Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance (in shares) at Jun. 30, 2015		40,537
Balance at Jun. 30, 2015	$ 176,183	$ 41	$ 140,406	$ (1,540)	$ 37,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,299
Issuance of common stock upon exercise of stock options	1,549	$ 1	1,548
Release of restricted stock units (shares)		948
Release of restricted stock units	(3,295)	$ 1	(3,296)
Repurchases of common stock (in shares)		(76)
Repurchases of common stock	(570)	$ 0	(249)		(321)
Stock-based compensation expense	11,366		11,366
Foreign currency translation adjustment, net of tax	(512)			(512)
Unrealized net (loss) gain on available-for-sale securities, net of tax	285			285
Net loss	(35,321)				(35,321)
Balance (in shares) at Jun. 30, 2016		42,708
Balance at Jun. 30, 2016	149,685	$ 43	149,775	(1,767)	1,634
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		437
Issuance of common stock upon exercise of stock options	2,738	$ 0	2,738
Release of restricted stock units (shares)		801
Release of restricted stock units	(3,008)	$ 1	(3,009)
Stock-based compensation expense	10,162		10,162
Foreign currency translation adjustment, net of tax	188			188
Unrealized net (loss) gain on available-for-sale securities, net of tax	(355)			(355)
Net loss	(47,262)				(47,262)
Balance (in shares) at Jun. 30, 2017		43,946
Balance at Jun. 30, 2017	112,148	$ 44	159,666	(1,934)	(45,628)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-16 using the modified retrospective method	$ (296)				(296)
Issuance of common stock upon exercise of stock options (in shares)	151	151
Issuance of common stock upon exercise of stock options	$ 681	$ 0	681
Release of restricted stock units (shares)		774
Release of restricted stock units	(2,327)	$ 1	(2,328)
Stock-based compensation expense	9,876		9,876
Foreign currency translation adjustment, net of tax	542			542
Unrealized net (loss) gain on available-for-sale securities, net of tax	(460)			(460)
Net loss	(89,118)				(89,118)
Balance (in shares) at Jun. 30, 2018		44,871
Balance at Jun. 30, 2018	$ 31,046	$ 45	$ 167,895	$ (1,852)	$ (135,042)