	1,461
Research and development
Share-based compensation expenses
Share-based compensation expense	577	644	1,842	1,808
Selling and marketing
Share-based compensation expenses
Share-based compensation expense	496	769	863	2,077
General and administrative
Share-based compensation expenses
Share-based compensation expense	$ 1,689	$ 1,666	$ 4,959	$ 4,639

Net Loss Per Common Share - Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per common share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss used to compute basic and diluted loss per share	$ (8,852)	$ (5,029)	$ (22,953)	$ (24,324)
Weighted average common shares used in computing net loss per share:
Weighted average shares used to compute basic and diluted loss per share	85,459	82,913	84,594	82,268

Net Loss Per Common Share - Additional Information (Details) - shares shares in Millions	9 Months Ended
	Mar. 31, 2018	Aug. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Feb. 28, 2013
3.50% Convertible Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Interest rate (as a percent)	3.50%		3.50%	3.50%	3.50%
Date of convertible debt retired	2018-02
3.75% Convertible Senior Notes due 2022
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Interest rate (as a percent)	3.75%	3.75%	3.75%
Common stock not included in the calculation of potentially diluted shares	14.9

Net Loss Per Common Share - Schedule of all potentially dilutive securities excluded from the computation of basic and diluted net income (loss) per common share (Details) - shares shares in Thousands	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)	7,874	16,380
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)	2,672	2,510
RSUs, PSUs and MSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)	5,202	5,492
3.50% Convertible Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)		8,378

Net Loss Per Common Share - Schedule of all potentially dilutive securities excluded from the computation of basic and diluted net income (loss) per common share - Parenthetical (Details)	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Feb. 28, 2013
3.50% Convertible Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Interest rate (as a percent)	3.50%	3.50%	3.50%	3.50%

Segment Information - Additional Information (Details)	9 Months Ended
Segment Information - Additional Information (Details)	Mar. 31, 2018 segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment Information - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Information
Revenue	$ 99,832	$ 97,312	$ 291,111	$ 271,320
Americas
Segment Information
Revenue	41,767	38,720	115,544	118,545
Europe, Middle East, India and Africa
Segment Information
Revenue	14,731	21,785	81,885	68,705
Asia-Pacific and Japan
Segment Information
Revenue	$ 43,334	$ 36,807	$ 93,682	$ 84,070

Segment Information - Schedule of Geographic Areas in Which the Company has Long Lived Tangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Segment Information
Property and equipment, net	$ 24,462	$ 23,062
Americas
Segment Information
Property and equipment, net	19,958	18,435
Europe, Middle East, India and Africa
Segment Information
Property and equipment, net	665	730
Asia-Pacific and Japan
Segment Information
Property and equipment, net	$ 3,839	$ 3,897

Income Tax - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 566	$ 842	$ 1,289	$ 642
Effective income tax rate			21.00%		35.00%
Deferred tax assets	$ 117,000		$ 117,000			$ 174,000
Tax cuts and jobs act 2017, measurement period from enactment date	1 year