Accuray (ARAY) 10-K 25 Aug 17 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2017	Aug. 15, 2017	Dec. 31, 2016
Document and Entity Information
Entity Registrant Name	ACCURAY INC
Entity Central Index Key	1,138,723
Document Type	10-K
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 214,409,027
Entity Common Stock, Shares Outstanding		83,746,253
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Current assets:
Cash and cash equivalents	$ 72,084	$ 119,771
Short-term investments	23,909	47,239
Restricted cash	12,829	891
Accounts receivable, net of allowance for doubtful accounts of $420 and $826 as of June 30, 2017 and June 30, 2016, respectively	72,789	56,810
Inventories	105,054	115,987
Prepaid expenses and other current assets	18,988	16,098
Deferred cost of revenue	3,350	4,884
Total current assets	309,003	361,680
Property and equipment, net	23,062	27,878
Goodwill	57,812	57,848
Intangible assets, net	964	7,611
Deferred cost of revenue	206	1,996
Restricted cash	322	1,471
Other assets	15,095	10,549
Total assets	406,464	469,033
Current liabilities:
Accounts payable	17,486	15,229
Accrued compensation	25,402	18,725
Other accrued liabilities	23,870	22,184
Short-term debt	113,023	39,900
Customer advances	16,926	22,123
Deferred revenue	87,785	92,051
Total current liabilities	284,492	210,212
Long-term liabilities:
Long-term other liabilities	10,068	10,984
Deferred revenue	13,823	17,665
Long-term debt	51,548	170,512
Total liabilities	359,931	409,373
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; authorized: 5,000,000 shares; no shares issued and outstanding
Common stock, $0.001 par value; authorized: 200,000,000 shares as of June 30, 2017 and June 30, 2016, respectively; issued and outstanding: 83,739,804 and 81,378,208 shares at June 30, 2017 and June 30, 2016, respectively	84	81
Additional paid-in-capital	496,887	481,346
Accumulated other comprehensive loss	(52)	(960)
Accumulated deficit	(450,386)	(420,807)
Total stockholders' equity	46,533	59,660
Total liabilities and stockholders' equity	$ 406,464	$ 469,033

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 420	$ 826
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized shares	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
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	83,739,804	81,378,208
Common stock, outstanding shares	83,739,804	81,378,208

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Net revenue:
Products	$ 179,611	$ 193,299	$ 178,710
Services	203,803	205,501	201,091
Total net revenue	383,414	398,800	379,801
Cost of revenue:
Cost of products	113,357	108,671	104,549
Cost of services	128,716	131,416	129,850
Total cost of revenue	242,073	240,087	234,399
Gross profit	141,341	158,713	145,402
Operating expenses:
Research and development	49,921	56,652	55,752
Selling and marketing	57,477	56,812	62,440
General and administrative	43,766	50,122	46,379
Total operating expenses	151,164	163,586	164,571
Loss from operations	(9,823)	(4,873)	(19,169)
Other expense, net	(18,718)	(18,295)	(18,621)
Loss before provision for income taxes	(28,541)	(23,168)	(37,790)
Provision for income taxes	1,038	2,336	2,419
Net loss	$ (29,579)	$ (25,504)	$ (40,209)
Loss per share attributable to stockholders
Net loss per share - basic and diluted	$ (0.36)	$ (0.32)	$ (0.51)
Weighted average common shares used in computing net loss per share:
Basic and diluted	82,495	80,509	78,277
Net loss	$ (29,579)	$ (25,504)	$ (40,209)
Foreign currency translation adjustment	33	(47)	(1,196)
Unrealized gain (loss) on investments, net of tax	(74)	62	(95)
Change in defined benefit pension obligation	949	(549)	(950)
Comprehensive loss	$ (28,671)	$ (26,038)	$ (42,450)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balance at Jun. 30, 2014	$ 98,548	$ 77	$ 451,750	$ 1,815	$ (355,094)
Balance (in shares) at Jun. 30, 2014		77,178,365
Increase (Decrease) in Stockholders' Equity
Exercise of Stock options, net	2,563		2,563
Exercise of Stock options, net (in shares)		529,331
Issuance of restricted stock		$ 1	(1)
Issuance of restricted stock (in shares)		1,174,531
Issuance of common stock under employee stock purchase plan	4,033	$ 1	4,032
Issuance of common stock under employee stock purchase plan (in shares)		719,279
Share-based compensation	13,746		13,746
Tax withholding upon vesting of restricted stock units	(660)		(660)
Tax withholding upon vesting of restricted stock units (in shares)		(123,668)
Net loss	(40,209)				(40,209)
Cumulative translation adjustment	(1,196)			(1,196)		$ (1,196)
Unrealized gain (loss) on investments, net of tax	(95)			(95)
Change in defined benefit pension obligation	(950)			(950)		(950)
Balance at Jun. 30, 2015	75,780	$ 79	471,430	(426)	(395,303)
Balance (in shares) at Jun. 30, 2015		79,477,838
Increase (Decrease) in Stockholders' Equity
Exercise of Stock options, net	285		285
Exercise of Stock options, net (in shares)		58,279
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock (in shares)		1,570,577
Issuance of common stock under employee stock purchase plan	3,588		3,588
Issuance of common stock under employee stock purchase plan (in shares)		729,259
Share-based compensation	12,396		12,396
Unamortized Convertible Senior Note issuance costs reclassified to equity	(3,519)		(3,519)
Tax withholding upon vesting of restricted stock units	(2,832)		(2,832)
Tax withholding upon vesting of restricted stock units (in shares)		(457,745)
Net loss	(25,504)				(25,504)
Cumulative translation adjustment	(48)			(48)		(47)
Unrealized gain (loss) on investments, net of tax	63			63
Change in defined benefit pension obligation	(549)			(549)		(549)
Balance at Jun. 30, 2016	59,660	$ 81	481,346	(960)	(420,807)	$ 59,660
Balance (in shares) at Jun. 30, 2016		81,378,208				81,378,208
Increase (Decrease) in Stockholders' Equity
Exercise of Stock options, net	463		463
Exercise of Stock options, net (in shares)		112,482
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock (in shares)		1,709,957
Issuance of common stock under employee stock purchase plan	3,346	$ 1	3,345
Issuance of common stock under employee stock purchase plan (in shares)		870,037
Share-based compensation	13,154		13,154
Tax withholding upon vesting of restricted stock units	(1,419)		(1,419)
Tax withholding upon vesting of restricted stock units (in shares)		(330,880)
Net loss	(29,579)				(29,579)
Cumulative translation adjustment	33			33		$ 33
Unrealized gain (loss) on investments, net of tax	(74)			(74)
Change in defined benefit pension obligation	949			949		949
Balance at Jun. 30, 2017	$ 46,533	$ 84	$ 496,887	$ (52)	$ (450,386)	$ 46,533
Balance (in shares) at Jun. 30, 2017		83,739,804				83,739,804

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net loss	$ (29,579)	$ (25,504)	$ (40,209)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	18,043	18,296	19,493
Share-based compensation	13,629	12,638	13,930
Amortization of debt issuance costs	3,785	1,728	1,503
Amortization and accretion of discount and premium on investments	67	801	1,018
Accretion of interest on debt	4,052	6,321	7,241
Provision for (recovery of) bad debt, net	119	127	(14)
Provision for write-down of inventories	2,253	2,444	1,507
Loss on disposal of property and equipment	8	153	62
Loss on extinguishment of debt		965
Provision (benefit) for deferred income taxes	(268)	(404)	664
Changes in assets and liabilities:
Accounts receivable, short and long-term	(15,732)	16,994	(7,172)
Inventories	7,675	(10,502)	(21,094)
Prepaid expenses and other assets	(4,437)	16	1,083
Deferred cost of revenue	3,321	1,452	7,776
Accounts payable	2,189	2,404	(1,822)
Accrued liabilities	8,316	(1,944)	(8,614)
Customer advances	(5,158)	2,578	577
Deferred revenues	(8,663)	2,362	9,662
Net cash provided by (used in) operating activities	(380)	30,925	(14,409)
Cash flows from investing activities
Purchases of property and equipment, net	(5,031)	(8,066)	(10,445)
Purchases of intangible assets	(333)
Purchases of investments	(14,992)	(64,356)	(107,162)
Sales and maturities of investments	38,179	80,684	121,296
Net cash provided by investing activities	17,823	8,262	3,689
Cash flows from financing activities
Proceeds from employee stock plans	3,786	3,849	6,555
Taxes paid related to net share settlement of equity awards	(1,419)	(2,832)	(660)
Payments made to note and loan holders	(105,158)	(66,406)
Proceeds from debt, net of costs	48,253	64,632
Net cash provided by (used in) financing activities	(54,538)	(757)	5,895
Effect of exchange rate changes on cash and cash equivalents	197	(1,006)	(5,757)
Net increase (decrease) in cash, cash equivalents and restricted cash	(36,898)	37,424	(10,582)
Cash, cash equivalents and restricted cash at beginning of period	122,133	84,709	95,291
Cash, cash equivalents and restricted cash at end of period	85,235	122,133	84,709
Supplemental Disclosure of Cash Flow Information
Cash paid for income taxes	4,458	1,026	3,184
Cash paid for interest	9,927	10,340	7,207
Non-cash financing activity:
Purchases of property and equipment recorded in accounts payable and accrued liabilities	210	218	$ 638
Purchase of intangible assets in accrued liabilities	667
Transfers of equipment to inventory	$ 1,395	$ 1,660

Description of Business

Description of Business	12 Months Ended
	Jun. 30, 2017
Description of Business
Description of Business	1. Description of Business Organization Accuray Incorporated (together with its subsidiaries, the "Company" or "Accuray") is incorporated in Delaware and has its principal place of business in Sunnyvale, California. The Company designs, develops and sells advanced radiosurgery and radiation therapy systems for the treatment of tumors throughout the body. The Company has offices in the United States, Switzerland, China, Hong Kong and Japan and conducts its business worldwide.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Jun. 30, 2017
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). The 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. Long-term accounts receivable that were previously reported in prepaid expenses and other assets in prior year's consolidated statements of cash flows have been reclassified to accounts receivable, short and long-term to conform to the current year's presentation. These reclassifications had no impact on previously reported net cash provided by (used in) operating activities in consolidated statements of cash flows for the years ended June 30, 2016 and 2015. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures at the date of the financial statements. Key estimates and assumptions made by the Company relate to revenue recognition, assessment of recoverability of goodwill and intangible assets, valuation of inventories, share-based compensation expense, convertible notes, income taxes, allowance for doubtful accounts and loss contingencies. Actual results could differ materially from those estimates. Foreign Currency The Company's international subsidiaries use their local currencies as their functional currencies. For those subsidiaries, assets and liabilities are translated at exchange rates in effect at the balance sheet date and income and expense accounts at the average exchange rate. Resulting translation adjustments are excluded from the determination of net loss and are recorded in accumulated other comprehensive loss as a separate component of stockholders' equity. Net foreign currency exchange transaction gains or losses are included as a component of other expense, net, in the Company's consolidated statements of operations and comprehensive loss. Fair Value Measurements The carrying values of the Company's financial instruments including cash equivalents, restricted cash, accounts receivable and accounts payable are approximately equal to their respective fair values due to the relatively short-term nature of these instruments. Also refer to Note 5, Financial Instruments, for further details. Cash and Cash Equivalents The Company considers currency on hand, demand deposits, time deposits, and all highly liquid investments with an original maturity of three months or less at the date of purchase to be cash and cash equivalents. Cash and cash equivalents are held in various financial institutions in the United States and internationally. Investments The Company classifies all its investments as available-for-sale at the time of purchase since it is management's intent that these investments be available for current operations, and as such, includes these investments as short-term investments on its balance sheets. These investments primarily consist of commercial paper, U.S. treasury securities, and U.S. government agency and corporate debt securities. Short-term 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), as a separate component of stockholders' equity. Realized gains and losses on the sale of securities are determined by specific identification of each security's cost basis. The Company regularly reviews its investment portfolio to determine if any security is other-than-temporarily impaired, which would require it to record an impairment charge in the period any such determination is made. In making this judgment, management evaluates, among other things, the duration and extent to which the fair value of a security is less than its cost, the financial condition of the issuer and any changes thereto, and management's intent to sell, or whether it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. Other expense, net, includes interest, dividends, amortization of purchase premiums and discounts, realized gains and losses on sales of securities and other-than-temporary declines in the fair value of securities, if any. Concentration of Credit Risk and Other Risks and Uncertainties The Company's cash and cash equivalents are mainly deposited with several major financial institutions. At times, deposits in these institutions exceed the amount of insurance provided on such deposits. The Company has not experienced any losses in such accounts and believes that it is not exposed to any significant risk on these balances. The Company has placed its investments with high-credit quality issuers. The Company does not invest an amount exceeding 5% of its combined cash, cash equivalents and investments in the securities of any one obligor or maker, except for obligations of the United States government, obligations of United States government agencies and money market accounts. One customer represented more than 10% of total net revenue for the year ended June 30, 2016 and no customer represented 10% or more of total net revenue for the years ended June 30, 2017 and 2015. Two customers accounted for 30% of accounts receivable, net as at June 30, 2017 and one customer accounted for 18% of accounts receivable, net at June 30, 2016. The Company performs ongoing credit evaluations of its customers and maintains reserves for potential credit losses. Accounts receivable are deemed past due in accordance with the contractual terms of the agreement. Accounts are charged against the allowance for doubtful accounts once collection efforts are unsuccessful. Historically, such losses have been within management's expectations. Single-source suppliers presently provide the Company with several components. In most cases, if a supplier was unable to deliver these components, the Company believes that it would be able to find other sources for these components subject to any regulatory qualifications, if required. Restricted Cash Restricted cash primarily consists of cash that is temporarily held in bank accounts which are under the control of the lender to the Revolving Credit Facility, certificates of deposit held as guarantees in connection with customer contracts and corporate leases as well as funds held as guarantees for Value-Added Tax (VAT) obligations in a foreign jurisdiction. Inventories Inventories are stated at the lower of cost (on a first-in, first-out basis) or market value. Excess and obsolete inventories are written down based on historical sales and forecasted demand, as judged by management. Revenue Recognition The Company's revenue is primarily derived from sales of CyberKnife and TomoTherapy Systems and services, which include post-contract customer support or PCS, installation services, training and other professional services. The Company records its revenues net of any value added or sales tax. In all sales arrangements, the Company recognizes revenues when there is persuasive evidence of an arrangement, the fee is fixed or determinable, collection of the fee is reasonably assured and delivery has occurred. Payments received in advance of system shipment are recorded as customer advances and are recognized as revenue or deferred revenue upon product shipment or installation. The Company assesses the probability of collection based on a number of factors, including past transaction history with the customer and credit-worthiness of the customer. The Company generally does not request collateral from its customers. If the Company determines that collection is not reasonably assured, the Company will defer the fee and recognize revenue upon receipt of cash. The Company frequently enters into sales arrangements that contain multiple elements or deliverables. For sale arrangements that contain multiple elements, the Company allocates the arrangement consideration to each element based on the relative selling price method, whereby the relative selling price of each deliverable is determined using vendor specific objective evidence (VSOE) of fair value, if it exists. VSOE of fair value for each element is based on the Company's standard rates charged for the product or service when such product or service is sold separately or based upon the price established by the Company's pricing committee when that product or service is not yet being sold separately. When the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements, which may be due to the Company infrequently selling each element separately, not pricing products within a narrow range, or only having a limited sales history, the Company attempts to estimate the selling price of each element based on third-party evidence of selling price (TPE), as determined based on competitors' or third-party vendors' prices for similar deliverables when sold separately. When the Company is not able to establish selling price using VSOE or TPE, the Company uses its best estimate of selling price (BESP), in its allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for a product or service by considering multiple factors including, but not limited to, pricing practices, internal costs, geographies and gross margin. The determination of BESP is made through annual analysis of the Company's pricing practices and adjusted if necessary. The Company has a limited number of software offerings which are not required to deliver its systems' essential functionality and can be sold separately. The Company accounts for the separate sale of its software products in accordance with the applicable guidance for software revenue recognition. The Company's multiple-element arrangements may also include software deliverables that are subject to the software revenue recognition guidance; and in these cases, the revenue for these multiple-element arrangements is allocated to the software deliverable and the non-software deliverables based on the relative selling prices of all of the deliverables in the arrangement using VSOE, TPE or BESP. The Company regularly reviews VSOE, TPE and BESP for all of its products and services. As the Company's go-to-market strategies and other factors change, the Company may modify its pricing practices in the future, which may impact the selling prices of systems and services as well as VSOE, TPE and BESP of systems and services. As a result, the Company's future revenue recognition for multiple element arrangements could differ materially from that recorded in the current period. Product Revenue The majority of product revenue is generated from sales of CyberKnife and TomoTherapy systems. If the Company is responsible for installation, the Company recognizes revenue after installation and acceptance of the system. Otherwise, revenue is generally recognized upon delivery, assuming all other revenue recognition criteria are met. The Company could sell its systems with PCS contracts, installation services, training, and at times, professional services. PCS contracts provide planned and corrective maintenance services, software updates, bug fixes, as well as call-center support. The Company records revenues from sales of systems, product upgrades and accessories to distributors depending on the terms of the distribution agreement as well as terms and conditions executed for each sale, and once all revenue recognition criteria have been met. The Company's agreements with customers and distributors for system sales generally do not contain product return rights. Certain distributor agreements include parts inventory buy-back provisions upon distributorship termination. The Company accrues an inventory buy-back liability when and if such distributorship termination is expected and the liability can be estimated. Service Revenue Service revenue is generated primarily from PCS (warranty period services and post warranty services), installation services, training, and professional services. Service revenue is recognized either ratably over the contractual period or when service is performed, depending on specific terms and conditions in agreements with customers. Costs associated with service revenue are expensed when incurred, except when those costs are related to system upgrades purchased within a service contract. In those cases, the costs of such upgrades are recognized at the time the upgrade revenue is recognized. Deferred Revenue and Deferred Cost of Revenue Deferred revenue consists of deferred product revenue and deferred service revenue. Deferred product revenue arises from timing differences between the shipment of product and satisfaction of all revenue recognition criteria consistent with the Company's revenue recognition policy. Deferred service revenue results from the advance payment for services to be delivered over a period of time. Deferred cost of revenue consists of the direct costs associated with the manufacturing of units and direct service upgrade costs for which the revenue has been deferred in accordance with the Company's revenue recognition policies. Deferred revenue and associated deferred cost of revenue expected to be realized within one year are classified as current liabilities and current assets, respectively. Customer Advances Customer advances represent payments made by customers in advance of product shipment. Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are depreciated on a straight-line basis over the remaining term of the lease or the estimated useful life of the asset, whichever is shorter. Machinery and equipment are depreciated over five years. Furniture and fixtures are depreciated over four years. Computer and office equipment and computer software are depreciated over three years. Repairs and maintenance costs, which are not considered improvements and do not extend the useful life of the property and equipment, are expensed as incurred. Software Capitalization Costs Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. No costs associated with the development of software have been capitalized as the Company believes its current software development process is essentially completed concurrent with the establishment of technological feasibility. Impairment of Long-Lived Assets The Company reviews long-lived assets, including intangible assets, property and equipment, for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable using pretax undiscounted cash flows. Impairment, if any, is measured as the amount by which the carrying value of a long-lived asset exceeds its fair value. Goodwill and Purchased Intangible Assets Goodwill is not amortized, but is evaluated for impairment on an annual basis and when impairment indicators are present. The Company has assessed that it has one operating segment and one reporting unit, and the consolidated net assets, including existing goodwill and other intangible assets, are considered to be the carrying value of the reporting unit. The Company estimates the fair value of the reporting unit based on the Company's closing stock price on the trading day closest to the annual review date multiplied by the outstanding shares on that date. If the carrying value of the reporting unit is in excess of its fair value, an impairment may exist, and the Company must perform the second step of the analysis, in which the implied fair value of the goodwill is compared to its carrying value to determine the impairment charge, if any. If the estimated fair value of the reporting unit exceeds the carrying value of the reporting unit, goodwill is not impaired and no further analysis is required. There was no impairment of goodwill identified in the fiscal years ended June 30, 2017, 2016 and 2015. Purchased intangible assets other than goodwill, including developed technology are amortized on a straight-line basis over their estimated useful lives unless their lives are determined to be indefinite. Purchased intangible assets are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets which range from approximately one to seven years. Acquisition-related expenses and restructuring costs are recognized separately from the business combination and are expensed as incurred. Shipping and Handling The Company's billings for shipping and handling for product shipments to customers are included in cost of products. Shipping and handling costs incurred for inventory purchases are capitalized in inventory and expensed in cost of products. Advertising Expenses The Company expenses the costs of advertising and promoting its products and services as incurred. Advertising expenses were approximately $0.4 million, $0.3 million and $0.5 million for the years ended June 30, 2017, 2016 and 2015, respectively. Research and Development Costs Costs related to research, design and development of products are charged to research and development expense as incurred. These costs include direct compensation, benefits, and other headcount related costs for research and development personnel; costs for materials used in research and development activities; costs for outside services and allocated portions of facilities and other corporate costs. The Company has entered into research and clinical study arrangements with selected hospitals, cancer treatment centers, academic institutions and research institutions worldwide. These agreements support the Company's internal research and development capabilities. Share-Based Compensation The Company issues stock-based compensation awards to employees and directors in the form of stock options, restricted stock units (RSUs), performance stock units (PSUs), market stock units (MSUs) and employee stock purchase plan (ESPP) awards (collectively, awards). The Company measures and recognizes compensation expense for all stock-based awards based on the awards' fair value. Share-based compensation for RSUs and PSUs is measured based on the value of the Company's common stock on the grant date. The Company uses the Monte-Carlo simulation model to estimate the fair value of MSUs. Share-based compensation for employee stock options and ESPP awards are measured on the date of grant using a Black-Scholes option pricing model. Awards vest either on a graded schedule or in a lump sum. The Company determines the fair value of each award as a single award and recognizes the expense on a straight-line basis over the service period of the award, which is generally the vesting period. The exercise price of stock options granted is equal to the fair market value of the Company's common stock on the date of grant. Stock options expire ten years from the date of grant. Share-based compensation expense for stock options, RSUs, PSUs and the ESPP is based on awards ultimately expected to vest, and the expense is recorded net of estimated forfeitures. The Company recognizes expense for MSUs net of estimated forfeitures and does not adjust the expense for subsequent changes in the expected outcome of the market-based vesting conditions. Loss Contingencies The Company is involved in various lawsuits, claims and proceedings that arise in the ordinary course of business. The Company records a provision for a liability when it believes that it is both probable that a liability has been incurred and the amount can be reasonably estimated. Significant judgment is required to determine both probability and the estimated amount. The Company reviews these provisions quarterly and adjusts these provisions to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and updated information. Net Loss Per Common Share Basic and diluted net loss per share is computed by dividing net loss attributable to stockholders by the weighted average number of common shares outstanding during the year. A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share attributable to stockholders follows (in thousands): Years ended June 30, 2017 2016 2015 Numerator: Net loss used to compute basic and diluted loss per share $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Denominator: Weighted average shares used to compute basic and diluted loss per share ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The potentially dilutive shares of the Company's common stock resulting from the assumed exercise of outstanding stock options, the vesting of Restricted Stock Units (RSU), Market Stock Units (MSU) and Performance Stock Units (PSU), and the purchase of shares under the 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 3.75% Convertible Senior Notes due August 2016 (the "3.75% Convertible Notes"), the 3.50% Convertible Senior Notes due February 1, 2018 (the "3.50% Convertible Notes"), the 3.50% Series A Convertible Notes (the "3.50% Series A Convertible Notes") due February 1, 2018 (together, the "Existing 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 June 30, 2017 2016 2015 Stock options RSUs, PSUs and MSUs 3.50% Convertible Notes 3.50% Series A Convertible Notes — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding Convertibles Notes—Diluted Share Impact The 3.75% Convertible Notes and 3.50% Series A Convertible Notes have an optional physical (share), cash or combination settlement feature and contain certain conditional conversion features. Due to the optional cash settlement feature and management's intent to settle the principal amount thereof in cash, the conversion shares underlying the outstanding principal amount of the 3.75% Convertible Notes and 3.50% Series A Convertible Notes, totaling approximately 3.9 million shares and 13.2 million shares, respectively, were not included in the potentially diluted share count table above. The Company's average stock price did not exceed the conversion price of the 3.75% Convertible Notes as of June 30, 2016 and 2015. The number of premium shares included in the Company's diluted share count will vary with fluctuations in the Company's share price. Higher actual share prices result in a greater number of premium shares. Income Taxes The Company is required to estimate its income taxes in each of the tax jurisdictions in which it operates prior to the completion and filing of tax returns for such periods. This process involves estimating actual current tax expense together with assessing temporary differences in the treatment of items for tax purposes versus financial accounting purposes that may create net deferred tax assets and liabilities. The Company accounts for income taxes under the asset and liability method, which requires, among other things, that deferred income taxes be provided for temporary differences between the tax bases of the Company's assets and liabilities and their financial statement reported amounts. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses, research and development credit carryforwards and other deferred tax assets. The Company records a valuation allowance to reduce its deferred tax assets to the amount the Company believes is more likely than not to be realized. Because of the uncertainty of the realization of the deferred tax assets, the Company has recorded a full valuation allowance against its domestic and certain foreign net deferred tax assets. The calculation of unrecognized tax benefits involves dealing with uncertainties in the application of complex global tax regulations. Management regularly assesses the Company's tax positions in light of legislative, bilateral tax treaty, regulatory and judicial developments in the countries in which the Company does business. The Company anticipates that except for $0.1 million in uncertain tax positions that may be reduced related to the lapse of various statutes of limitation, there will be no material changes in uncertain tax positions in the next 12 months. Accumulated Other Comprehensive Loss The components of comprehensive loss consist of net loss, unrealized gains and losses on available-for-sale investments, changes in foreign currency exchange rate translation and net changes related to a defined benefit pension plan. The unrealized gains and losses on available-for-sale investments, changes in foreign currency exchange rate translation and net changes related to the defined benefit pension plan are excluded from earnings and reported as a component of stockholders' equity. The foreign currency translation adjustment results from those subsidiaries not using the United States 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 at the current exchange rates at the end of each period. The resulting cumulative translation adjustments are recorded directly to the accumulated other comprehensive loss account in stockholders' equity. Revenues and expenses are translated at average exchange rates in effect during the period. Recent Accounting Standards Update Not Yet Effective In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 if its fiscal year 2019 and early adoption is permitted in any interim reporting period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements. 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 early adoption is permitted as of the beginning of an annual reporting period. The Company 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 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other Topics (Topic 350)—Simplifying the Test for Goodwill Impairment. This guidance eliminates the requirement to calculate the implied fair value of goodwill of a reporting unit by determining the fair value of its assets and liabilities (including unrecognized assets and liabilities) to measure a goodwill impairment charge. Instead, an entity will record an impairment charge based on the excess of the reporting unit's carrying amount over its fair value. The ASU will be effective for the Company in the first quarter of its fiscal year 2021 on a prospective basis and earlier adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company 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 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 ASU will be effective for the Company in the first quarter of its fiscal year 2019 and early adoption is permitted. The Company 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 June 2016, the FASB issued ASU No. 2016-13 (ASU 2016-13) Measurement of Credit Losses on Financial Instruments . ASU 2016-13 requires measurement and recognition of expected credit losses for financial assets held. This guidance will become effective for the Company beginning in the third quarter of fiscal year 2020 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted beginning in the third quarter of fiscal year 2019. The Company has not yet determined whether it will elect early adoption and is evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) (ASU 2016-09). 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. The amendments in this standard are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. Effective July 1, 2017, the Company has elected to continue the use of its forfeiture estimation method for share-based payment awards. The Company's adoption of this guidance will not have a significant impact on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). 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 U.S. 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. ASU 2016-02 requires additional disclosures. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. ASU 2016-02 requires adoption based upon a modified retrospective transition approach. Early adoption is permitted. The Company is currently evaluating the impact of the pending adoption of ASU 2016-02 on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01 (ASU 2016-01) Recognition and

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Jun. 30, 2017
Balance Sheet Components
Balance Sheet Components	3. Balance Sheet Components Cash and Cash Equivalents The following is a summary of cash and cash equivalents (in thousands): June 30, June 30, Cash $ $ Money market funds Commercial paper — Municipal government securities — ​ ​ ​ ​ ​ ​ ​ ​ Total cash and cash equivalents $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts receivable, net Accounts receivable, net consisted of the following (in thousands): June 30, June 30, Accounts receivable $ $ Unbilled fees and services ​ ​ ​ ​ ​ ​ ​ ​ Less: Allowance for doubtful accounts ) ) ​ ​ ​ ​ ​ ​ ​ ​ Accounts receivable, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company received payment or had credits of $0.1 million, added $0.2 million and wrote off $0.5 million from the allowance for doubtful accounts in fiscal 2017. The Company received payment or had credits of $0.2 million, added $0.3 million and wrote off $0.01 million from the allowance for doubtful accounts in fiscal 2016. 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 $7.4 million and $7.6 million at June 30, 2017 and 2016, respectively, and are included in Other Assets in the consolidated balance sheets. Of the $7.4 million in financing receivables at June 30, 2017, $2.8 million related to sales-type leases with customers while the remaining $4.6 million related to contractual maturities of more than one year. Of the $7.6 million in financing receivables at June 30, 2016, $3.5 million related to sales-type leases with customers while the remaining $4.1 million related to contractual maturities of more than one year. Due to the homogenous nature of the leasing transactions, the Company manages them on an aggregate basis when assessing and monitoring credit risk. 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 particular 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. Accounts rated as low risk typically have the equivalent of a Moody's rating of Baa3 or higher, while accounts rated as moderate risk generally have the equivalent of a Ba1 or lower. 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 June 30, 2017, 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 June 30, 2017. Based upon such assessment, the Company recorded an allowance for credit losses related to such financing receivables as of June 30, 2017 and did not record any allowance for credit losses as of June 30, 2016. A summary of the Company's financing receivables is presented as follows (in thousands): June 30, 2017 Lease Financed Total Gross $ $ $ Residual value — — — Unearned income ) — ) Allowance for credit loss ) — ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reported as: Current $ $ $ Non-current ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Lease Financed Total Gross $ $ $ Residual value — — — Unearned income ) — ) Allowance for credit loss — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reported as: Current $ $ $ Non-current ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 June 30, 2017 are presented as follows (in thousands): Year Ending June 30, Amount 2018 $ 2019 2020 2021 2022 ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Inventories Inventories consisted of the following (in thousands): June 30, June 30, Raw materials $ $ Work-in-process Finished goods ​ ​ ​ ​ ​ ​ ​ ​ Inventories $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company reclassified $0.9 million between raw materials and finished good as of June 30, 2016 to conform to current year's presentation of inventories. Property and Equipment, net Property and equipment consisted of the following (in thousands): June 30, June 30, Furniture and fixtures $ $ Computer and office equipment Software Leasehold improvements Machinery and equipment Construction in progress ​ ​ ​ ​ ​ ​ ​ ​ Less: Accumulated depreciation ) ) ​ ​ ​ ​ ​ ​ ​ ​ Property and equipment, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation and amortization expense related to property and equipment for the years ended June 30, 2017, 2016 and 2015 was $10.3 million, $10.3 million and $11.6 million, respectively. Accumulated Other Comprehensive Income (Loss) The following table summarizes the changes in accumulated other comprehensive income (loss) by component (in thousands): Foreign Unrealized Gains Change in Total Balance at June 30, 2015 $ $ ) $ ) $ ) Other comprehensive income (loss) before reclassifications ) ) ) Amounts reclassified from accumulated other comprehensive loss — ) — ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net current period other comprehensive income (loss) ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2016 ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2017 $ $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Foreign Exchange Instruments

Foreign Exchange Instruments	12 Months Ended
	Jun. 30, 2017
Foreign Exchange Instruments
Foreign Exchange Instruments	4. Foreign Exchange Instruments The Company utilizes foreign currency forward contracts with well-known financial institutions to manage its exposure of fluctuations in foreign currency exchange rates on certain intercompany balances and foreign currency denominated cash, customer receivables and liabilities. 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. The periods of these forward contracts range up to approximately three months and the notional amounts are intended to be consistent with changes in the underlying exposures. The Company intends to exchange foreign currencies for U.S. Dollars at maturity. There were no outstanding foreign currency forward contracts at the end of fiscal years 2017 and 2016. The following table shows the effect of forward contracts not designated as hedging instruments and foreign currency transactions gains and losses, which were included in "Other expense, net" on the consolidated statements of operations in fiscal years (in thousands): Years ended June 30, 2017 2016 2015 Foreign currency exchange gain (loss) on foreign contracts $ ) $ ) $ ) Foreign currency transactions gain (loss) )

Financial Instruments

Financial Instruments	12 Months Ended
	Jun. 30, 2017
Financial Instruments
Financial Instruments	5. Financial Instruments The Company considers all highly liquid investments held with various financial institutions, 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 it is management's intent that these investments are available for current operations and includes these investments on its balance sheets as short-term investments. Investments with original maturities longer than three months include commercial paper and investment- grade agency and 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. The Company defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) 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 reflect 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 following tables summarize the amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category for cash, cash equivalents and short-term investments (in thousands): June 30, 2017 Estimated Fair Value Amortized Gross Gross Cash and Short-term Cash $ $ — $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Money market funds — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 2 U.S. government agency securities — ) — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ — $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Estimated Fair Value Amortized Gross Gross Cash and Short-term Cash $ $ — $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Money market funds — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 2 Commercial paper — — U.S. government agency securities ) — U. S. treasury securities — — Municipal debt securities — — — Corporate debt securities — ) — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company's Level 2 investments in the table above are classified as Level 2 items because quoted prices in an active market are not readily accessible for those specific financial assets, or the Company may have relied on alternative pricing methods that do not rely exclusively on quoted prices to determine the fair value of the investments. Contractual maturities of available-for-sale securities at June 30, 2017 were as follows (in thousands): June 30, 2017 Amortized Estimated Due in 1 year or less $ $ Due in 1 - 2 years ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table summarizes our 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 Gross Estimated Gross Estimated Gross Estimated June 30, 2017 Debt Securities: U. S. government agency securities $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Debt Securities: Corporate debt securities $ ) $ $ ) $ $ ) $ U. S. government agency securities — — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company held a total of 8 positions as of June 30, 2017 and 11 positions as of June 30, 2016 that were in an unrealized loss position. Based on the Company's review of these securities, the Company believes it had no other-than-temporary impairments on these securities as of June 30, 2017 and 2016 because it does not intend to sell these securities and believes it is not more likely than not that it will be required to sell these securities before the recovery of their amortized cost basis. Gross realized gains and gross realized losses were insignificant for the years ended June 30, 2017, 2016 and 2015. Assets and Liabilities That Are Measured at Fair Value on a Nonrecurring Basis The Company's non-marketable equity investments and non-financial assets, such as goodwill, intangible assets, and property, plant, and equipment (measured at fair value if a write-down is recognized) are evaluated for impairment annually or when indicators of impairment exist. The fair value measurement of non-marketable equity investments is performed by a third-party analyst using Level 3 inputs. Non-financial assets such as identified intangible assets acquired in connection with an acquisition are measured at fair value using Level 3 inputs, which include discounted cash flow methodologies, or similar techniques, when there is limited market activity and the determination of fair value requires significant judgment and estimates. In addition, in evaluating the fair value of goodwill impairment, further corroboration is obtained using our market capitalization. The Company did not record any impairment charges for non-marketable equity investments and non-financial asset in the fiscal years ended June 30, 2017, 2016, and 2015. The 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 Existing 3.50% Convertible Notes is not readily available. The Company's Revolver Credit Facility and its Secured Loan are valued at market interest rates, which it considers to be a level 2 fair value measurement. Therefore, the Company's carrying value of these financial instruments approximate their fair value. The following table summarizes the carrying values and estimated fair values of the Company's Existing 3.50% Convertible Notes and other non-convertible debt (in thousands): June 30, 2017 June 30, 2016 Carrying Value Fair Value Carrying Value Fair Value 3.75% Convertible Notes $ — $ — $ $ 3.50% Convertible Notes 3.50% Series A Convertible Notes Secured Loan — Revolver Credit Facility — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Goodwill and Purchased Intangib

Goodwill and Purchased Intangible Assets	12 Months Ended
	Jun. 30, 2017
Goodwill and Purchased Intangible Assets
Goodwill and Purchased Intangible Assets	6. Goodwill and Purchased Intangible Assets Goodwill Goodwill as of June 30, 2017 and 2016 and changes in the carrying amount of goodwill for the respective periods are as follows (in thousands): As of June 30, 2017 2016 Balance at the beginning of the period $ $ Currency translation ) ) ​ ​ ​ ​ ​ ​ ​ ​ Balance at the end of the period $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In fiscal 2017 the Company performed its annual goodwill impairment test and determined that there was no impairment to goodwill. The Company will continue to monitor its recorded goodwill for indicators of impairment. Purchased Intangible Assets The Company's intangible assets associated with completed acquisitions and purchased patent license are as follows (in thousands): As of June 30, 2017 As of June 30, 2016 Useful Gross Accumulated Net Gross Accumulated Net (in years) Developed technology 5 - 6 $ $ ) $ — $ $ ) $ Patent license ) — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total intangible assets $ $ ) $ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ During fiscal year 2017, the Company purchased a patent license with a useful life of seven years. The Company did not identify any triggering events that would indicate potential impairment of its definite-lived intangible and long-lived assets as of June 30, 2017 and 2016. Amortization expense related to purchased intangible assets was $7.7 million, $8.0 million and $7.9 million for the years ended June 30, 2017, 2016 and 2015, respectively. The estimated future amortization expense of purchased intangible assets as of June 30, 2017 is as follows (in thousands): Year Ending June 30, Amount 2018 $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Jun. 30, 2017
Commitments and Contingencies
Commitments and Contingencies	7. Commitments and Contingencies Operating Lease Agreements and Long-term Debt The Company leases office and manufacturing space under non-cancelable operating leases with various expiration dates through June 2025. Rent expense was $8.6 million, $8.3 million and $8.0 million for the years ended June 30, 2017, 2016 and 2015, respectively. The terms of some of the facility leases provide for rental payments on a graduated scale. For these leases, the Company recognizes rent expense on a straight-line basis over the lease period, and has accrued for rent expense incurred but not paid. The Company is also required to make semi-annual interest payments on the Existing 3.50% Convertible Notes and monthly interest payments on the Revolver Credit Facility. See Note 12, Debt , for details. Future minimum lease payments under non-cancelable operating lease agreements and short-term principal and interest on the Existing 3.50% Convertible Notes and Revolving Credit Facility as of June 30, 2017 are as follows including the effects of the subsequent debt financing as reported in Note 18 (in thousands): Year Ending June 30, Operating Long-Term 2018 $ $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) These amounts represent principal and interest cash payments over the contractual life of the debt obligations, including anticipated interest payments that are not recorded on the Company's consolidated balance sheet. Any conversion, premium, redemption or purchase of Convertible Notes would impact cash payments noted in the preceding table. The Company's purchase commitments and obligations include all open purchase orders and contractual obligations in the ordinary course of business, including commitments with contract manufacturers and suppliers, for which the Company has not received the goods or services and acquisition and licensing of intellectual property. A majority of these purchase obligations are due within a year. Although open purchase orders are considered enforceable and legally binding, the terms generally allows the Company the option to cancel, reschedule, and adjust its requirements based on the Company's business needs prior to the delivery of goods or performance of services, and hence, have not been included in the table above. The Company enters into standard indemnification agreements with its landlords and all superior mortgagees and their respective directors, officers' agents, and employees in the ordinary course of business. Pursuant to these agreements, the Company will indemnify, hold harmless, and agree to reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally the landlords, in connection with any loss, accident, injury, or damage by any third-party with respect to the leased facilities. The term of these indemnification agreements is from the commencement of the lease agreements until termination of the lease agreements. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, historically the Company has not incurred claims or costs to defend lawsuits or settle claims related to these indemnification agreements. The Company has not recorded any liability associated with its indemnification agreements as it is not aware of any pending or threatened actions that represent probable losses as of June 30, 2017. Royalty Agreement The Company has an exclusive license agreement with the Wisconsin Alumni Research Foundation (WARF), to make, use, sell and otherwise distribute products under certain of WARF's patents anywhere in the world. The Company is required to pay WARF a royalty for each TomoTherapy System sold that includes the licensed technology. The license agreement expires upon expiration of the patents and may be terminated earlier if the Company so elects. WARF has the right to terminate the license agreement if the Company does not meet the minimum royalty obligation of $0.3 million per year, or if the Company commits any breach of the license agreement's covenants. The Company recorded royalty costs of $0.5 million, $0.6 million and $0.6 million for the years ended June 30, 2017, 2016 and 2015, respectively, which were recorded in cost of revenue or deferred cost of revenue. The Company had accrued liabilities of approximately $0.2 million and $0.2 million at June 30, 2017 and 2016, respectively, related to this agreement. 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 its customer. 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 June 30, 2017. 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 any current 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.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Jun. 30, 2017
Stockholders' Equity
Stockholders' Equity	8. Stockholders' Equity At June 30, 2017, the Company had 13.2 million shares of common stock reserved for future issuance to the holders of the 3.50% Convertible Senior Notes and had 7.7 million shares of common stock reserved for issuance under the stock incentive plans and the employee stock purchase plan.

Stock Incentive Plan and Employ

Stock Incentive Plan and Employee Stock Purchase Plan	12 Months Ended
	Jun. 30, 2017
Stock Incentive Plan and Employee Stock Purchase Plan
Stock Incentive Plan and Employee Stock Purchase Plan	9. Stock Incentive Plan and Employee Stock Purchase Plan As of June 30, 2017, the Company had three outstanding stock incentive plans: the 2016 Equity Incentive Plan, or the 2016 Plan; the 2007 Incentive Award Plan, or the 2007 Plan; and the 1998 Stock Incentive Plan, or the 1998 Plan. The 2016 Plan permits the granting of stock options, stock appreciation rights, restricted stock awards, performance shares, performance units, and restricted stock units, or RSUs. The vesting of RSUs granted under the 2016 Plan are primarily service-based (over the requisite service period) while the vesting of performance units granted under the 2016 Plan are primarily performance-based, or PSUs, or market-based, or MSUs. Only employees of the Company are eligible to receive incentive stock options. Non-employees may be granted non-qualified stock options. Stock options granted under the 2016 Plan have an exercise price of at least 100% of the fair market value of the underlying stock on the grant date. The stock options have 10 year contractual terms and generally become exercisable for 25% of the option shares one year from the date of grant and then ratably over the following 36 months. Service-based RSUs granted under the equity plans generally vest 25% of the share units covered by the grant on each of the first through fourth anniversaries of the date of the grant, subject to the continued service of the grantee through each such date. However, certain of the outstanding RSUs under our equity plans vest 50% upon the first anniversary year of the grant date, and 50% upon the second anniversary year of the grant date. The Board of Directors has the discretion to use different vesting schedules. As of June 30, 2017, the 2007 plan and the 1998 Plan each continued to remain in effect; however, the Company can no longer grant equity awards under such plans. The following table summarizes the share-based compensation charges included in the Company's consolidated statements of operations and comprehensive loss (in thousands): Years ended June 30, 2017 2016 2015 Cost of revenue $ $ $ Research and development Selling and marketing General and administrative ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The amount of capitalized share-based compensation costs as components of inventory for the years ended June 30, 2017, 2016 and 2015 was insignificant. Stock Options The fair value of each option is estimated at the date of grant using the Black-Scholes option pricing formula with the following assumptions: Years Ended June 30, 2017 2016(1) 2015(1) Risk-free interest rate % — % — % Dividend yield — % — % — % Expected term — — Expected volatility % — % — % (1) The Company did not issue any stock options for the years ended June 30, 2016 and 2015. Determining Fair Value of Stock Options The fair value of each grant of stock options was determined by the Company using the methods and assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment to determine. Valuation and Amortization Method —The Company estimates the fair value of its stock options using the Black-Scholes option-pricing model. This fair value is then amortized over the requisite service periods of the awards. Expected Term —The Company estimates the expected term of stock option by taking the average of the vesting term and the contractual term of the option, as illustrated by the simplified method. Expected Volatility —The expected volatility is derived from the Company's historical stock volatility over a period approximately equal to the expected term of the options. Risk-Free Interest Rate —The risk-free interest rate is based on the U.S. Treasury yield curve on the date of grant. Dividend Yield —The dividend yield assumption is based on the Company's history and expectation of no dividend payouts. A summary of option activity under the Company's Incentive Plan during the fiscal years is presented below (in thousands except per share and term amounts): Options Weighted Weighted Aggregate Balance at June 30, 2014 $ $ Options granted — — Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2015 $ Options granted — — Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2016 $ Options granted Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested or Expected to vest at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Exercisable at June 30, 2017 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the fair value of the Company's common stock on June 30, 2017 of $4.75 and the exercise price of the options that would have been received by option holders if all options exercisable had been exercised on June 30, 2017. The total intrinsic value of options exercised in the years ended June 30, 2017, 2016 and 2015 was approximately $0.1 million, $0.1 million and $1.4 million, respectively. During the years ended June 30, 2017, 2016 and 2015, the Company recognized $0.5 million, $0.8 million and $1.1 million, respectively, of share-based compensation expense for stock options granted to employees. Tax benefits from tax deductions for exercised options and disqualifying dispositions in excess of the deferred tax asset attributable to stock compensation costs for such options are credited to additional paid-in capital. Realized excess tax benefits related to stock options exercises was zero for each of the years ended June 30, 2017, 2016 and 2015. As of June 30, 2017, there was approximately $1.4 million of unrecognized compensation cost net of estimated forfeitures, related to unvested stock options, which is expected to be recognized over a weighted average period of 3.42 years. The following table summarizes information about outstanding and exercisable options at June 30, 2017 (in thousands, except years and exercise price): Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted Weighte Number Weighted $4.00 - 4.01 $ $ $4.23 - 4.94 $5.05 - 5.05 — — $5.38 - 5.68 $5.74 - 6.28 $6.32 - 6.63 $6.75 - 6.82 $6.96 - 6.96 $7.06 - 13.45 $15.22 - 15.22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Outstanding $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Restricted Stock The following table summarizes the activity of RSUs, PSUs and MSUs (in thousands, except fair value per share): Unvested Resstricted Stock Restricted Performance Market Total Weighted Unvested at June 30, 2014 $ Granted Vested ) ) — ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2015 Granted — Vested ) ) ) ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2016 — Granted Vested ) — ) ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2017, there was approximately $26.3 million of unrecognized compensation cost, net of estimated forfeitures, related to restricted stock, which is expected to be recognized over a weighted average period of 2.13 years. Restricted Stock Units The Company recognized $9.5 million, $7.6 million and $7.9 million of share-based compensation expense, net of estimated forfeitures, related to RSUs during the years ended June 30, 2017, 2016 and 2015. The weighted average grant date fair value per share of RSUs was $5.03, $6.01 and $6.79 for the years ended June 30, 2017, 2016 and 2015, respectively. The aggregate fair market value of RSUs that vested during the year ended June 30, 2017 was $7.6 million. Performance Stock Units The Compensation Committee approved the grant of 10,000, zero and 20,000 PSUs to select employees of the Company in the years ended June 30, 2017, 2016 and 2015, respectively. Of these PSUs, zero, 20,000 and 25,000 vested in the years ended June 30, 2017, 2016 and 2015, respectively, due to the achievement of the requisite performance targets while none were cancelled in the years ended June 30, 2017, 2016 and 2015, respectively. The Company recognized zero, $0.04 million, and $0.2 million of share-based compensation expense, net of estimated forfeitures, related to PSUs during the years ended June 30, 2017, 2016, and 2015, respectively. Market Stock Units The Compensation Committee approved the performance equity program, referred to as the market stock unit program, or MSU program, in October 2012. The Company's MSU Program uses the Russell 2000 index as a performance benchmark and requires that the Company's total stockholder return match or exceed that of the Russell 2000. Based on a sliding scale of how much the Company's total stockholder return outperforms the Russell 2000 benchmark, the participating executives can earn up to a maximum of 150% of the target number of shares over two measurement periods. The Company uses a Monte-Carlo simulation to calculate the fair value of the award on the grant date. The Compensation Committee approved the grant of 0.7 million, 0.6 million and 0.5 million MSUs to select employees of the Company in the years ended June 30, 2017, 2016 and 2015, respectively. Of these MSUs, 0.2 million, 0.4 million and 0.5 million vested in the years ending June 30, 2017, 2016 and 2015, respectively, due to the Company's total stockholder return performance against the Russell 2000 index while 0.4 million, 0.1 million and 0.2 million MSUs were cancelled in the years ended June 30, 2017, 2016 and 2015, respectively. The Company recognized $2.5 million, $3.0 million and $3.4 million of share-based compensation expense, net of estimated forfeitures, related to MSUs during the years ended June 30, 2017, 2016 and 2015, respectively. The weighted average grant date fair value per share of MSUs was $5.20, $6.61 and $6.64 for the years ended June 30, 2017, 2016 and 2015, respectively. As of June 30, 2017, there was approximately $2.6 million of unrecognized compensation cost, net of estimated forfeitures, related to MSUs. Employee Stock Purchase Plan Under the Company's Amended and Restated 2007 Employee Stock Purchase Plan, or ESPP, qualified employees are permitted to purchase the Company's common stock at 85% of the lower of the fair market value of the common stock on the commencement date of each offering period or the fair market value on the specified purchase date. The ESPP is deemed compensatory and compensation costs are accounted for under ASC 718, Stock Compensation . Employees' payroll deductions may not exceed 10% of their salaries. Employees may purchase up to 2,500 shares per period provided that the value of the shares purchased in any calendar year may not exceed $25,000, as calculated pursuant to the purchase plan. The Company estimates the fair value of ESPP shares at the date of grant using the Black-Scholes option pricing model. The weighted average assumptions were as follows: Years Ended June 30, 2017 2016 2015 Risk-free interest rate 0.49% - 0.70% 0.51% - 0.70% 0.07% - 0.26% Dividend yield —% —% —% Expected term 0.5 - 1.0 0.5 - 1.0 0.5 - 1.0 Expected volatility 24.6% - 42.0% 33.3% - 49.1% 27.1% - 41.3% The risk-free rate for the expected term of the ESPP option was based on the U.S. Treasury Constant Maturity rate for each offering period; expected volatility was based on the historical volatility of the Company's common stock; and the expected term was based upon the offering period of the ESPP. For the years ended June 30, 2017, 2016 and 2015, the Company recognized $1.2 million, $1.3 million and $1.3 million, respectively, of compensation expense related to its ESPP. The Company issued 0.9 million and 0.7 million shares under the ESPP in fiscal 2017 and 2016, respectively, at a weighted average price per share of $3.84 and $4.92, respectively. As of June 30, 2017, total unrecognized compensation cost related to the ESPP plan was $0.6 million, which the Company expects to recognize over a weighted average period of 0.6 years.

Income Taxes

Income Taxes	12 Months Ended
	Jun. 30, 2017
Income Taxes
Income Taxes	10. Income Taxes Loss before provision for income taxes on the accompanying statements of operations and comprehensive loss included the following components (in thousands): Years Ended June 30, 2017 2016 2015 Domestic $ ) $ ) $ ) Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total worldwide $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The provision for income taxes consisted of the following (in thousands): Years Ended June 30, 2017 2016 2015 Current: Federal $ — $ — $ — State Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total current $ $ $ Deferred: Federal — — — State — — — Foreign ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total deferred ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total provision for income taxes $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income tax payable was $1.2 million, $2.3 million and $0.4 million at June 30, 2017, 2016 and 2015, respectively. A reconciliation of income taxes at the statutory federal income tax rate to the provision for income taxes included in the accompanying consolidated statements of operations and comprehensive loss is as follows (in thousands): Years Ended June 30, 2017 2016 2015 U.S. federal taxes (benefit): At federal statutory rate $ ) $ ) $ ) State tax, net of federal benefit Share-based compensation expense Debt extinguishment — — Other non-deductible permanent items Change in valuation allowance Credits ) ) ) Other — Foreign taxes ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company's net deferred tax assets were as follows (in thousands): June 30, 2017 2016 Deferred tax assets: Federal and state net operating losses $ $ Accrued expenses and reserves Deferred revenue Credits Share-based compensation expense Capitalized research and development Unicap Fixed assets/intangibles ) Other ​ ​ ​ ​ ​ ​ ​ ​ Total deferred tax assets Deferred tax liabilities: Debt discount ) ) Section 481 adjustment ) ) ​ ​ ​ ​ ​ ​ ​ ​ Total deferred tax liabilities ) ) Valuation allowance ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company has not provided for U.S. income taxes on undistributed earnings of its foreign subsidiaries because it intends to permanently re-invest these earnings outside the U.S. The cumulative amount of such undistributed earnings upon which no U.S. income taxes have been provided as of June 30, 2017 was $26.5 million. It is not practicable to determine the income tax liability that might be incurred if these earnings were to be repatriated to the U.S. As of June 30, 2017, the Company had approximately $329.8 million and $154.5 million in federal and state net operating loss carryforwards, respectively. The federal and state carryforwards expire in varying amounts beginning in 2019 for federal and 2018 for state purposes. Such net operating loss carryforwards include excess tax benefits from employee stock option exercises which, in accordance with guidance for income tax accounting, have not been recorded within the Company's deferred tax asset balances. The Company will record approximately $0.9 million as a credit to additional paid-in capital as and when such excess benefits are ultimately realized. In addition, as of June 30, 2017, the Company had federal and state research and development tax credits of approximately $18.6 million and $18.7 million, respectively. The federal research credits will begin to expire in 2019, the California research credits have no expiration date, and the other state research credits began to expire in 2018. Under the Internal Revenue Code ("IRC") Sections 382 and 383, annual use of our net operating loss and research tax credit carryforwards to offset taxable income may be limited based on cumulative changes in ownership. An analysis of the impact of this provision through March 31, 2016 has been performed and it was determined that, although ownership changes had occurred, the carryovers should be available for utilization by the Company before they expire, provided we generate sufficient future taxable income. There were no equity financings in the current fiscal year that would result in an ownership change under Section 382. The Company will continue to monitor the changes in equity that would affect the tax attributes as reported. Based on the available objective evidence and history of losses, the Company has established a 100% valuation allowance against the combined domestic net deferred tax assets of Accuray and TomoTherapy because of uncertainty surrounding the realization of such deferred tax assets. The aggregate changes in the balance of gross unrecognized tax benefits were as follows (in thousands): Years Ended June 30, 2017 2016 2015 Balance at beginning of year $ $ $ Tax positions related to current year: Additions Tax positions related to prior years: Additions Reductions ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at end of year $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The calculation of unrecognized tax benefits involves dealing with uncertainties in the application of complex global tax regulations. Management regularly assesses the Company's tax positions in respect to legislative, bilateral tax treaty, regulatory and judicial developments in the countries in which the Company does business. The reduction in prior year's tax positions primarily relates to lapses of applicable statutes of limitations. The Company anticipates that except for $0.1 million in uncertain tax positions that may be reduced related to the lapse of various statutes of limitation and completion of tax examinations there will be no material changes in uncertain tax positions in the next 12 months. As of June 30, 2017, the amount of gross unrecognized tax benefits was $15.8 million of which $11.9 million would affect the Company's effective tax rate if realized. The Company's practice is to recognize interest and/or penalties related to income tax matters in income tax expense. As of June 30, 2017 and 2016, the Company had approximately $0.2 million and $0.5 million, respectively, of accrued interest and penalties related to uncertain tax positions. The Company files income tax returns in the United States federal, various states and foreign jurisdictions. Due to tax attributes being carried forward and utilized during open years, the statute of limitations remains open for the U.S. federal jurisdiction and domestic states for tax years from 1999 and forward. In the foreign jurisdictions where the Company files income tax returns, the statutes of limitations with respect to these jurisdictions vary from jurisdiction to jurisdiction and range from 4 to 10 years. The material foreign jurisdictions are France, Switzerland, and Japan, whose tax years remain open from 2013, 2008, and 2010, respectively. The Company is also subject to periodic examination of its income tax returns by the Internal Revenue Service (IRS) and other tax authorities, and in some cases the Company has received additional tax assessments which have not been significant. During fiscal year 2017, the Company received tax assessments from the Swiss Vaud Canton tax administration for the 2013, 2015 and 2016 tax periods. The Swiss total assessment of $0.1 million was settled in 2017.

Other Expense, Net

Other Expense, Net	12 Months Ended
	Jun. 30, 2017
Other Expense, Net
Other Expense, Net	11. Other Expense, Net Other expense, net consisted of the following (in thousands): Years Ended June 30, 2017 2016 2015 Interest expense on debt $ ) $ ) $ ) Foreign currency transaction loss ) ) ) Other (expense) income(1) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other expense, net $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Other (expense) income consists of interest income, investment gains and losses, other miscellaneous income and expenses related to extinguishment of debt.

Debt

Debt	12 Months Ended
	Jun. 30, 2017
Debt
Debt	12. Debt MidCap Revolving Credit Facility On June 14, 2017, the Company entered into a credit and security agreement (the "Credit Agreement") by and among the Company, as borrower, TomoTherapy Incorporated, a direct, wholly-owned subsidiary of the Company, as borrower ("TomoTherapy," and together with the Company, the "Borrowers"), any additional borrower that may be added thereto, MidCap Financial Trust ("MidCap"), individually as a lender and as agent ("Agent"), and the other lenders from time to time parties thereto (together with MidCap as a lender, the "Lenders"). The Credit Agreement provides for a revolving credit facility in the initial amount of $52.0 million, which the Company may request be increased by up to $33.0 million to a new total of $85.0 million through additional tranches, each with a $1.0 million minimum (the "Facility"). Neither Agent nor the Lenders have any obligation to consent to activation of an additional tranche. Availability for borrowings under the Facility is subject to a borrowing base that is calculated as a function of the value of the Borrowers' eligible accounts receivable and eligible inventory, and the Borrowers are required to maintain a minimum drawn balance of at least 30% of such availability. The Facility's stated maturity date is June 14, 2021, but the Facility may mature earlier than the stated maturity date if certain conditions set forth in the Credit Agreement are not met, including conditions related to the Company's Existing 3.50% Convertible Notes maturing February 1, 2018. The Borrowers' obligations under the Credit Agreement are secured by first-priority liens on substantially all the assets of the Borrowers, subject to certain exceptions. Interest on the borrowings under the Facility is payable monthly in arrears at an annual interest rate of reserve-adjusted, 90-day LIBOR (subject to a 1.00% floor) plus 4.50%. The Credit Agreement requires the Borrowers to pay Agent a collateral management fee of 0.10% per month on the outstanding balance of the Facility. The Credit Agreement also requires the Borrowers to pay the Lenders an unused line fee equal to 0.5% per annum of the average unused portion of the Facility. If all or a portion of the Lenders' funding obligations under the Credit Agreement terminate for any reason other than as a result of a refinancing of 100% of the loans made under the Facility by Agent and the Lenders, then the Company will be required to pay a fee equal to 3% of the commitment amount terminated if such termination occurs within the first year, 2% of the commitment amount terminated if such termination occurs within the second year, and 1% of the commitment amount terminated if such termination occurs after the second year. The Credit Agreement contains restrictions and covenants applicable to the Company and its subsidiaries. Among other requirements, the Company may not permit the Fixed Charge Coverage Ratio (as defined in the Credit Agreement) to be less than a certain specified ratio for each fiscal quarter during the term of the Facility. The Credit Agreement also contains customary covenants that limit, among other things, the ability of the Company and its subsidiaries to (i) incur 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 Credit Agreement contains customary representations and warranties and events of default. First Lien Senior Secured Term Loan due January 2021 (Secured Loan) On January 11, 2016, the Company closed a $70.0 million first lien senior secured debt financing agreement with Cerberus Business Finance, LLC, an affiliate of Cerberus Capital Management, L.P (the "Secured Loan"). The proceeds of the loan were to be used to retire the 3.75% Convertible Notes at the earlier of August 2016 or when otherwise redeemed. The Secured Loan bore interest at a variable rate per annum equal to, at the Company's option, (i) the LIBOR Rate for one month plus an applicable margin of 7.00% (subject to a LIBOR Rate floor of 1.00% per annum), or (ii) a Reference Rate, which is the higher of 1) 3.25%, 2) Federal Funds Rate plus 0.5%, 3) the LIBOR rate for 1 month plus 1%, and 4) the US Prime Rate as published in the Wall Street Journal, plus an applicable margin of 4.75% per annum. The loan was repayable in consecutive quarterly installments of $875,000 with the final payment due on the final maturity date. The Secured Loan was to mature on the earlier of: (i) January 11, 2021 and (ii) the date that is 120 days prior to the scheduled maturity date of the 3.50% Convertible Notes maturing February 1, 2018 unless the Company had set aside specifically identifiable funds raised from new common equity or new debt equal to the then-outstanding principal amount of the 3.50% Convertible Notes. The net proceeds from the offering, after deducting the initial purchaser's discount and commission and the related offering costs, were approximately $65.5 million. The offering costs of $3.1 million and the initial purchaser's discount and commission of $1.4 million (both of which are recorded in Long-term Debt) were being amortized to interest expense using the effective interest method over five years. The Secured Loan is secured by first-priority liens on substantially all the assets of the Company. The Company could, at its election, repay the Secured Loan at any time and if so, the Company would be required to pay a prepayment premium of 2% if the Secured Loan was repaid or accelerated within the first year on the amount repaid and 1% if the Secured Loan was repaid or accelerated within the second year on the amount repaid. In June 2017, the Company elected to repay the outstanding balance of the Secured Loan in the amount of $60.6 million plus accrued interest of $0.2 million and a prepayment premium of $0.6 million. The remaining offering costs and discount of approximately $2.2 million and $1.3 million, respectively, were charged to interest expense. Accordingly, the Secured Loan was terminated. 3.75% Convertible Senior Notes due August 2016 On August 1, 2011, the Company issued the 3.75% Convertible Notes to certain qualified institutional buyers or QIBs. The 3.75% Convertible Notes were offered and sold to the QIBs pursuant to Rule 144A under the Securities Act of 1933, as amended or Rule 144A. The net proceeds from the $100 million offering, after deducting the initial purchaser's discount and commission and the related offering costs, were approximately $96.1 million. The offering costs and the initial purchaser's discount and commission (which are recorded in Other Assets) were both being amortized to interest expense using the effective interest method over five years. The 3.75% Convertible Notes bore interest at a rate of 3.75% per year, payable semi-annually in arrears in cash on February 1 and August 1 of each year, beginning on February 1, 2012. The 3.75% Convertible Notes would mature on August 1, 2016, unless earlier repurchased, redeemed or converted. The 3.75% Convertible Notes were issued under an Indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee. Holders of the 3.75% Convertible Notes could convert their 3.75% Convertible Notes at any time on or after May 1, 2016 until the close of business on the business day immediately preceding the maturity date. Prior to May 1, 2016, holders of the 3.75% Convertible Notes could convert their 3.75% Convertible Notes only under the following circumstances: (1) during any calendar quarter after the calendar quarter ending September 30, 2011, and only during such calendar quarter, if the closing sale price of the Company's common stock for each of 20 or more trading days in the 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price in effect on the last trading day of the immediately preceding calendar quarter; (2) during the five consecutive business days immediately after any five consecutive trading-day period (such five consecutive trading-day period, the "Note Measurement Period") in which the trading price per $1,000 principal amount of 3.75% Convertible Notes for each trading day of that Note Measurement Period was equal to or less than 98% of the product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day; (3) if the Company called any or all of the 3.75% Convertible Notes for redemption, at any time prior to the close of business on the business day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate transactions as described in the Indenture. Upon conversion by holders of the 3.75% Convertible Notes, the Company would have the right to pay or deliver, as the case may be, cash, shares of common stock of the Company or a combination thereof, at the Company's election. At any time on or prior to the 33rd business day immediately preceding the maturity date, the Company could irrevocably elect to (a) deliver solely shares of common stock of the Company in respect of the Company's conversion obligation or (b) pay cash up to the aggregate principal amount of the 3.75% Convertible Notes to be converted and pay or deliver, as the case may be, cash, shares of common stock of the Company or a combination thereof in respect of the remainder, if any, of the Company's conversion obligation in excess of the aggregate principal amount of the 3.75% Convertible Notes being converted. The initial conversion rate was 105.5548 shares of the Company's common stock per $1,000 principal amount of 3.75% Convertible Notes (which represented an initial conversion price of approximately $9.47 per share of the Company's common stock). The conversion rate, and thus the conversion price, was subject to adjustment as further described below. Holders of the 3.75% Convertible Notes who converted their 3.75% Convertible Notes in connection with a "make-whole fundamental change," as defined in the Indenture, could 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 could require the Company to purchase all or a portion of their 3.75% Convertible Notes at a fundamental change repurchase price equal to 100% of the principal amount of 3.75% Convertible Notes, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. Prior to the maturity date, the Company could redeem for cash all or a portion of the 3.75% Convertible Notes if the closing sale price of its common stock exceeded 130% of the applicable conversion price (the initial conversion price is approximately $9.47 per share of common stock) of such 3.75% Convertible Notes for at least 20 trading days during any consecutive 30 trading-day period (including the last trading day of such period). In accordance with ASC 470-20, the Company separately accounted for the liability and equity conversion components of the 3.75% Convertible Notes. The principal amount of the liability component of the 3.75% Convertible Notes was $75.9 million as of the date of issuance based on the present value of its cash flows using a discount rate of 10%, our approximate borrowing rate at the date of the issuance for a similar debt instrument without the conversion feature. The carrying value of the equity conversion component was $24.1 million. A portion of the initial purchaser's discount and commission and the offering costs totaling $0.9 million was allocated to the equity conversion component. The liability component was being accreted to the principal amount of the 3.75% Convertible Notes using the effective interest method over five years. In January 2016, the Company repurchased approximately $63.4 million in aggregate principal amount of its 3.75% Convertible Senior Notes due August 2016 for $66.6 million in cash. As $63.4 million of the 3.75% Convertible Senior Notes were settled in cash, a total of 6.7 million potentially dilutive shares were no longer potentially outstanding from a net loss per share perspective, these shares were already noted in Note 2 above as being excluded due to being anti-dilutive in the fiscal year 2016. The Company recorded a charge in the third quarter of fiscal 2016 of approximately $1.0 million associated with the repurchase of the notes. In August 2016, the Company settled the remaining 3.75% Convertible Senior Notes for approximately $36.6 million aggregate principal amount and $0.7 million accrued interest for approximately $37.3 million in cash. 3.50% Convertible Senior Notes due February 2018 In February 2013, the Company issued $115.0 million aggregate principal amount of its 3.50% Convertible Notes to certain QIBs. The 3.50% Convertible Notes were offered and sold to the QIBs pursuant to Rule 144A. The net proceeds from the offering, after deducting the initial purchaser's discount and commission and the related offering costs, were approximately $110.5 million. The offering costs and the initial purchaser's discount and commission (which are recorded in Other Assets) are both being amortized to interest expense using the effective interest method over five years. The 3.50% Convertible Notes bear interest at a rate of 3.50% per year, payable semi-annually in arrears in cash on February 1 and August 1 of each year, which began on August 1, 2013. The 3.50% Convertible Notes will mature on February 1, 2018, unless earlier repurchased, redeemed or converted. In April 2014, through a series of transactions, the Company refinanced approximately $70.3 million aggregate principal amount of the 3.50% Convertible Notes with approximately $70.3 million aggregate principal amount of the Company's new 3.50% Series A Convertible Senior Notes due 2018 (the "3.50% Series A Convertible Notes"). The 3.50% Convertible Notes were issued 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 may convert their 3.50% Convertible Notes at any time until the close of business on the business day immediately preceding the maturity date. The 3.50% Convertible Notes are convertible, as described below into common stock of the Company at an initial conversion rate equal to 187.6877 shares of common stock per $1,000 principal amount of the 3.50% Convertible Notes, which is equivalent to a conversion price of approximately $5.33 per share of common stock, subject to adjustment. Holders of the 3.50% Convertible Notes who convert their 3.50% Convertible 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 3.50% Convertible Notes may require the Company to purchase all or a portion of their 3.50% Convertible Notes at a fundamental change repurchase price equal to 100% of the principal amount of 3.50% Convertible Notes, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. In accordance with guidance in ASC 470-20, Debt with Conversion and Other Options and ASC 815-15, Embedded Derivatives , the Company determined that the embedded conversion components of the 3.50% Convertible Note do not require bifurcation and separate accounting. The remaining $44.7 million principal amount of the 3.50% Convertible Notes has been recorded in short-term debt on the consolidated balance sheet as of June 30, 2017. 3.50% Series A Convertible Senior Notes due February 2018 On April 17, 2014, the Company entered into note exchange agreements with certain holders (the "Participating Holders") of the 3.50% Convertible Notes to refinance approximately $70.3 million aggregate principal amount of the 3.50% Convertible Notes with approximately $70.3 million aggregate principal amount of the 3.50% Series A Convertible Notes. Pursuant to the note exchange agreements, the Company also paid the Participating Holders an aggregate of approximately $0.4 million in cash in connection with such transactions. The principal amount of 3.50% Convertible Notes refinanced for each $1,000 principal amount of the 3.50% Series A Convertible Notes was $1,000 and the amount in cash paid per $1,000 principal amount of such 3.50% Convertible Notes delivered was determined in individual negotiations between the Company and each Participating Holder. The Series A Convertible Notes have the same interest rate, maturity and other terms as the 3.50% Convertible Notes, except that the 3.50% Series A Convertible Notes are convertible into cash, shares of the Company's common stock or a combination of cash and shares of common stock, at the Company's option. The 3.50% Series A Convertible Notes were issued 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 may convert their Securities at any time on or after November 1, 2017 until the close of business on the business day immediately preceding the maturity date. Prior to November 1, 2017, holders of the 3.50% Series A Convertible Notes may convert their Securities only under the following circumstances: (1) during any calendar quarter after the calendar quarter ending September 30, 2014, and only during such calendar quarter, if the closing sale price of the Company's common stock for each of 20 or more trading days in the 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price in effect on the last trading day of the immediately preceding calendar quarter; (2) during the five consecutive business days immediately after any five consecutive trading-day period (such five consecutive trading-day period, the "Note Measurement Period") in which the trading price per $1,000 principal amount of 3.50% Series A Convertible Notes for each trading day of that Securities Measurement Period was equal to or less than 98% of the product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day; or (3) upon the occurrence of specified corporate transactions as described in the Indenture. Upon conversion by holders of the 3.50% Series A Convertible Notes, the Company will have the right to pay or deliver, as the case may be, cash, shares of common stock of the Company or a combination thereof, at the Company's election. At any time on or prior to the 17th business day immediately preceding the maturity date, the Company may irrevocably elect to (a) deliver solely shares of common stock of the Company in respect of the Company's conversion obligation or (b) pay cash up to the aggregate principal amount of the 3.50% Series A Convertible Notes to be converted and pay or deliver, as the case may be, cash, shares of common stock of the Company or a combination thereof in respect of the remainder, if any, of the Company's conversion obligation in excess of the aggregate principal amount of the 3.50% Series A Convertible Notes being converted. The initial conversion rate is 187.6877 shares of the Company's common stock per $1,000 principal amount of 3.50% Series A Convertible Notes (which represents an initial conversion price of approximately $5.33 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 3.50% Series A 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 3.50% Series A Convertible Notes may require the Company to purchase all or a portion of their 3.50% Convertible Notes at a fundamental change repurchase price equal to 100% of the principal amount of the 3.50% Series A Convertible Notes, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. In accordance with Accounting Standards Codification, or ASC 470-20, Debt with Conversion and Other Options , the Company separately accounts for the liability and equity conversion components of the 3.50% Series A Convertible Notes. The principal amount of the liability component of the 3.50% Series A Convertible Notes was $62.5 million as of the date of issuance based on the present value of its cash flows using a discount rate of 7%, our approximate borrowing rate at the date of the issuance for a similar debt instrument without the conversion feature. The carrying value of the equity conversion component was $7.9 million. In addition, the portion of the cash amount paid to the Participating Holders totaling $0.4 million was allocated to the debt discount with the remaining $47,000 to the equity component. The liability component is being accreted to the principal amount of the 3.50% Series A Convertible Notes using the effective interest method through the maturity in February 2018. The following table presents the carrying values of all Convertible Notes and notes issued pursuant to the Revolving Credit Facility (collectively, "Notes") as of June 30, 2017 (in thousands): Revolving 3.50% 3.50% Total Carrying amount of equity conversion component $ — $ — $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal amount of the Notes $ $ $ $ Unamortized debt costs — ) — ) Unamortized debt discount — — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net carrying amount $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2017, the remaining period over which the unamortized debt discount of the of the 3.50% Series A Convertible Notes is 7 months using an effective interest rate of 7.10%. A summary of interest expense on the Notes is as follows (in thousands): Year ended June 30, 2017(1) 2016 2015 Interest expense related to contractual interest coupon $ $ $ Interest expense related to amortization of debt discount Interest expense related to amortization of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Debt issuance costs were higher in fiscal year 2017 due to the repayment of the Secured Loan and the write-off of the related debt issuance costs.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Jun. 30, 2017
Employee Benefit Plan
Employee Benefit Plan	13. Employee Benefit Plan The Company's employee savings and retirement plan is qualified under Section 401(k) of the United States Internal Revenue Code. Employees may make voluntary, tax-deferred contributions to the 401(k) Plan up to the statutorily prescribed annual limit. The Company makes discretionary matching contributions to the 401(k) Plan on behalf of employees up to the limit determined by the Board of Directors. The Company contributed $2.0 million, $2.1 million and $2.3 million to the 401(k) Plan during the years ended June 30, 2017, 2016 and 2015, respectively.

Defined Benefit Pension Obligat

Defined Benefit Pension Obligation	12 Months Ended
	Jun. 30, 2017
Defined Benefit Pension Obligation
Defined Benefit Pension Obligation	14. Defined Benefit Pension Obligation The Company has established a defined pension plan for its employees in its Switzerland subsidiary. The plan provides benefits to employees upon retirement, death or disability. The Company uses June 30 as the year-end measurement date for this plan. The unfunded liability of $2.7 million was recognized in long-term other liabilities in the accompanying balance sheet as of June 30, 2017. Actuarial gain of $0.9 million was recognized in other comprehensive loss in fiscal 2017. Obligations and Funded Status The following table presents the funded status of the defined benefit pension plan (in thousands): June 30, 2017 2016 Change in benefit obligation: Benefit obligation—beginning of fiscal year $ $ Service cost Interest cost Plan participants' contributions Plan amendment — ) Actuarial (gain) loss ) Foreign currency changes ) Benefit and expense payments ) ) ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation—end of fiscal year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in plan assets: Plan assets—beginning of fiscal year $ $ Employer contributions Actual return on plan assets Plan participants' contributions Foreign currency changes ) Benefit and expense payments ) ) ​ ​ ​ ​ ​ ​ ​ ​ Plan assets—end of fiscal year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Funded status $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amounts recognized within the consolidated balance sheets: Assets $ — $ — Long-term other liabilities ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net amount recognized $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents the amounts recognized in accumulated other comprehensive loss (before tax) for the defined benefit pension plan (in thousands): June 30, 2017 2016 Net loss $ ) $ ) Prior service cost (credit) ) ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive loss $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for this defined benefit pension plan where accumulated benefit obligation exceeded the fair value of plan assets (in thousands): June 30, 2017 2016 Projected benefit obligation $ $ Accumulated benefit obligation $ $ Fair value of plan assets $ $ Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss The following table shows the components of the Company's net periodic benefit costs and the other amounts recognized in other comprehensive loss, before tax, related to the Company's defined benefit pension plan (in thousands): Year ended June 30, 2017 2016 2015 Net Periodic Benefit Costs: Service cost $ $ $ Interest cost Expected returns on assets ) ) ) Amortization of prior service cost (credit) ) — — Amortization of net loss ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net periodic benefit costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other Amounts Recognized in Other Comprehensive Loss: Net (gain) loss arising during the year ) Prior service cost (credit) ) — Amortization of net (gain) loss ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total recognized in other comprehensive loss ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total recognized in net periodic benefit costs and other comprehensive loss $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2018 related to the Company's defined benefit pension plan are as follows (in thousands): 2018 Net loss $ Prior service cost (credit) ) ​ ​ ​ ​ ​ Accumulated other comprehensive loss $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assumptions The assumptions used to determine net periodic benefit cost and to compute the expected long-term return on assets for the Company's defined benefit pension plan were as follows: Fiscal Years 2017 2016 2015 Net Periodic Benefit Costs: Discount rate % % % Rate of compensation increase % % % Expected long-term return on assets % % % The assumptions used to measure the benefit obligation for the Company's defined benefit pension plan were as follows: June 30, 2017 2016 Benefit Obligation: Discount rate % % Rate of compensation increase % % Estimated Contributions and Future Benefit Payments The Company made contributions of approximately $1.3 million, $1.2 million and $1.2 million to the defined benefit pension plan during fiscal years 2017, 2016 and 2015 respectively. The Company expects total contributions to the defined benefit pension plan for fiscal year 2018 will be approximately $1.2 million. Estimated future benefit payments to the defined benefit pension plan at June 30, 2017 were as follows (in thousands): Year Ending June 30, Future 2018 $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Plan Assets The plan assets are invested in insurance contracts with Swiss Life Foundation BVG (BVG) insurance company based in Zurich, Switzerland at the end of fiscal year 2016 and 2017 and are expected to be invested 100% in insurance contracts in fiscal 2018, which are reinsured by Swiss Life Ltd (SLL). SLL invests the vested pension capital and provides a 100% capital and interest rate guarantee as negotiated by the Company. In 2017, the Company negotiated a guaranteed interest rate of 1.25% for mandatory retirement savings and 0.75% for supplementary retirement savings. The pension plan is entitled to an annual bonus from the SLL comprising the effective savings, risk and cost results. The technical administration and management of the savings account are guaranteed by the SLL on behalf of BVG. Insurance benefits due are paid directly to the entitled persons by the SLL in the name of and for the account of the collective foundation. The Company has committed itself to pay the annual contributions and costs due under the pension fund regulations. The contract of affiliation between the Company and BVG can be terminated by either side. In the event of a termination, recipients of retirement and survivors' benefits would remain with the collective foundation. The Company commits itself to transfer its active insured members and recipients of disability benefits to the new employee benefits institution, thus releasing BVG from all obligations.

Segment Disclosure

Segment Disclosure	12 Months Ended
	Jun. 30, 2017
Segment Disclosure
Segment Disclosure	15. Segment Disclosure The Company has one operating and reporting segment (oncology systems group), which develops, manufactures and markets proprietary medical devices used in radiation therapy 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. Therefore, the information below is presented only for revenues and long-lived tangible assets by geographic areas. Revenues attributed to a country or region is based on the shipping addresses of the Company's customers. The following summarizes revenue by geographic region (in thousands): Years ended June 30, 2017 2016 2015 Americas $ $ $ Europe, Middle East, India and Africa Asia Pacific Japan ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Information regarding geographic areas in which the Company has long-lived tangible assets is as follows (in thousands): June 30, June 30, Americas $ $ Europe, Middle East, India and Africa Asia Pacific (excluding Japan and India) Japan ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Restructuring Charges

Restructuring Charges	12 Months Ended
	Jun. 30, 2017
Restructuring Charges
Restructuring Charges	16. Restructuring Charges As part of the Company's plan to enhance operational performance through productivity initiatives, the Company implemented a re-alignment of its workforce during the fourth quarter of fiscal year 2016. The re-alignment affected approximately 3% of the Company's total workforce. The Company incurred approximately zero, $2.5 million and $1.4 million in restructuring charges in connection with its workforce re-alignment for the years ended June 30, 2017, 2016, and 2015. These restructuring charges are included in cost of goods sold and operating expenses in the consolidated statements of operations. The Company had no accrued restructuring charges in the consolidated balance sheets as of June 30, 2017. As of June 30, 2016, the Company had approximately $2.5 million in accrued restructuring charges included in accrued compensation in the consolidated balance sheets.

Quarterly Financial Data (unaud

Quarterly Financial Data (unaudited)	12 Months Ended
	Jun. 30, 2017
Quarterly Financial Data (unaudited)
Quarterly Financial Data (unaudited)	17. Quarterly Financial Data (unaudited) The following table provides the selected quarterly financial data for fiscal 2017 and 2016 (in thousands, except net income (loss) per share amounts: Quarters ended September 30, December 31, March 31, June 30, Net revenue $ $ $ $ Gross profit $ $ $ $ Net loss $ ) $ ) $ ) $ ) Net loss per share—basic and diluted $ ) $ ) $ ) $ ) Shares used in basic and diluted per share calculation Quarters ended September 30, December 31, March 31, June 30, Net revenue $ $ $ $ Gross profit $ $ $ $ Net income (loss) $ ) $ ) $ $ ) Net income (loss) per share—basic $ ) $ ) $ $ ) Net income (loss) per share—diluted $ ) $ ) $ $ ) Shares used in basic per share calculation Shares used in diluted per share calculation

Subsequent Event

Subsequent Event	12 Months Ended
	Jun. 30, 2017
Subsequent Event
Subsequent Event	18. Subsequent Event On August 7, 2017, the Company issued $85.0 million aggregate principal amount of 3.75% Convertible Senior Notes consisting of (i) $53.0 million aggregate principal amount of 3.75% Convertible Senior Notes to certain holders of the Company's outstanding Existing 3.50% Convertible Notes (the "Exchange Participants") in exchange for approximately $47.0 million aggregate principal amount of such holders' Existing 3.50% Convertible Notes and (ii) $32.0 million aggregate principal amount of 3.75% Convertible Senior Notes to certain other qualified new investors for cash. The net proceeds of the cash issuance were used to repurchase approximately $28.0 million of additional Existing 3.50% Convertible Notes from the Exchange Participants. Immediately following such transactions, approximately $40.0 million aggregate principal amount of the Existing 3.50% Convertible Notes remained outstanding.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jun. 30, 2017
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). The 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. Long-term accounts receivable that were previously reported in prepaid expenses and other assets in prior year's consolidated statements of cash flows have been reclassified to accounts receivable, short and long-term to conform to the current year's presentation. These reclassifications had no impact on previously reported net cash provided by (used in) operating activities in consolidated statements of cash flows for the years ended June 30, 2016 and 2015.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures at the date of the financial statements. Key estimates and assumptions made by the Company relate to revenue recognition, assessment of recoverability of goodwill and intangible assets, valuation of inventories, share-based compensation expense, convertible notes, income taxes, allowance for doubtful accounts and loss contingencies. Actual results could differ materially from those estimates.
Foreign Currency	Foreign Currency The Company's international subsidiaries use their local currencies as their functional currencies. For those subsidiaries, assets and liabilities are translated at exchange rates in effect at the balance sheet date and income and expense accounts at the average exchange rate. Resulting translation adjustments are excluded from the determination of net loss and are recorded in accumulated other comprehensive loss as a separate component of stockholders' equity. Net foreign currency exchange transaction gains or losses are included as a component of other expense, net, in the Company's consolidated statements of operations and comprehensive loss.
Fair Value Measurements	Fair Value Measurements The carrying values of the Company's financial instruments including cash equivalents, restricted cash, accounts receivable and accounts payable are approximately equal to their respective fair values due to the relatively short-term nature of these instruments. Also refer to Note 5, Financial Instruments, for further details.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers currency on hand, demand deposits, time deposits, and all highly liquid investments with an original maturity of three months or less at the date of purchase to be cash and cash equivalents. Cash and cash equivalents are held in various financial institutions in the United States and internationally.
Investments	Investments The Company classifies all its investments as available-for-sale at the time of purchase since it is management's intent that these investments be available for current operations, and as such, includes these investments as short-term investments on its balance sheets. These investments primarily consist of commercial paper, U.S. treasury securities, and U.S. government agency and corporate debt securities. Short-term 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), as a separate component of stockholders' equity. Realized gains and losses on the sale of securities are determined by specific identification of each security's cost basis. The Company regularly reviews its investment portfolio to determine if any security is other-than-temporarily impaired, which would require it to record an impairment charge in the period any such determination is made. In making this judgment, management evaluates, among other things, the duration and extent to which the fair value of a security is less than its cost, the financial condition of the issuer and any changes thereto, and management's intent to sell, or whether it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. Other expense, net, includes interest, dividends, amortization of purchase premiums and discounts, realized gains and losses on sales of securities and other-than-temporary declines in the fair value of securities, if any.
Concentration of Credit Risk and Other Risks and Uncertainties	Concentration of Credit Risk and Other Risks and Uncertainties The Company's cash and cash equivalents are mainly deposited with several major financial institutions. At times, deposits in these institutions exceed the amount of insurance provided on such deposits. The Company has not experienced any losses in such accounts and believes that it is not exposed to any significant risk on these balances. The Company has placed its investments with high-credit quality issuers. The Company does not invest an amount exceeding 5% of its combined cash, cash equivalents and investments in the securities of any one obligor or maker, except for obligations of the United States government, obligations of United States government agencies and money market accounts. One customer represented more than 10% of total net revenue for the year ended June 30, 2016 and no customer represented 10% or more of total net revenue for the years ended June 30, 2017 and 2015. Two customers accounted for 30% of accounts receivable, net as at June 30, 2017 and one customer accounted for 18% of accounts receivable, net at June 30, 2016. The Company performs ongoing credit evaluations of its customers and maintains reserves for potential credit losses. Accounts receivable are deemed past due in accordance with the contractual terms of the agreement. Accounts are charged against the allowance for doubtful accounts once collection efforts are unsuccessful. Historically, such losses have been within management's expectations. Single-source suppliers presently provide the Company with several components. In most cases, if a supplier was unable to deliver these components, the Company believes that it would be able to find other sources for these components subject to any regulatory qualifications, if required.
Restricted Cash	Restricted Cash Restricted cash primarily consists of cash that is temporarily held in bank accounts which are under the control of the lender to the Revolving Credit Facility, certificates of deposit held as guarantees in connection with customer contracts and corporate leases as well as funds held as guarantees for Value-Added Tax (VAT) obligations in a foreign jurisdiction.
Inventories	Inventories Inventories are stated at the lower of cost (on a first-in, first-out basis) or market value. Excess and obsolete inventories are written down based on historical sales and forecasted demand, as judged by management.
Revenue Recognition	Revenue Recognition The Company's revenue is primarily derived from sales of CyberKnife and TomoTherapy Systems and services, which include post-contract customer support or PCS, installation services, training and other professional services. The Company records its revenues net of any value added or sales tax. In all sales arrangements, the Company recognizes revenues when there is persuasive evidence of an arrangement, the fee is fixed or determinable, collection of the fee is reasonably assured and delivery has occurred. Payments received in advance of system shipment are recorded as customer advances and are recognized as revenue or deferred revenue upon product shipment or installation. The Company assesses the probability of collection based on a number of factors, including past transaction history with the customer and credit-worthiness of the customer. The Company generally does not request collateral from its customers. If the Company determines that collection is not reasonably assured, the Company will defer the fee and recognize revenue upon receipt of cash. The Company frequently enters into sales arrangements that contain multiple elements or deliverables. For sale arrangements that contain multiple elements, the Company allocates the arrangement consideration to each element based on the relative selling price method, whereby the relative selling price of each deliverable is determined using vendor specific objective evidence (VSOE) of fair value, if it exists. VSOE of fair value for each element is based on the Company's standard rates charged for the product or service when such product or service is sold separately or based upon the price established by the Company's pricing committee when that product or service is not yet being sold separately. When the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements, which may be due to the Company infrequently selling each element separately, not pricing products within a narrow range, or only having a limited sales history, the Company attempts to estimate the selling price of each element based on third-party evidence of selling price (TPE), as determined based on competitors' or third-party vendors' prices for similar deliverables when sold separately. When the Company is not able to establish selling price using VSOE or TPE, the Company uses its best estimate of selling price (BESP), in its allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for a product or service by considering multiple factors including, but not limited to, pricing practices, internal costs, geographies and gross margin. The determination of BESP is made through annual analysis of the Company's pricing practices and adjusted if necessary. The Company has a limited number of software offerings which are not required to deliver its systems' essential functionality and can be sold separately. The Company accounts for the separate sale of its software products in accordance with the applicable guidance for software revenue recognition. The Company's multiple-element arrangements may also include software deliverables that are subject to the software revenue recognition guidance; and in these cases, the revenue for these multiple-element arrangements is allocated to the software deliverable and the non-software deliverables based on the relative selling prices of all of the deliverables in the arrangement using VSOE, TPE or BESP. The Company regularly reviews VSOE, TPE and BESP for all of its products and services. As the Company's go-to-market strategies and other factors change, the Company may modify its pricing practices in the future, which may impact the selling prices of systems and services as well as VSOE, TPE and BESP of systems and services. As a result, the Company's future revenue recognition for multiple element arrangements could differ materially from that recorded in the current period. Product Revenue The majority of product revenue is generated from sales of CyberKnife and TomoTherapy systems. If the Company is responsible for installation, the Company recognizes revenue after installation and acceptance of the system. Otherwise, revenue is generally recognized upon delivery, assuming all other revenue recognition criteria are met. The Company could sell its systems with PCS contracts, installation services, training, and at times, professional services. PCS contracts provide planned and corrective maintenance services, software updates, bug fixes, as well as call-center support. The Company records revenues from sales of systems, product upgrades and accessories to distributors depending on the terms of the distribution agreement as well as terms and conditions executed for each sale, and once all revenue recognition criteria have been met. The Company's agreements with customers and distributors for system sales generally do not contain product return rights. Certain distributor agreements include parts inventory buy-back provisions upon distributorship termination. The Company accrues an inventory buy-back liability when and if such distributorship termination is expected and the liability can be estimated. Service Revenue Service revenue is generated primarily from PCS (warranty period services and post warranty services), installation services, training, and professional services. Service revenue is recognized either ratably over the contractual period or when service is performed, depending on specific terms and conditions in agreements with customers. Costs associated with service revenue are expensed when incurred, except when those costs are related to system upgrades purchased within a service contract. In those cases, the costs of such upgrades are recognized at the time the upgrade revenue is recognized.
Deferred Revenue and Deferred Cost of Revenue	Deferred Revenue and Deferred Cost of Revenue Deferred revenue consists of deferred product revenue and deferred service revenue. Deferred product revenue arises from timing differences between the shipment of product and satisfaction of all revenue recognition criteria consistent with the Company's revenue recognition policy. Deferred service revenue results from the advance payment for services to be delivered over a period of time. Deferred cost of revenue consists of the direct costs associated with the manufacturing of units and direct service upgrade costs for which the revenue has been deferred in accordance with the Company's revenue recognition policies. Deferred revenue and associated deferred cost of revenue expected to be realized within one year are classified as current liabilities and current assets, respectively.
Customer Advances	Customer Advances Customer advances represent payments made by customers in advance of product shipment.
Property and Equipment	Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are depreciated on a straight-line basis over the remaining term of the lease or the estimated useful life of the asset, whichever is shorter. Machinery and equipment are depreciated over five years. Furniture and fixtures are depreciated over four years. Computer and office equipment and computer software are depreciated over three years. Repairs and maintenance costs, which are not considered improvements and do not extend the useful life of the property and equipment, are expensed as incurred.
Software Capitalization Costs	Software Capitalization Costs Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. No costs associated with the development of software have been capitalized as the Company believes its current software development process is essentially completed concurrent with the establishment of technological feasibility.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews long-lived assets, including intangible assets, property and equipment, for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable using pretax undiscounted cash flows. Impairment, if any, is measured as the amount by which the carrying value of a long-lived asset exceeds its fair value.
Goodwill and Purchased Intangible Assets	Goodwill and Purchased Intangible Assets Goodwill is not amortized, but is evaluated for impairment on an annual basis and when impairment indicators are present. The Company has assessed that it has one operating segment and one reporting unit, and the consolidated net assets, including existing goodwill and other intangible assets, are considered to be the carrying value of the reporting unit. The Company estimates the fair value of the reporting unit based on the Company's closing stock price on the trading day closest to the annual review date multiplied by the outstanding shares on that date. If the carrying value of the reporting unit is in excess of its fair value, an impairment may exist, and the Company must perform the second step of the analysis, in which the implied fair value of the goodwill is compared to its carrying value to determine the impairment charge, if any. If the estimated fair value of the reporting unit exceeds the carrying value of the reporting unit, goodwill is not impaired and no further analysis is required. There was no impairment of goodwill identified in the fiscal years ended June 30, 2017, 2016 and 2015. Purchased intangible assets other than goodwill, including developed technology are amortized on a straight-line basis over their estimated useful lives unless their lives are determined to be indefinite. Purchased intangible assets are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets which range from approximately one to seven years. Acquisition-related expenses and restructuring costs are recognized separately from the business combination and are expensed as incurred.
Shipping and Handling	Shipping and Handling The Company's billings for shipping and handling for product shipments to customers are included in cost of products. Shipping and handling costs incurred for inventory purchases are capitalized in inventory and expensed in cost of products.
Advertising Expenses	Advertising Expenses The Company expenses the costs of advertising and promoting its products and services as incurred. Advertising expenses were approximately $0.4 million, $0.3 million and $0.5 million for the years ended June 30, 2017, 2016 and 2015, respectively.
Research and Development Costs	Research and Development Costs Costs related to research, design and development of products are charged to research and development expense as incurred. These costs include direct compensation, benefits, and other headcount related costs for research and development personnel; costs for materials used in research and development activities; costs for outside services and allocated portions of facilities and other corporate costs. The Company has entered into research and clinical study arrangements with selected hospitals, cancer treatment centers, academic institutions and research institutions worldwide. These agreements support the Company's internal research and development capabilities.
Share-Based Compensation	Share-Based Compensation The Company issues stock-based compensation awards to employees and directors in the form of stock options, restricted stock units (RSUs), performance stock units (PSUs), market stock units (MSUs) and employee stock purchase plan (ESPP) awards (collectively, awards). The Company measures and recognizes compensation expense for all stock-based awards based on the awards' fair value. Share-based compensation for RSUs and PSUs is measured based on the value of the Company's common stock on the grant date. The Company uses the Monte-Carlo simulation model to estimate the fair value of MSUs. Share-based compensation for employee stock options and ESPP awards are measured on the date of grant using a Black-Scholes option pricing model. Awards vest either on a graded schedule or in a lump sum. The Company determines the fair value of each award as a single award and recognizes the expense on a straight-line basis over the service period of the award, which is generally the vesting period. The exercise price of stock options granted is equal to the fair market value of the Company's common stock on the date of grant. Stock options expire ten years from the date of grant. Share-based compensation expense for stock options, RSUs, PSUs and the ESPP is based on awards ultimately expected to vest, and the expense is recorded net of estimated forfeitures. The Company recognizes expense for MSUs net of estimated forfeitures and does not adjust the expense for subsequent changes in the expected outcome of the market-based vesting conditions.
Loss Contingencies	Loss Contingencies The Company is involved in various lawsuits, claims and proceedings that arise in the ordinary course of business. The Company records a provision for a liability when it believes that it is both probable that a liability has been incurred and the amount can be reasonably estimated. Significant judgment is required to determine both probability and the estimated amount. The Company reviews these provisions quarterly and adjusts these provisions to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and updated information.
Net Loss Per Common Share	Net Loss Per Common Share Basic and diluted net loss per share is computed by dividing net loss attributable to stockholders by the weighted average number of common shares outstanding during the year. A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share attributable to stockholders follows (in thousands): Years ended June 30, 2017 2016 2015 Numerator: Net loss used to compute basic and diluted loss per share $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Denominator: Weighted average shares used to compute basic and diluted loss per share ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The potentially dilutive shares of the Company's common stock resulting from the assumed exercise of outstanding stock options, the vesting of Restricted Stock Units (RSU), Market Stock Units (MSU) and Performance Stock Units (PSU), and the purchase of shares under the 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 3.75% Convertible Senior Notes due August 2016 (the "3.75% Convertible Notes"), the 3.50% Convertible Senior Notes due February 1, 2018 (the "3.50% Convertible Notes"), the 3.50% Series A Convertible Notes (the "3.50% Series A Convertible Notes") due February 1, 2018 (together, the "Existing 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 June 30, 2017 2016 2015 Stock options RSUs, PSUs and MSUs 3.50% Convertible Notes 3.50% Series A Convertible Notes — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding Convertibles Notes—Diluted Share Impact The 3.75% Convertible Notes and 3.50% Series A Convertible Notes have an optional physical (share), cash or combination settlement feature and contain certain conditional conversion features. Due to the optional cash settlement feature and management's intent to settle the principal amount thereof in cash, the conversion shares underlying the outstanding principal amount of the 3.75% Convertible Notes and 3.50% Series A Convertible Notes, totaling approximately 3.9 million shares and 13.2 million shares, respectively, were not included in the potentially diluted share count table above. The Company's average stock price did not exceed the conversion price of the 3.75% Convertible Notes as of June 30, 2016 and 2015. The number of premium shares included in the Company's diluted share count will vary with fluctuations in the Company's share price. Higher actual share prices result in a greater number of premium shares.
Income Taxes	Income Taxes The Company is required to estimate its income taxes in each of the tax jurisdictions in which it operates prior to the completion and filing of tax returns for such periods. This process involves estimating actual current tax expense together with assessing temporary differences in the treatment of items for tax purposes versus financial accounting purposes that may create net deferred tax assets and liabilities. The Company accounts for income taxes under the asset and liability method, which requires, among other things, that deferred income taxes be provided for temporary differences between the tax bases of the Company's assets and liabilities and their financial statement reported amounts. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses, research and development credit carryforwards and other deferred tax assets. The Company records a valuation allowance to reduce its deferred tax assets to the amount the Company believes is more likely than not to be realized. Because of the uncertainty of the realization of the deferred tax assets, the Company has recorded a full valuation allowance against its domestic and certain foreign net deferred tax assets. The calculation of unrecognized tax benefits involves dealing with uncertainties in the application of complex global tax regulations. Management regularly assesses the Company's tax positions in light of legislative, bilateral tax treaty, regulatory and judicial developments in the countries in which the Company does business. The Company anticipates that except for $0.1 million in uncertain tax positions that may be reduced related to the lapse of various statutes of limitation, there will be no material changes in uncertain tax positions in the next 12 months.
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of comprehensive loss consist of net loss, unrealized gains and losses on available-for-sale investments, changes in foreign currency exchange rate translation and net changes related to a defined benefit pension plan. The unrealized gains and losses on available-for-sale investments, changes in foreign currency exchange rate translation and net changes related to the defined benefit pension plan are excluded from earnings and reported as a component of stockholders' equity. The foreign currency translation adjustment results from those subsidiaries not using the United States 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 at the current exchange rates at the end of each period. The resulting cumulative translation adjustments are recorded directly to the accumulated other comprehensive loss account in stockholders' equity. Revenues and expenses are translated at average exchange rates in effect during the period.
Recent Accounting Standard Updates Not Yet Effective
Accounting Standard Updates	Recent Accounting Standards Update Not Yet Effective In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 if its fiscal year 2019 and early adoption is permitted in any interim reporting period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements. 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 early adoption is permitted as of the beginning of an annual reporting period. The Company 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 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other Topics (Topic 350)—Simplifying the Test for Goodwill Impairment. This guidance eliminates the requirement to calculate the implied fair value of goodwill of a reporting unit by determining the fair value of its assets and liabilities (including unrecognized assets and liabilities) to measure a goodwill impairment charge. Instead, an entity will record an impairment charge based on the excess of the reporting unit's carrying amount over its fair value. The ASU will be effective for the Company in the first quarter of its fiscal year 2021 on a prospective basis and earlier adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company 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 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 ASU will be effective for the Company in the first quarter of its fiscal year 2019 and early adoption is permitted. The Company 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 June 2016, the FASB issued ASU No. 2016-13 (ASU 2016-13) Measurement of Credit Losses on Financial Instruments . ASU 2016-13 requires measurement and recognition of expected credit losses for financial assets held. This guidance will become effective for the Company beginning in the third quarter of fiscal year 2020 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted beginning in the third quarter of fiscal year 2019. The Company has not yet determined whether it will elect early adoption and is evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) (ASU 2016-09). 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. The amendments in this standard are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. Effective July 1, 2017, the Company has elected to continue the use of its forfeiture estimation method for share-based payment awards. The Company's adoption of this guidance will not have a significant impact on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). 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 U.S. 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. ASU 2016-02 requires additional disclosures. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. ASU 2016-02 requires adoption based upon a modified retrospective transition approach. Early adoption is permitted. The Company is currently evaluating the impact of the pending adoption of ASU 2016-02 on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01 (ASU 2016-01) Recognition and Measurement of Financial Assets and Financial Liabilities . ASU 2016-01 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 become effective for the Company beginning in the third quarter of fiscal year 2018 and must be adopted using a modified retrospective approach, with certain exceptions. Early adoption is permitted for certain provisions. The Company is 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 revenues 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) modified retrospective with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application and providing certain additional disclosures. In August 2015, the FASB approved a one year deferral of the effective period of ASU 2014-09. The standard will be effective for the Company in the first quarter of its fiscal year 2019, but early adoption is permitted starting in the first quarter of fiscal year 2018. The FASB issued supplemental adoption guidance and clarification to ASU 2014-09 in 2016 and 2017. The Company intends to adopt the new standard in the first quarter of fiscal year 2019 using the modified retrospective method. Based upon the Company's preliminary assessment, certain portions of its product revenue will be accelerated to reflect consideration upon delivery and an element of installation will be deferred until performed. Revenue policies for indirect sales and service revenues are 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.
Accounting Standard Update Recently Adopted
Accounting Standard Updates	Accounting Standards Update Recently Adopted In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which provides amendments to current guidance to address the classification and presentation of changes in restricted cash in the statement of cash flows. The Company early adopted this ASU in its fiscal year 2017 third quarter and retrospectively applied the change to the statement of cash flows for the fiscal years ended June 30, 2016 and 2015. The Company disclosed its restricted cash on its consolidated balance sheets for the years presented. The adoption of this standard did not have a significant impact on the Company's consolidated financial statements and related disclosures.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Jun. 30, 2017
Summary of Significant Accounting Policies
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 share attributable to stockholders follows (in thousands): Years ended June 30, 2017 2016 2015 Numerator: Net loss used to compute basic and diluted loss per share $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Denominator: Weighted average shares used to compute basic and diluted loss per share ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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 June 30, 2017 2016 2015 Stock options RSUs, PSUs and MSUs 3.50% Convertible Notes 3.50% Series A Convertible Notes — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Jun. 30, 2017
Balance Sheet Components
Summary of cash and cash equivalents	The following is a summary of cash and cash equivalents (in thousands): June 30, June 30, Cash $ $ Money market funds Commercial paper — Municipal government securities — ​ ​ ​ ​ ​ ​ ​ ​ Total cash and cash equivalents $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of accounts receivable, net	Accounts receivable, net consisted of the following (in thousands): June 30, June 30, Accounts receivable $ $ Unbilled fees and services ​ ​ ​ ​ ​ ​ ​ ​ Less: Allowance for doubtful accounts ) ) ​ ​ ​ ​ ​ ​ ​ ​ Accounts receivable, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of financing receivables	A summary of the Company's financing receivables is presented as follows (in thousands): June 30, 2017 Lease Financed Total Gross $ $ $ Residual value — — — Unearned income ) — ) Allowance for credit loss ) — ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reported as: Current $ $ $ Non-current ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Lease Financed Total Gross $ $ $ Residual value — — — Unearned income ) — ) Allowance for credit loss — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reported as: Current $ $ $ Non-current ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total, net $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of future minimum lease payments receivable	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 June 30, 2017 are presented as follows (in thousands): Year Ending June 30, Amount 2018 $ 2019 2020 2021 2022 ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of inventories	Inventories consisted of the following (in thousands): June 30, June 30, Raw materials $ $ Work-in-process Finished goods ​ ​ ​ ​ ​ ​ ​ ​ Inventories $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of property and equipment, net	Property and equipment consisted of the following (in thousands): June 30, June 30, Furniture and fixtures $ $ Computer and office equipment Software Leasehold improvements Machinery and equipment Construction in progress ​ ​ ​ ​ ​ ​ ​ ​ Less: Accumulated depreciation ) ) ​ ​ ​ ​ ​ ​ ​ ​ Property and equipment, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of components of accumulated other comprehensive income (loss)	The following table summarizes the changes in accumulated other comprehensive income (loss) by component (in thousands): Foreign Unrealized Gains Change in Total Balance at June 30, 2015 $ $ ) $ ) $ ) Other comprehensive income (loss) before reclassifications ) ) ) Amounts reclassified from accumulated other comprehensive loss — ) — ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net current period other comprehensive income (loss) ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2016 ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2017 $ $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Foreign Exchange Instruments (T

Foreign Exchange Instruments (Tables)	12 Months Ended
	Jun. 30, 2017
Foreign Exchange Instruments
Schedule of effect of forward contracts not designated as hedging instruments and foreign currency transactions gains and losses	Years ended June 30, 2017 2016 2015 Foreign currency exchange gain (loss) on foreign contracts $ ) $ ) $ ) Foreign currency transactions gain (loss) )

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Jun. 30, 2017
Financial Instruments
Summary of amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category for cash, cash equivalents and short-term investments	The following tables summarize the amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category for cash, cash equivalents and short-term investments (in thousands): June 30, 2017 Estimated Fair Value Amortized Gross Gross Cash and Short-term Cash $ $ — $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Money market funds — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 2 U.S. government agency securities — ) — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ — $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Estimated Fair Value Amortized Gross Gross Cash and Short-term Cash $ $ — $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 Money market funds — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 2 Commercial paper — — U.S. government agency securities ) — U. S. treasury securities — — Municipal debt securities — — — Corporate debt securities — ) — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of contractual maturities of available-for-sale securities	Contractual maturities of available-for-sale securities at June 30, 2017 were as follows (in thousands): June 30, 2017 Amortized Estimated Due in 1 year or less $ $ Due in 1 - 2 years ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of available-for-sale debt securities that were in a continuous unrealized loss position	The following table summarizes our 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 Gross Estimated Gross Estimated Gross Estimated June 30, 2017 Debt Securities: U. S. government agency securities $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2016 Debt Securities: Corporate debt securities $ ) $ $ ) $ $ ) $ U. S. government agency securities — — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ) $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of carrying values and estimated fair values of long-term debt that are measured on a non-recurring basis	June 30, 2017 June 30, 2016 Carrying Value Fair Value Carrying Value Fair Value 3.75% Convertible Notes $ — $ — $ $ 3.50% Convertible Notes 3.50% Series A Convertible Notes Secured Loan — Revolver Credit Facility — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Goodwill and Purchased Intang30

Goodwill and Purchased Intangible Assets (Tables)	12 Months Ended
	Jun. 30, 2017
Goodwill and Purchased Intangible Assets
Schedule of goodwill and changes in the carrying amount of goodwill	As of June 30, 2017 2016 Balance at the beginning of the period $ $ Currency translation ) ) ​ ​ ​ ​ ​ ​ ​ ​ Balance at the end of the period $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of intangible assets associated with completed acquisitions and purchased patent license	The Company's intangible assets associated with completed acquisitions and purchased patent license are as follows (in thousands): As of June 30, 2017 As of June 30, 2016 Useful Gross Accumulated Net Gross Accumulated Net (in years) Developed technology 5 - 6 $ $ ) $ — $ $ ) $ Patent license ) — — — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total intangible assets $ $ ) $ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of estimated future amortization expense of purchased intangible assets	The estimated future amortization expense of purchased intangible assets as of June 30, 2017 is as follows (in thousands): Year Ending June 30, Amount 2018 $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Jun. 30, 2017
Commitments and Contingencies
Schedule of future minimum lease payments under non-cancelable operating lease agreements and long-term principal and interest on Convertible Notes	Future minimum lease payments under non-cancelable operating lease agreements and short-term principal and interest on the Existing 3.50% Convertible Notes and Revolving Credit Facility as of June 30, 2017 are as follows including the effects of the subsequent debt financing as reported in Note 18 (in thousands): Year Ending June 30, Operating Long-Term 2018 $ $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) These amounts represent principal and interest cash payments over the contractual life of the debt obligations, including anticipated interest payments that are not recorded on the Company's consolidated balance sheet. Any conversion, premium, redemption or purchase of Convertible Notes would impact cash payments noted in the preceding table.

Stock Incentive Plan and Empl32

Stock Incentive Plan and Employee Stock Purchase Plan (Tables)	12 Months Ended
	Jun. 30, 2017
Stock Incentive Plan and Employee Stock Purchase Plan
Summary of share-based compensation charges included in the Company's consolidated statements of operations and comprehensive loss	The following table summarizes the share-based compensation charges included in the Company's consolidated statements of operations and comprehensive loss (in thousands): Years ended June 30, 2017 2016 2015 Cost of revenue $ $ $ Research and development Selling and marketing General and administrative ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of assumptions used for determining fair value of stock options	The fair value of each option is estimated at the date of grant using the Black-Scholes option pricing formula with the following assumptions: Years Ended June 30, 2017 2016(1) 2015(1) Risk-free interest rate % — % — % Dividend yield — % — % — % Expected term — — Expected volatility % — % — % (1) The Company did not issue any stock options for the years ended June 30, 2016 and 2015.
Schedule of option activity under the Company's Incentive Plan	A summary of option activity under the Company's Incentive Plan during the fiscal years is presented below (in thousands except per share and term amounts): Options Weighted Weighted Aggregate Balance at June 30, 2014 $ $ Options granted — — Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2015 $ Options granted — — Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2016 $ Options granted Options exercised ) Options forfeited/expired ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested or Expected to vest at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Exercisable at June 30, 2017 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of information about outstanding and exercisable options	The following table summarizes information about outstanding and exercisable options at June 30, 2017 (in thousands, except years and exercise price): Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted Weighte Number Weighted $4.00 - 4.01 $ $ $4.23 - 4.94 $5.05 - 5.05 — — $5.38 - 5.68 $5.74 - 6.28 $6.32 - 6.63 $6.75 - 6.82 $6.96 - 6.96 $7.06 - 13.45 $15.22 - 15.22 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Outstanding $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of activity of RSUs, PSUs and MSUs	The following table summarizes the activity of RSUs, PSUs and MSUs (in thousands, except fair value per share): Unvested Resstricted Stock Restricted Performance Market Total Weighted Unvested at June 30, 2014 $ Granted Vested ) ) — ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2015 Granted — Vested ) ) ) ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2016 — Granted Vested ) — ) ) Cancelled/Forfeited ) — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unvested at June 30, 2017 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of weighted average assumptions used for determining fair value of ESPP shares	The Company estimates the fair value of ESPP shares at the date of grant using the Black-Scholes option pricing model. The weighted average assumptions were as follows: Years Ended June 30, 2017 2016 2015 Risk-free interest rate 0.49% - 0.70% 0.51% - 0.70% 0.07% - 0.26% Dividend yield —% —% —% Expected term 0.5 - 1.0 0.5 - 1.0 0.5 - 1.0 Expected volatility 24.6% - 42.0% 33.3% - 49.1% 27.1% - 41.3%

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Jun. 30, 2017
Income Taxes
Schedule of components of loss before provision for income taxes on the accompanying statements of operations and comprehensive loss	Loss before provision for income taxes on the accompanying statements of operations and comprehensive loss included the following components (in thousands): Years Ended June 30, 2017 2016 2015 Domestic $ ) $ ) $ ) Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total worldwide $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of provision for income taxes	The provision for income taxes consisted of the following (in thousands): Years Ended June 30, 2017 2016 2015 Current: Federal $ — $ — $ — State Foreign ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total current $ $ $ Deferred: Federal — — — State — — — Foreign ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total deferred ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total provision for income taxes $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of reconciliation of income taxes at the statutory federal income tax rate to the provision for income taxes included in the accompanying consolidated statements of operations and comprehensive loss	Income tax payable was $1.2 million, $2.3 million and $0.4 million at June 30, 2017, 2016 and 2015, respectively. A reconciliation of income taxes at the statutory federal income tax rate to the provision for income taxes included in the accompanying consolidated statements of operations and comprehensive loss is as follows (in thousands): Years Ended June 30, 2017 2016 2015 U.S. federal taxes (benefit): At federal statutory rate $ ) $ ) $ ) State tax, net of federal benefit Share-based compensation expense Debt extinguishment — — Other non-deductible permanent items Change in valuation allowance Credits ) ) ) Other — Foreign taxes ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of significant components of net deferred tax assets	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company's net deferred tax assets were as follows (in thousands): June 30, 2017 2016 Deferred tax assets: Federal and state net operating losses $ $ Accrued expenses and reserves Deferred revenue Credits Share-based compensation expense Capitalized research and development Unicap Fixed assets/intangibles ) Other ​ ​ ​ ​ ​ ​ ​ ​ Total deferred tax assets Deferred tax liabilities: Debt discount ) ) Section 481 adjustment ) ) ​ ​ ​ ​ ​ ​ ​ ​ Total deferred tax liabilities ) ) Valuation allowance ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of aggregate changes in the balance of gross unrecognized tax benefits	The aggregate changes in the balance of gross unrecognized tax benefits were as follows (in thousands): Years Ended June 30, 2017 2016 2015 Balance at beginning of year $ $ $ Tax positions related to current year: Additions Tax positions related to prior years: Additions Reductions ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at end of year $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Expense, Net (Tables)

Other Expense, Net (Tables)	12 Months Ended
	Jun. 30, 2017
Other Expense, Net
Schedule of other income (expense), net	Other expense, net consisted of the following (in thousands): Years Ended June 30, 2017 2016 2015 Interest expense on debt $ ) $ ) $ ) Foreign currency transaction loss ) ) ) Other (expense) income(1) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other expense, net $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Other (expense) income consists of interest income, investment gains and losses, other miscellaneous income and expenses related to extinguishment of debt.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Jun. 30, 2017
Debt
Schedule of carrying values of all Convertible Notes	The following table presents the carrying values of all Convertible Notes and notes issued pursuant to the Revolving Credit Facility (collectively, "Notes") as of June 30, 2017 (in thousands): Revolving 3.50% 3.50% Total Carrying amount of equity conversion component $ — $ — $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Principal amount of the Notes $ $ $ $ Unamortized debt costs — ) — ) Unamortized debt discount — — ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net carrying amount $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of interest expense on all Convertible Notes	A summary of interest expense on the Notes is as follows (in thousands): Year ended June 30, 2017(1) 2016 2015 Interest expense related to contractual interest coupon $ $ $ Interest expense related to amortization of debt discount Interest expense related to amortization of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Debt issuance costs were higher in fiscal year 2017 due to the repayment of the Secured Loan and the write-off of the related debt issuance costs.

Defined Benefit Pension Oblig36

Defined Benefit Pension Obligation (Tables)	12 Months Ended
	Jun. 30, 2017
Defined Benefit Pension Obligation
Schedule of funded status	The following table presents the funded status of the defined benefit pension plan (in thousands): June 30, 2017 2016 Change in benefit obligation: Benefit obligation—beginning of fiscal year $ $ Service cost Interest cost Plan participants' contributions Plan amendment — ) Actuarial (gain) loss ) Foreign currency changes ) Benefit and expense payments ) ) ​ ​ ​ ​ ​ ​ ​ ​ Benefit obligation—end of fiscal year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Change in plan assets: Plan assets—beginning of fiscal year $ $ Employer contributions Actual return on plan assets Plan participants' contributions Foreign currency changes ) Benefit and expense payments ) ) ​ ​ ​ ​ ​ ​ ​ ​ Plan assets—end of fiscal year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Funded status $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amounts recognized within the consolidated balance sheets: Assets $ — $ — Long-term other liabilities ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net amount recognized $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of amounts recognized in accumulated other comprehensive loss (before tax)	The following table presents the amounts recognized in accumulated other comprehensive loss (before tax) for the defined benefit pension plan (in thousands): June 30, 2017 2016 Net loss $ ) $ ) Prior service cost (credit) ) ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive loss $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of projected benefit obligations, accumulated benefit obligation and fair value of plan assets where accumulated benefit obligation exceeded fair value of plan assets	The following table presents the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for this defined benefit pension plan where accumulated benefit obligation exceeded the fair value of plan assets (in thousands): June 30, 2017 2016 Projected benefit obligation $ $ Accumulated benefit obligation $ $ Fair value of plan assets $ $
Components of net periodic benefit cost and other amounts recognized in other comprehensive loss	The following table shows the components of the Company's net periodic benefit costs and the other amounts recognized in other comprehensive loss, before tax, related to the Company's defined benefit pension plan (in thousands): Year ended June 30, 2017 2016 2015 Net Periodic Benefit Costs: Service cost $ $ $ Interest cost Expected returns on assets ) ) ) Amortization of prior service cost (credit) ) — — Amortization of net loss ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net periodic benefit costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other Amounts Recognized in Other Comprehensive Loss: Net (gain) loss arising during the year ) Prior service cost (credit) ) — Amortization of net (gain) loss ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total recognized in other comprehensive loss ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total recognized in net periodic benefit costs and other comprehensive loss $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of amounts in accumulated other comprehensive loss that are expected to be recognized	The amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2018 related to the Company's defined benefit pension plan are as follows (in thousands): 2018 Net loss $ Prior service cost (credit) ) ​ ​ ​ ​ ​ Accumulated other comprehensive loss $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of assumptions used to determine net periodic benefit cost and benefit obligation	Fiscal Years 2017 2016 2015 Net Periodic Benefit Costs: Discount rate % % % Rate of compensation increase % % % Expected long-term return on assets % % % June 30, 2017 2016 Benefit Obligation: Discount rate % % Rate of compensation increase % %
Schedule of estimated future benefit payments	Estimated future benefit payments to the defined benefit pension plan at June 30, 2017 were as follows (in thousands): Year Ending June 30, Future 2018 $ 2019 2020 2021 2022 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Segment Disclosure (Tables)

Segment Disclosure (Tables)	12 Months Ended
	Jun. 30, 2017
Segment Disclosure
Summary of revenue by geographic region	Revenues attributed to a country or region is based on the shipping addresses of the Company's customers. The following summarizes revenue by geographic region (in thousands): Years ended June 30, 2017 2016 2015 Americas $ $ $ Europe, Middle East, India and Africa Asia Pacific Japan ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of geographic areas in which the Company has long lived tangible assets	Information regarding geographic areas in which the Company has long-lived tangible assets is as follows (in thousands): June 30, June 30, Americas $ $ Europe, Middle East, India and Africa Asia Pacific (excluding Japan and India) Japan ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Quarterly Financial Data (una38

Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Jun. 30, 2017
Quarterly Financial Data (unaudited)
Schedule of selected quarterly financial data (unaudited)	The following table provides the selected quarterly financial data for fiscal 2017 and 2016 (in thousands, except net income (loss) per share amounts: Quarters ended September 30, December 31, March 31, June 30, Net revenue $ $ $ $ Gross profit $ $ $ $ Net loss $ ) $ ) $ ) $ ) Net loss per share—basic and diluted $ ) $ ) $ ) $ ) Shares used in basic and diluted per share calculation Quarters ended September 30, December 31, March 31, June 30, Net revenue $ $ $ $ Gross profit $ $ $ $ Net income (loss) $ ) $ ) $ $ ) Net income (loss) per share—basic $ ) $ ) $ $ ) Net income (loss) per share—diluted $ ) $ ) $ $ ) Shares used in basic per share calculation Shares used in diluted per share calculation

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Concentration Risk (Details)	12 Months Ended
	Jun. 30, 2017customeritem	Jun. 30, 2016customer	Jun. 30, 2015customer
Cash, cash equivalent and investments | Investment concentration risk
Concentration of Credit and Other Risks
Number of obligors or makers | item	1
Cash, cash equivalent and investments | Investment concentration risk | Maximum
Concentration of Credit and Other Risks
Percentage of concentration risk	5.00%
Total net revenue | Customer concentration risk
Concentration of Credit and Other Risks
Number of significant customers	0	1	0
Total net revenue | Customer concentration risk | Minimum
Concentration of Credit and Other Risks
Percentage of concentration risk	10.00%	10.00%	10.00%
Total accounts receivable | Credit concentration risk
Concentration of Credit and Other Risks
Number of significant customers	2	1
Percentage of concentration risk	30.00%	18.00%

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Deferred Revenue (Details)	12 Months Ended
	Jun. 30, 2017
Deferred Revenue and Deferred Cost of Revenue
Maximum expected period to classify deferred revenue as current liabilities and deferred costs of revenue as current assets	1 year

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Jun. 30, 2017
Machinery and equipment
Property and Equipment
Period over which property and equipment are depreciated	5 years
Furniture and fixtures
Property and Equipment
Period over which property and equipment are depreciated	4 years
Computer and office equipment
Property and Equipment
Period over which property and equipment are depreciated	3 years
Computer Software
Property and Equipment
Period over which property and equipment are depreciated	3 years

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Software Capitalization Costs, Goodwill and Purchased Intangible Assets and Advertising Expenses (Details)	12 Months Ended
	Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)
Software Capitalization Costs
Capitalized development of software costs	$ 0
Goodwill and Purchased Intangible Assets
Number of operating segments | segment	1
Number of reporting units | segment	1
Impairment of goodwill	$ 0	$ 0	$ 0
Advertising Expenses
Advertising expenses	$ 400,000	$ 300,000	$ 500,000
Minimum
Goodwill and Purchased Intangible Assets
Estimated useful lives of purchased intangible assets	1 year
Maximum
Goodwill and Purchased Intangible Assets
Estimated useful lives of purchased intangible assets	7 years

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Share-Based Compensation, Net Loss Per Common Share and Income Taxes (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Apr. 17, 2014	Feb. 28, 2013	Aug. 01, 2011
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)					16,068	16,222	18,294
Numerator:
Net loss used to compute basic and diluted loss per share					$ (29,579)	$ (25,504)	$ (40,209)
Denominator:
Weighted average shares used to compute basic and diluted loss per share	83,179	82,913	82,328	81,576	82,495	80,509	78,277
Income Taxes
Reduction in uncertain tax position due to lapse of various statutes of limitation					$ 100
Subsequent period within which no material changes in unrecognized tax benefits are expected					12 months
3.75% Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.75%				3.75%	3.75%				3.75%
Conversion shares outstanding principal amount excluded in the potentially diluted shares					3,900
3.50% Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.50%				3.50%	3.50%		3.50%	3.50%
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)					8,378	8,378	8,378
3.50% Series A Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.50%				3.50%	3.50%		3.50%
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)							2,896
Conversion shares outstanding principal amount excluded in the potentially diluted shares					13,200
Stock options
Anti-dilutive securities excluded from computation of earnings per share
Expiration period					10 years
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)					2,463	2,377	2,537
RSUs, PSUs and MSUs
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)					5,227	5,467	4,483

Balance Sheet Components - Summ

Balance Sheet Components - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash and Cash Equivalents
Cash	$ 70,515	$ 95,906
Money market funds	1,569	13,362
Commercial paper		8,938
Municipal government securities		1,565
Cash and cash equivalents	72,084	119,771
Accounts receivable, net
Accounts receivable	70,394	54,974
Unbilled fees and services	2,815	2,662
Accounts and other receivable, gross	73,209	57,636
Less: Allowance for doubtful accounts	(420)	(826)
Accounts receivable, net	72,789	56,810
Allowance for doubtful accounts, payments and credits	100	200
Allowance for doubtful accounts, additions	200	300
Allowance for doubtful accounts, write-offs	500	10
Financing receivables
Sales-type leases	2,800	3,500
Accounts receivable with contractual maturities of more than one year	4,600	4,100
Gross	10,298	10,838
Unearned income	(433)	(623)
Allowance for credit loss	(39)
Total, net	9,826	10,215
Current	2,397	2,618
Non-current	7,429	7,597
Capital leases future minimum payments receivable
2,018	930
2,019	930
2,020	930
2,021	930
2,022	310
Total	4,030
Inventories
Raw materials	38,803	49,618
Work-in-process	15,471	20,175
Finished goods	50,780	46,194
Inventories	105,054	115,987
Inventories reclassified between raw materials and finished goods as of June 30, 2016 to conform current year's presentation	900
Property and equipment, net
Property and equipment, gross	103,062	100,331
Less: Accumulated depreciation	(80,000)	(72,453)
Property and equipment, net	23,062	27,878
Depreciation expense	10,300	10,300	$ 11,600
Lease Receivables
Financing receivables
Gross	4,030	4,998
Unearned income	(433)	(623)
Allowance for credit loss	(39)
Total, net	3,558	4,375
Current	720	840
Non-current	2,838	3,535
Financed Service Contracts and Other
Financing receivables
Gross	6,268	5,840
Total, net	6,268	5,840
Current	1,677	1,778
Non-current	4,591	4,062
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	4,364	4,527
Computer and office equipment
Property and equipment, net
Property and equipment, gross	11,802	11,485
Computer Software
Property and equipment, net
Property and equipment, gross	11,457	11,104
Leasehold improvements
Property and equipment, net
Property and equipment, gross	23,164	21,632
Machinery and equipment
Property and equipment, net
Property and equipment, gross	48,742	47,171
Construction in progress
Property and equipment, net
Property and equipment, gross	$ 3,533	$ 4,412

Balance Sheet Components - Accu

Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income.
Balance	$ 59,660
Balance	46,533	$ 59,660
Foreign Currency Items
Accumulated Other Comprehensive Income.
Balance	1,121	1,168
Other comprehensive income (loss) before reclassifications	33	(47)
Net current period other comprehensive income (loss)		(47)
Balance	1,154	1,121
Unrealized Gains and (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income.
Balance	(15)	(77)
Other comprehensive income (loss) before reclassifications	(74)	63
Amounts reclassified from accumulated other comprehensive loss		(1)
Net current period other comprehensive income (loss)		62
Balance	(89)	(15)
Change in Defined Pension Benefit Obligation
Accumulated Other Comprehensive Income.
Balance	(2,066)	(1,517)
Other comprehensive income (loss) before reclassifications	949	(549)
Net current period other comprehensive income (loss)		(549)
Balance	(1,117)	(2,066)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income.
Balance	(960)	(426)
Other comprehensive income (loss) before reclassifications	908	(533)
Amounts reclassified from accumulated other comprehensive loss		(1)
Net current period other comprehensive income (loss)		(534)
Balance	$ (52)	$ (960)

Foreign Exchange Instruments (D

Foreign Exchange Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Foreign currency forward contracts	$ 0	$ 0
Other expense, net
Foreign currency transactions gain (loss)	55	2,141	$ (1,196)
Other expense, net | Foreign contracts
Foreign currency transactions gain (loss)	$ (1,322)	$ (4,155)	$ (1,355)
Maximum
Length of forward contracts	3 months

Financial Instruments - Investm

Financial Instruments - Investment (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)position	Jun. 30, 2016USD ($)position
Cash, cash equivalents and short-term investments
Amortized Cost	$ 96,082	$ 167,025
Gross Unrealized Gains		8
Gross Unrealized Losses	(89)	(23)
Cash and Cash Equivalents	72,084	119,771
Short-term Investments	23,909	47,239
Other-than-temporary impairments	0	0
Amortized Cost
Due in 1 year or less	12,000
Due in 1-2 years	11,998
Total Amortized Cost	23,998
Estimated Fair Value
Due in 1 year or less	11,970
Due in 1-2 years	11,939
Available-for-sale Securities	23,909
Gross Unrealized Losses
Less Than 12 Months	(31)	(3)
12 Months or Greater	(58)	(20)
Total	(89)	(23)
Estimated Fair Value
Less Than 12 Months	11,970	6,325
12 Months or Greater	11,939	23,148
Total	$ 23,909	$ 29,473
Number of positions held in an unrealized loss position | position	8	11
U.S. government agency securities
Gross Unrealized Losses
Less Than 12 Months	$ (31)
12 Months or Greater	(58)	$ (17)
Total	(89)	(17)
Estimated Fair Value
Less Than 12 Months	11,970
12 Months or Greater	11,939	19,988
Total	23,909	19,988
Corporate debt securities
Gross Unrealized Losses
Less Than 12 Months		(3)
12 Months or Greater		(3)
Total		(6)
Estimated Fair Value
Less Than 12 Months		6,325
12 Months or Greater		3,160
Total		9,485
Cash.
Cash, cash equivalents and short-term investments
Amortized Cost	70,515	95,906
Cash and Cash Equivalents	70,515	95,906
Level 1
Cash, cash equivalents and short-term investments
Amortized Cost		13,362
Cash and Cash Equivalents		13,362
Level 1 | Money market funds
Cash, cash equivalents and short-term investments
Amortized Cost	1,569	13,362
Cash and Cash Equivalents	1,569	13,362
Level 2
Cash, cash equivalents and short-term investments
Amortized Cost		57,757
Gross Unrealized Gains		8
Gross Unrealized Losses		(23)
Cash and Cash Equivalents		10,503
Short-term Investments		47,239
Level 2 | Commercial paper
Cash, cash equivalents and short-term investments
Amortized Cost		14,704
Cash and Cash Equivalents		8,938
Short-term Investments		5,766
Level 2 | U.S. government agency securities
Cash, cash equivalents and short-term investments
Amortized Cost	23,998	28,000
Gross Unrealized Gains		7
Gross Unrealized Losses	(89)	(17)
Short-term Investments	$ 23,909	27,990
Level 2 | U.S. Treasury securities
Cash, cash equivalents and short-term investments
Amortized Cost		3,997
Gross Unrealized Gains		1
Short-term Investments		3,998
Level 2 | Municipal debt securities
Cash, cash equivalents and short-term investments
Amortized Cost		1,565
Cash and Cash Equivalents		1,565
Level 2 | Corporate debt securities
Cash, cash equivalents and short-term investments
Amortized Cost		9,491
Gross Unrealized Losses		(6)
Short-term Investments		$ 9,485

Financial Instruments - Convert

Financial Instruments - Convertible Notes (Details) - USD ($) $ in Thousands	Aug. 07, 2017	Jun. 30, 2017	Jun. 30, 2016	Apr. 17, 2014	Feb. 28, 2013	Aug. 01, 2011
Carrying Value
Fair value measurement
Long term debt		$ 164,571	$ 210,412
Fair Value
Fair value measurement
Long term debt		$ 174,676	$ 233,194
3.75% Convertible Notes
Fair value measurement
Interest rate (as a percent)		3.75%	3.75%			3.75%
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%
Existing 3.50% Convertible Notes
Fair value measurement
Interest rate (as a percent)	3.50%	3.50%
Non-recurring basis | Level 2 | 3.75% Convertible Notes | Carrying Value
Fair value measurement
Long term debt			$ 36,400
Non-recurring basis | Level 2 | 3.75% Convertible Notes | Fair Value
Fair value measurement
Long term debt			36,487
Non-recurring basis | Level 2 | 3.50% Convertible Notes | Carrying Value
Fair value measurement
Long term debt		$ 44,099	43,195
Non-recurring basis | Level 2 | 3.50% Convertible Notes | Fair Value
Fair value measurement
Long term debt		48,146	51,450
Non-recurring basis | Level 2 | 3.50% Series A Convertible Notes | Carrying Value
Fair value measurement
Long term debt		68,924	66,613
Non-recurring basis | Level 2 | 3.50% Series A Convertible Notes | Fair Value
Fair value measurement
Long term debt		$ 74,982	81,053
Non-recurring basis | Level 2 | Secured Loan | Carrying Value
Fair value measurement
Long term debt			64,204
Non-recurring basis | Level 2 | Secured Loan | Fair Value
Fair value measurement
Long term debt			$ 64,204
Non-recurring basis | Level 2 | Existing 3.50% Convertible Notes
Fair value measurement
Interest rate (as a percent)		3.50%
MidCap Revolving Credit Facility | Non-recurring basis | Level 2 | Carrying Value
Fair value measurement
Long term debt		$ 51,548
MidCap Revolving Credit Facility | Non-recurring basis | Level 2 | Fair Value
Fair value measurement
Long term debt		$ 51,548

Goodwill and Purchased Intang49

Goodwill and Purchased Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 57,848	$ 58,054
Currency translation	(36)	(206)
Balance at the end of the period	57,812	57,848	$ 58,054
Impairment of goodwill	0	0	0
Gross Carrying Amount	47,700	46,743
Accumulated Amortization	(46,736)	(39,132)
Net Amount	964	7,611
Amortization expense	7,700	8,000	$ 7,900
Estimated future amortization expense of purchased intangible assets
2,018	143
2,019	143
2,020	143
2,021	143
2,022	143
There after	249
Net Amount	$ 964	7,611
Minimum
Changes in the carrying amount of goodwill
Useful Lives	1 year
Maximum
Changes in the carrying amount of goodwill
Useful Lives	7 years
Developed technology
Changes in the carrying amount of goodwill
Gross Carrying Amount	$ 46,700	46,743
Accumulated Amortization	$ (46,700)	(39,132)
Net Amount		7,611
Estimated future amortization expense of purchased intangible assets
Net Amount		$ 7,611
Developed technology | Minimum
Changes in the carrying amount of goodwill
Useful Lives	5 years	5 years
Developed technology | Maximum
Changes in the carrying amount of goodwill
Useful Lives	6 years	6 years
Patent license
Changes in the carrying amount of goodwill
Useful Lives	7 years	7 years
Gross Carrying Amount	$ 1,000
Accumulated Amortization	(36)
Net Amount	964
Estimated future amortization expense of purchased intangible assets
Net Amount	$ 964

Commitments and Contingencies -

Commitments and Contingencies - Operating Leases, Long-Term Debt and Royalty Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Aug. 07, 2017
Operating Lease Agreements and Long-term Debt
Rent expense	$ 8,600	$ 8,300	$ 8,000
Future minimum lease payments under non-cancelable operating lease agreements
2,018		9,290
2,019		7,569
2,020		6,844
2,021		6,062
2,022		6,093
Thereafter		12,642
Total		48,500
Long-term principal and interest on Convertible Notes
2,018		47,597
2,019		6,827
2,020		6,828
2,021		6,828
2,022		58,827
Thereafter		85,266
Total		212,173
License agreement | WARF (Wisconsin Alumni Research Foundation)
License and Royalty Agreements
Royalty costs	500	600	$ 600
Royalty amount accrued	200	$ 200
License agreement | WARF (Wisconsin Alumni Research Foundation) | Minimum
License and Royalty Agreements
Annual commitment amount	$ 300
Existing 3.50% Convertible Notes
Operating Lease Agreements and Long-term Debt
Interest rate (as a percent)	3.50%			3.50%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - shares shares in Millions	Jun. 30, 2017	Jun. 30, 2016	Apr. 17, 2014	Feb. 28, 2013	Aug. 01, 2011
Stockholders' equity
Number of shares of common stock reserved for issuance under stock incentive plans and employee stock purchase plan	7.7
3.75% Convertible Notes
Stockholders' equity
Interest rate (as a percent)	3.75%	3.75%			3.75%
3.50% Convertible Notes
Stockholders' equity
Authorized common stock reserved for future issuance (in shares)	13.2
Interest rate (as a percent)	3.50%	3.50%	3.50%	3.50%

Stock Incentive Plan and Empl52

Stock Incentive Plan and Employee Stock Purchase Plan - Outstanding Stock Incentive Plans (Details)	12 Months Ended
	Jun. 30, 2017item
Stock Incentive Plan
Number of stock incentive plans	3
2007 Amended and Restated Plan | Stock options
Stock Incentive Plan
Contractual term	10 years
Percentage of the award vesting at first anniversary	25.00%
Vesting period for first 25% vesting rights	1 year
Remainder vesting period	36 months
2007 Amended and Restated Plan | Stock options | Minimum
Stock Incentive Plan
Exercise price of stock options as a percentage of fair market value on the grant date	100.00%
2007 Amended and Restated Plan | Restricted Stock Units
Stock Incentive Plan
Percentage of the award vesting at first anniversary	50.00%
Percentage of the award vesting at second anniversary	50.00%
2007 Amended and Restated Plan | Time-based RSUs
Stock Incentive Plan
Annual vesting percentage	25.00%

Stock Incentive Plan and Empl53

Stock Incentive Plan and Employee Stock Purchase Plan - Share-Based Compensation Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based compensation charges
Share-based compensation expense	$ 13,629	$ 12,638	$ 13,930
Cost of revenue
Share-based compensation charges
Share-based compensation expense	1,991	1,677	1,874
Research and development
Share-based compensation charges
Share-based compensation expense	2,490	2,564	2,971
Selling and marketing
Share-based compensation charges
Share-based compensation expense	2,827	2,633	2,945
General and administrative
Share-based compensation charges
Share-based compensation expense	$ 6,321	$ 5,764	$ 6,140

Stock Incentive Plan and Empl54

Stock Incentive Plan and Employee Stock Purchase Plan - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Additional disclosures
Fair value of common stock (in dollars per share)	$ 4.75
Share-based compensation expense	$ 13,629	$ 12,638	$ 13,930
Stock options
Weighted average assumptions used for determining fair value of options
Risk-free interest rate (as a percent)	1.76%
Expected term (in years)	5 years 1 month 13 days	0 years	0 years
Expected volatility (as a percent)	46.40%
Options Outstanding
Balance at the beginning of the year (in shares)	2,377	2,537	3,209
Options granted (in shares)	760
Options exercised (in shares)	(113)	(59)	(529)
Options forfeited/expired (in shares)	(561)	(101)	(143)
Balance at the end of the year (in shares)	2,463	2,377	2,537	3,209
Vested or Expected to vest at the end of the year (in shares)	2,463
Exercisable at the end of the year (in shares)	1,703
Weighted Average Exercise Price
Balance at the beginning of the year (in dollars per share)	$ 8	$ 7.91	$ 7.44
Options granted (in dollars per share)	5.05
Options exercised (in dollars per share)	5.18	4.89	4.84
Options forfeited/expired (in dollars per share)	13.38	7.53	8.72
Balance at the end of the year (in dollars per share)	6.05	$ 8	$ 7.91	$ 7.44
Vested or Expected to vest at the end of the year (in dollars per share)	6.05
Exercisable at the end of the year (in dollars per share)	$ 6.49
Weighted Average Remaining Contractual Life (In Years)
Balance	5 years 5 months 1 day	3 years 11 months 19 days	5 years 1 month 6 days	5 years 4 months 17 days
Vested or Expected to vest at the end of the year	5 years 5 months 1 day
Exercisable at the end of the year	3 years 7 months 21 days
Aggregate Intrinsic Value (in thousands)
Balance at the beginning of the year	$ 452	$ 1,862	$ 8,251
Balance at the end of the year	191	452	1,862	$ 8,251
Vested or Expected to vest at the end of the year	191
Exercisable at the end of the year	191
Additional disclosures
Total intrinsic value of options exercised	100	100	1,400
Share-based compensation expense	500	800	1,100
Realized excess tax benefits related to stock options exercises	0	$ 0	$ 0
Unrecognized compensation cost related to unvested stock options, net of estimated forfeitures	$ 1,400
Weighted average period for recognition of compensation costs	3 years 5 months 1 day

Stock Incentive Plan and Empl55

Stock Incentive Plan and Employee Stock Purchase Plan - Outstanding and Exercisable Options (Details) - Stock options shares in Thousands	12 Months Ended
	Jun. 30, 2017$ / sharesshares
Options Outstanding
Number Outstanding | shares	2,463
Weighted-Average Remaining Contractual Life (Years)	5 years 5 months 1 day
Weighted-Average Exercise Price (in dollars per share)	$ 6.05
Options Exercisable
Number Outstanding | shares	1,703
Weighted-Average Exercise Price (in dollars per share)	$ 6.49
$4.00 - 4.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	4
Exercise price, high end of range (in dollars per share)	$ 4.01
Options Outstanding
Number Outstanding | shares	248
Weighted-Average Remaining Contractual Life (Years)	4 years 4 months 6 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.01
Options Exercisable
Number Outstanding | shares	248
Weighted-Average Exercise Price (in dollars per share)	$ 4.01
$4.23 - 4.94
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	4.23
Exercise price, high end of range (in dollars per share)	$ 4.94
Options Outstanding
Number Outstanding | shares	61
Weighted-Average Remaining Contractual Life (Years)	1 year 9 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.66
Options Exercisable
Number Outstanding | shares	61
Weighted-Average Exercise Price (in dollars per share)	$ 4.66
$5.05 - 5.05
Options Outstanding
Number Outstanding | shares	760
Weighted-Average Remaining Contractual Life (Years)	9 years 5 months 1 day
Weighted-Average Exercise Price (in dollars per share)	$ 5.05
$5.38 - 5.68
Options Outstanding
Number Outstanding | shares	266
Weighted-Average Remaining Contractual Life (Years)	2 years 6 months 15 days
Weighted-Average Exercise Price (in dollars per share)	$ 5.65
Options Exercisable
Number Outstanding | shares	266
Weighted-Average Exercise Price (in dollars per share)	$ 5.65
$5.74 - 6.28
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	5.74
Exercise price, high end of range (in dollars per share)	$ 6.28
Options Outstanding
Number Outstanding | shares	394
Weighted-Average Remaining Contractual Life (Years)	4 years 5 months 12 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.16
Options Exercisable
Number Outstanding | shares	394
Weighted-Average Exercise Price (in dollars per share)	$ 6.16
$6.32 - 6.63
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	6.32
Exercise price, high end of range (in dollars per share)	$ 6.63
Options Outstanding
Number Outstanding | shares	247
Weighted-Average Remaining Contractual Life (Years)	2 years 11 months 19 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.50
Options Exercisable
Number Outstanding | shares	247
Weighted-Average Exercise Price (in dollars per share)	$ 6.50
$6.75 - 6.82
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	6.75
Exercise price, high end of range (in dollars per share)	$ 6.82
Options Outstanding
Number Outstanding | shares	14
Weighted-Average Remaining Contractual Life (Years)	4 years 2 months 19 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.77
Options Exercisable
Number Outstanding | shares	14
Weighted-Average Exercise Price (in dollars per share)	$ 6.77
$6.96 - 6.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	6.96
Exercise price, high end of range (in dollars per share)	$ 6.96
Options Outstanding
Number Outstanding | shares	276
Weighted-Average Remaining Contractual Life (Years)	5 years 3 months
Weighted-Average Exercise Price (in dollars per share)	$ 6.96
Options Exercisable
Number Outstanding | shares	276
Weighted-Average Exercise Price (in dollars per share)	$ 6.96
$7.06 - 13.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low end of range (in dollars per share)	7.06
Exercise price, high end of range (in dollars per share)	$ 13.45
Options Outstanding
Number Outstanding | shares	143
Weighted-Average Remaining Contractual Life (Years)	2 years 2 months 12 days
Weighted-Average Exercise Price (in dollars per share)	$ 9.74
Options Exercisable
Number Outstanding | shares	143
Weighted-Average Exercise Price (in dollars per share)	$ 9.74
$15.22 - 15.22
Options Outstanding
Number Outstanding | shares	54
Weighted-Average Remaining Contractual Life (Years)	6 months
Weighted-Average Exercise Price (in dollars per share)	$ 15.22
Options Exercisable
Number Outstanding | shares	54
Weighted-Average Exercise Price (in dollars per share)	$ 15.22

Stock Incentive Plan and Empl56

Stock Incentive Plan and Employee Stock Purchase Plan - Restricted Stock (Details)	1 Months Ended	12 Months Ended
	Oct. 31, 2012item	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares	Jun. 30, 2015USD ($)$ / sharesshares
Additional disclosures
Share-based compensation expense | $		$ 13,629,000	$ 12,638,000	$ 13,930,000
Restricted Stock Units, Performance Stock Units and Market Stock Units
Total Number of Shares Underlying
Unvested at the beginning of the year (in shares)		5,366,000	4,483,000	3,947,000
Granted (in shares)		2,340,000	3,148,000	2,212,000
Vested (in shares)		(1,710,000)	(1,571,000)	(1,175,000)
Cancelled/Forfeited (in shares)		(769,000)	(694,000)	(501,000)
Unvested at the end of the year (in shares)		5,227,000	5,366,000	4,483,000
Weighted Average Grant Date Fair Value Per Share
Unvested at the beginning of the year (in dollars per share) | $ / shares		$ 6.48	$ 6.86	$ 6.24
Granted (in dollars per share) | $ / shares		5.03	6.12	6.77
Vested (in dollars per share) | $ / shares		4.99	6.81	6.73
Cancelled/Forfeited (in dollars per share) | $ / shares		5.86	6.59	6.20
Unvested at the end of the year (in dollars per share) | $ / shares		$ 5.75	6.48	6.86
Additional disclosures
Unrecognized compensation cost | $		$ 26,300,000
Weighted average period for recognition of compensation costs		2 years 1 month 17 days
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 5.03	$ 6.12	$ 6.77
Vested (in shares)		1,710,000	1,571,000	1,175,000
Restricted Stock Units
Total Number of Shares Underlying
Unvested at the beginning of the year (in shares)		4,204,000	3,325,000	3,116,000
Granted (in shares)		1,622,000	2,563,000	1,679,000
Vested (in shares)		(1,534,000)	(1,138,000)	(1,150,000)
Cancelled/Forfeited (in shares)		(408,000)	(546,000)	(320,000)
Unvested at the end of the year (in shares)		3,884,000	4,204,000	3,325,000
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) | $ / shares		$ 5.03	$ 6.01	$ 6.79
Additional disclosures
Share-based compensation expense | $		$ 9,500,000	$ 7,600,000	$ 7,900,000
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 5.03	$ 6.01	$ 6.79
Aggregate fair market value of units vested | $		$ 7,600,000
Vested (in shares)		1,534,000	1,138,000	1,150,000
Performance Stock Units
Total Number of Shares Underlying
Unvested at the beginning of the year (in shares)			20,000	25,000
Granted (in shares)		10,000		20,000
Vested (in shares)			(20,000)	(25,000)
Unvested at the end of the year (in shares)		10,000		20,000
Additional disclosures
Share-based compensation expense | $		$ 0	$ 40,000	$ 200,000
Vested (in shares)			20,000	25,000
Cancelled (in shares)		0	0	0
Market Stock Units
Total Number of Shares Underlying
Unvested at the beginning of the year (in shares)		1,162,000	1,138,000	806,000
Granted (in shares)		708,000	585,000	513,000
Vested (in shares)		(176,000)	(413,000)
Cancelled/Forfeited (in shares)		(361,000)	(148,000)	(181,000)
Unvested at the end of the year (in shares)		1,333,000	1,162,000	1,138,000
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) | $ / shares		$ 5.20	$ 6.61	$ 6.64
Additional disclosures
Unrecognized compensation cost | $		$ 2,600,000
Share-based compensation expense | $		$ 2,500,000	$ 3,000,000	$ 3,400,000
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 5.20	$ 6.61	$ 6.64
Vested (in shares)		176,000	413,000
Stock options
Additional disclosures
Weighted average period for recognition of compensation costs		3 years 5 months 1 day
Share-based compensation expense | $		$ 500,000	$ 800,000	$ 1,100,000
MSU Program | Market Stock Units
Total Number of Shares Underlying
Vested (in shares)			(0.40)	(0.50)
Additional disclosures
Share-based compensation expense | $		$ 700,000	$ 600,000	$ 500,000
Vested (in shares)			0.40	0.50
Number of measurement periods | item	2
MSU Program | Market Stock Units | Maximum
Additional disclosures
Target number of shares that participating executives may earn (as a percent)	150.00%

Stock Incentive Plan and Empl57

Stock Incentive Plan and Employee Stock Purchase Plan - ESPP (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Other disclosures
Share-based compensation expense	$ 13,629,000	$ 12,638,000	$ 13,930,000
ESPP
Stock Incentive Plan
Purchase price expressed as percentage of fair market value of common stock	85.00%
Other disclosures
Share-based compensation expense		$ 1,200,000	$ 1,300,000	$ 1,300,000
Shares issued under the ESPP		700,000	700,000
Weighted average fair value (in dollars per share)		$ 3.84	$ 4.92
Unrecognized compensation cost		$ 600,000
Weighted average period for recognition of compensation costs		7 months 6 days
ESPP | Maximum
Stock Incentive Plan
Payroll deductions as percentage of salaries	10.00%
Number of shares per period up to which employees may purchase	2,500
Value of shares up to which employees may purchase in any calendar year	$ 25,000
Weighted average assumptions used for determining fair value of options
Risk-free interest rate (as a percent)	0.70%	0.70%	0.26%
Expected term (in years)	1 year	1 year	1 year
Expected volatility (as a percent)	42.00%	49.10%	41.30%
ESPP | Minimum
Weighted average assumptions used for determining fair value of options
Risk-free interest rate (as a percent)	0.49%	0.51%	0.07%
Expected term (in years)	6 months	6 months	6 months
Expected volatility (as a percent)	24.60%	33.30%	27.10%

Income Taxes - Classification &

Income Taxes - Classification & Deferred Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Components of loss before provision for income taxes
Domestic	$ (35,227)	$ (32,710)	$ (46,178)
Foreign	6,686	9,542	8,388
Loss before provision for income taxes	(28,541)	(23,168)	(37,790)
Current:
State	14	17	33
Foreign	1,292	2,723	1,722
Total current	1,306	2,740	1,755
Deferred:
Foreign	(268)	(404)	664
Total deferred	(268)	(404)	664
Total provision for income taxes	1,038	2,336	2,419
Income tax payable	1,200	2,300	400
Reconciliation of income taxes at the statutory federal income tax rate to the provision for income taxes
At federal statutory rate	(9,988)	(8,108)	(13,226)
State tax, net of federal benefit	14	17	33
Stock-based compensation expense	802	701	579
Debt extinguishment		338
Other non-deductible permanent items	771	877	779
Change in valuation allowance	11,070	10,370	14,744
Credits	(359)	(795)	(79)
Other	83	20
Foreign taxes	(1,355)	(1,084)	(411)
Total provision for income taxes	1,038	2,336	$ 2,419
Deferred tax assets:
Federal and state net operating losses	122,465	117,524
Accrued expenses and reserves	8,374	6,392
Deferred revenue	5,095	4,853
Credits	18,862	18,168
Share-based compensation expense	5,460	6,323
Capitalized research and development	7,441	5,882
Unicap	2,456	2,666
Fixed assets/intangibles	2,451	(961)
Other	1,334	859
Total deferred tax assets	173,938	161,706
Deferred tax liabilities:
Debt discount	(494)	(1,805)
Section 481 adjustment	(768)	(1,140)
Total deferred tax liabilities	(1,262)	(2,945)
Valuation allowance	(171,733)	(158,264)
Net deferred tax assets	943	$ 497
Income tax uncertainties
Cumulative amount of undistributed earnings upon which no U.S. income taxes provided	$ 26,500

Income Taxes - Loss Carryforwar

Income Taxes - Loss Carryforwards (Details) $ in Millions	Jun. 30, 2017USD ($)
Operating loss carryforwards
Amount expected to be credited to additional paid-in-capital	$ 0.9
Federal
Operating loss carryforwards
Net operating loss carryforwards	329.8
State
Operating loss carryforwards
Net operating loss carryforwards	$ 154.5

Income Taxes - Tax Credits and

Income Taxes - Tax Credits and Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Valuation allowance
Valuation allowance percentage established for domestic and foreign net deferred tax assets	100.00%
Aggregate changes in the balance of gross unrecognized tax benefits
Balance at beginning of year	$ 16,643	$ 17,023	$ 17,169
Tax positions related to current year: Additions	1,190	1,811	726
Tax positions related to prior years: Additions	299	449	29
Tax positions related to prior years: Reductions	(2,313)	(2,640)	(901)
Balance at end of year	15,819	16,643	$ 17,023
Reduction in uncertain tax position due to lapse of various statutes of limitation	$ 100
Subsequent period within which no material changes in unrecognized tax benefits are expected	12 months
Uncertain tax benefits that, if realized, would affect the effective tax rate	$ 11,900
Accrued interest and penalties related to uncertain tax positions	200	$ 500
Swiss total assessment settlement	$ 100
Minimum
Aggregate changes in the balance of gross unrecognized tax benefits
Statutes of limitations with respect to jurisdictions (in years)	4 years
Maximum
Aggregate changes in the balance of gross unrecognized tax benefits
Statutes of limitations with respect to jurisdictions (in years)	10 years
Federal | Research and development
Income Tax Contingency
Tax credits	$ 18,600
State | Research and development
Income Tax Contingency
Tax credits	$ 18,700

Other Expense, Net (Details)

Other Expense, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Other Expense, Net
Interest expense on debt	$ (17,302)	$ (17,460)	$ (16,518)
Foreign currency transaction loss	(1,267)	(2,014)	(2,551)
Other (expense) income	(149)	1,179	448
Total other expense, net	$ (18,718)	$ (18,295)	$ (18,621)

Debt (Details)

Debt (Details) - USD ($) $ / shares in Units, shares in Millions	Jun. 14, 2017	Jan. 11, 2016	Apr. 17, 2014	Aug. 01, 2011	Jun. 30, 2017	Aug. 31, 2016	Jan. 31, 2016	Feb. 28, 2013	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Aug. 07, 2017
Debt
Cash and cash equivalents					$ 72,084,000					$ 72,084,000	$ 119,771,000
Other long-term assets					15,095,000					15,095,000	10,549,000
Carrying amount of equity conversion component					7,844,000					7,844,000
Principal amount of the Notes					166,548,000					166,548,000
Unamortized debt costs					(555,000)					(555,000)
Unamortized debt discount					(1,422,000)					(1,422,000)
Net carrying amount					164,571,000					164,571,000
Interest expense related to contractual interest coupon										9,465,000	9,411,000	$ 7,774,000
Interest expense related to amortization of debt discount										4,052,000	6,321,000	7,241,000
Interest expense related to amortization of debt issuance costs										3,785,000	1,728,000	1,503,000
Total interest expense recognized										17,302,000	$ 17,460,000	$ 16,518,000
MidCap Revolving Credit Facility
Debt
Initial borrowing capacity	$ 52,000,000
Additional borrowing capacity	33,000,000
Borrowing capacity	85,000,000
Minimum additional tranches	$ 1,000,000
Minimum drawn balance (as a percent)	30.00%
Collateral management fee (as a percent)	0.10%
Unused line fee (as a percent)	0.50%
Refinancing of loans (as a percent)	100.00%
Percentage of commitment amount required to pay within first year	3.00%
Percentage of commitment amount required to pay within second year	2.00%
Percentage of commitment amount required to pay after second year	1.00%
Principal amount of the Notes					51,548,000					51,548,000
Net carrying amount					51,548,000					$ 51,548,000
90-day LIBOR | MidCap Revolving Credit Facility
Debt
Variable rate (as a percent)	4.50%
Margin on interest rate	1.00%
Secured Loan
Debt
Aggregate principal amount of debt issued		$ 70,000,000
Quarterly installment payment		875,000
Proceeds from debt, net of costs		65,500,000
Initial purchaser's discount and commission		$ 1,400,000
Amortization period		5 years
Prepayment premium if loan repaid or accelerated within the first year		2.00%
Prepayment premium if loan repaid or accelerated within the second year		1.00%
Repayment of Secured Loan					60,600,000
Prepayment premium paid					600,000
Interest expense related to amortization of debt discount					1,300,000
Total interest expense recognized					200,000
Payments of Debt Issuance Costs		$ 3,100,000			$ 2,200,000
Secured Loan | Option (ii)
Debt
Interest rate (as a percent)		3.25%
Secured Loan | Maximum | 3.50% Convertible Notes
Debt
Debt instrument maturity before reference instrument maturity date		120 days
Secured Loan | One month LIBOR | Option (i)
Debt
Margin on interest rate		7.00%
Secured Loan | One month LIBOR | Option (ii)
Debt
Margin on interest rate		1.00%
Secured Loan | LIBOR | Minimum | Option (i)
Debt
Interest rate (as a percent)		1.00%
Secured Loan | Federal Funds Rate | Option (ii)
Debt
Margin on interest rate		0.50%
Secured Loan | US Prime Rate | Option (ii)
Debt
Margin on interest rate		4.75%
3.75% Convertible Note and 3.50% Convertible Note
Debt
Charge associated with repurchase of notes									$ 1,000,000
3.75% Convertible Notes
Debt
Aggregate principal amount of debt issued				$ 100,000,000		$ 36,600,000
Interest rate (as a percent)				3.75%	3.75%					3.75%	3.75%
Proceeds from debt, net of costs				$ 96,100,000
Debt issuance costs, amortization period				5 years
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock										30 days
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period										5 days
Number of consecutive trading days before five consecutive business days during the note measurement period										5 days
Principal amount used for debt instrument conversion ratio					$ 1,000					$ 1,000
Number of working days preceding maturity date for delivery of shares or payment of cash										33 days
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)										105.5548
Conversion price (in dollars per share)					$ 9.47					$ 9.47
Repurchase price, as percentage of principal amount, if company undergoes change of control										100.00%
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable										20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable										30 days
Discount rate on liability component (as a percent)				10.00%
Carrying amount of equity conversion component				$ 24,100,000
Debt issuance costs and discount allocated to equity conversion component				900,000
Principal amount of the Notes retired						36,600,000	$ 63,400,000
Cash paid to Participating Holders in connection with debt refinancing						37,300,000	$ 66,600,000
Potentially dilutive shares outstanding							6.7
Principal amount of the Notes				$ 75,900,000
Total interest expense recognized						$ 700,000
3.75% Convertible Notes | Minimum
Debt
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock										20 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible										130.00%
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be redeemable										130.00%
3.75% Convertible Notes | Maximum
Debt
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate										98.00%
3.50% Convertible Notes
Debt
Aggregate principal amount of debt issued								$ 115,000,000
Interest rate (as a percent)			3.50%		3.50%			3.50%		3.50%	3.50%
Proceeds from debt, net of costs								$ 110,500,000
Debt issuance costs, amortization period								5 years
Principal amount used for debt instrument conversion ratio					$ 1,000					$ 1,000
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)										187.6877
Conversion price (in dollars per share)					$ 5.33					$ 5.33
Repurchase price, as percentage of principal amount, if company undergoes change of control										100.00%
Principal amount of the Notes					$ 44,654,000					$ 44,654,000
Aggregate principal amount of debt refinanced			$ 70,300,000
Conversion rate, amount of debt to be issued per $1000 of principal amount			1,000
Unamortized debt costs					(555,000)					(555,000)
Net carrying amount					$ 44,099,000					$ 44,099,000
3.50% Series A Convertible Notes
Debt
Aggregate principal amount of debt issued			$ 70,300,000
Interest rate (as a percent)			3.50%		3.50%					3.50%	3.50%
Amortization period										7 months
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock										20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock										30 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible										130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period										5 days
Number of consecutive trading days before five consecutive business days during the note measurement period										5 days
Number of working days preceding maturity date for delivery of shares or payment of cash										17 days
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)										187.6877
Conversion price (in dollars per share)					$ 5.33					$ 5.33
Repurchase price, as percentage of principal amount, if company undergoes change of control										100.00%
Discount rate on liability component (as a percent)										7.00%
Carrying amount of equity conversion component					$ 7,844,000					$ 7,844,000
Principal amount of the Notes					70,346,000					70,346,000
Payments made to convertible note holders			$ 400,000
Portion of cash amount paid allocated to debt discount					400,000					400,000
Portion of cash amount paid allocated to equity component					47,000					47,000
Unamortized debt discount					(1,422,000)					(1,422,000)
Net carrying amount					$ 68,924,000					$ 68,924,000
Effective interest rate (as a percent)					7.10%					7.10%
3.50% Series A Convertible Notes | Maximum
Debt
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate										98.00%
Existing 3.50% Convertible Notes
Debt
Interest rate (as a percent)					3.50%					3.50%			3.50%

Employee Benefit Plan (Details)

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Employee Benefit Plan
Employer's contribution to the 401(k) Plan	$ 2	$ 2.1	$ 2.3

Defined Benefit Pension Oblig64

Defined Benefit Pension Obligation - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Pension Obligation
Actuarial (gain) loss	$ (900)
Change in benefit obligation:
Actuarial (gain) loss	(900)
Defined benefit pension plan
Defined Benefit Pension Obligation
Actuarial (gain) loss	(846)	$ 1,163
Change in benefit obligation:
Benefit Obligation- Beginning of fiscal year	12,435	8,861
Service cost	1,996	1,903	$ 980
Interest cost	49	76	107
Plan participants' contributions	1,945	2,239
Plan amendment		(490)
Actuarial (gain) loss	(846)	1,163
Foreign currency changes	265	(347)
Benefit and expense payments	(1,865)	(970)
Benefit Obligation- End of fiscal year	13,979	12,435	8,861
Change in plan assets:
Plan assets - beginning of fiscal year	9,572	7,184
Employer contributions	1,283	1,226	1,200
Actual return on plan assets	137	176
Plan participants' contributions	1,945	2,239
Foreign currency changes	221	(283)
Benefit and expense payments	(1,865)	(970)
Plan assets - end of fiscal year	11,293	9,572	$ 7,184
Funded status	$ 2,686	$ 2,863

Defined Benefit Pension Oblig65

Defined Benefit Pension Obligation - Amounts Recognized (Details) - Defined benefit pension plan - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Amounts recognized within consolidated balance sheets:
Long-term other liabilities	$ (2,686)	$ (2,863)
Net amount recognized	2,686	2,863
Amounts recognized in accumulated other comprehensive loss (before tax)
Net loss	(2,066)	(1,517)
Prior service cost (credit)	949	(549)
Accumulated other comprehensive loss	1,117	2,066
Accumulated benefit obligations in excess of fair value of plan assets:
Projected benefit obligation	13,979	12,435
Accumulated benefit obligation	11,293	9,572
Fair value of plan assets	$ 11,293	$ 9,572

Defined Benefit Pension Oblig66

Defined Benefit Pension Obligation - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - Defined benefit pension plan - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Net Periodic Benefit Costs:
Service cost	$ 1,996	$ 1,903	$ 980
Interest cost	49	76	107
Expected returns on assets	(132)	(102)	(92)
Amortization of prior service cost (credit)	(46)
Amortization of net loss	114	53	3
Net periodic benefit costs	1,981	1,930	998
Other Amounts Recognized in Other Comprehensive Loss:
Net (gain) loss arising during the year	(881)	1,093	953
Prior service cost (credit)	46	(491)
Amortization of net (gain) loss	(114)	(53)	(3)
Total recognized in other comprehensive loss	(949)	549	950
Total recognized in net periodic benefit costs and other comprehensive loss	1,032	$ 2,479	$ 1,948
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2018
Net loss	1,582
Prior service cost (credit)	(429)
Accumulated other comprehensive loss	$ (1,153)

Defined Benefit Pension Oblig67

Defined Benefit Pension Obligation - Assumptions (Details) - Defined benefit pension plan	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Net Periodic Benefit Costs:
Discount rate (as a percent)	0.70%	0.40%	0.90%
Rate of compensation increase (as a percent)	2.00%	2.00%	2.00%
Expected long-term return on assets (as a percent)	1.40%	1.40%	1.50%
Benefit Obligation:
Discount rate (as a percent)	1.40%	1.40%
Rate of compensation increase (as a percent)	2.00%	2.00%

Defined Benefit Pension Oblig68

Defined Benefit Pension Obligation - Estimated Contributions and Future Benefit Payments (Details) - Defined benefit pension plan - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Estimated Contributions
Contributions to defined benefit pension plan	$ 1,283	$ 1,226	$ 1,200
Expected total contributions to defined benefit pension plan for fiscal year 2018	1,200
Future Benefit Payments
2,018	1,048
2,019	965
2,020	905
2,021	858
2,022	819
Thereafter	4,283
Total	$ 8,878

Defined Benefit Pension Oblig69

Defined Benefit Pension Obligation - Plan Assets (Details) - Defined benefit pension plan - BVG	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Plan Assets
Plan assets expected investment percentage	100.00%
Required capital percentage	100.00%
Guaranteed interest rate for mandatory retirement savings (as a percent)		1.25%
Guaranteed interest rate for supplementary retirement savings (as a percent)		0.75%

Segment Disclosure (Details)

Segment Disclosure (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)
Segment Information
Number of operating segments | segment									1
Revenue	$ 112,094	$ 97,312	$ 87,502	$ 86,506	$ 94,973	$ 105,284	$ 108,912	$ 89,631	$ 383,414	$ 398,800	$ 379,801
Long lived tangible assets	23,062				27,878				23,062	27,878
Americas
Segment Information
Revenue									151,442	159,517	174,000
Long lived tangible assets	18,435				23,842				18,435	23,842
Europe, Middle East, India and Africa
Segment Information
Revenue									104,026	138,877	110,534
Long lived tangible assets	730				551				730	551
Asia (excluding Japan and India)
Segment Information
Revenue									59,278	62,888	57,618
Long lived tangible assets	1,533				1,342				1,533	1,342
Japan
Segment Information
Revenue									68,668	37,518	$ 37,649
Long lived tangible assets	$ 2,364				$ 2,143				$ 2,364	$ 2,143

Restructuring Charges (Details)

Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Restructuring and Severance Charges
Accrued restructuring charges	$ 0	$ 2.5
Employee severance
Restructuring and Severance Charges
Workforce affected by re-alignment (as a percent)	3.00%
Restructuring charges	$ 0	$ 2.5	$ 1.4

Quarterly Financial Data (una72

Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Data (unaudited)
Net revenue	$ 112,094	$ 97,312	$ 87,502	$ 86,506	$ 94,973	$ 105,284	$ 108,912	$ 89,631	$ 383,414	$ 398,800	$ 379,801
Gross profit	43,185	35,425	31,387	31,344	37,300	44,944	42,571	33,898	$ 141,341	$ 158,713	$ 145,402
Net income (loss)	$ (5,255)	$ (5,029)	$ (9,369)	$ (9,926)	$ (7,207)	$ 756	$ (6,027)	$ (13,026)
Net income (loss) per share - basic					$ (0.09)	$ 0.01	$ (0.08)	$ (0.16)
Net income (loss) per share - diluted					$ (0.09)	$ 0.01	$ (0.08)	$ (0.16)
Net loss per share - basic and diluted	$ (0.06)	$ (0.06)	$ (0.11)	$ (0.12)					$ (0.36)	$ (0.32)	$ (0.51)
Shares used in basic per share calculation					81,081	80,860	80,346	79,760
Shares used in diluted per share calculation					81,081	82,071	80,346	79,760
Shares used in basic and diluted per share calculation	83,179	82,913	82,328	81,576					82,495	80,509	78,277

Subsequent Event (Details)

Subsequent Event (Details) - USD ($) $ in Thousands	Aug. 07, 2017	Jun. 30, 2017
Subsequent Event
Outstanding debt		$ 164,571
Existing 3.50% Convertible Notes
Subsequent Event
Interest rate (as a percent)	3.50%	3.50%
Subsequent Event | 3.75% Convertible Senior Notes due 2022
Subsequent Event
Aggregate principal amount of debt issued	$ 85,000
Interest rate (as a percent)	3.75%
Subsequent Event | 3.75% Convertible Senior Notes due 2022 | Debt Conversion with Existing Convertible Notes
Subsequent Event
Aggregate principal amount of debt issued	$ 53,000
Subsequent Event | 3.75% Convertible Senior Notes due 2022 | Debt Conversion with Qualified New Investors
Subsequent Event
Aggregate principal amount of debt issued	32,000
Subsequent Event | Existing 3.50% Convertible Notes
Subsequent Event
Aggregate principal amount of debt issued	47,000
Repurchase of additional existing notes	28,000
Outstanding debt	$ 40,000