Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total Stockholders’ Equity
Balance at Jun. 30, 2015		$ 79	$ 471,430	$ (426)	$ (395,303)	$ 75,780
Balance (in shares) at Jun. 30, 2015		79,477,838
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)	(25,504)
Cumulative translation adjustment	(47)			(48)		(48)
Unrealized gain (loss) on investments, net of tax				63		63
Reclassification adjustments on available for sale investments, net of tax	62
Change in defined benefit pension obligation	(549)			(549)		(549)
Balance at Jun. 30, 2016		$ 81	481,346	(960)	(420,807)	59,660
Balance (in shares) at Jun. 30, 2016		81,378,208
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		$ 1	3,345			3,346
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)	(29,579)
Cumulative translation adjustment	33			33		33
Unrealized gain (loss) on investments, net of tax				(74)		(74)
Reclassification adjustments on available for sale investments, net of tax	(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
Exercise of Stock options, net			437			437
Exercise of Stock options, net (in shares)		108,800
Issuance of restricted stock		$ 1	(1)
Issuance of restricted stock (in shares)		1,166,776
Issuance of common stock under employee stock purchase plan		$ 1	3,333			3,334
Issuance of common stock under employee stock purchase plan (in shares)		921,583
Share-based compensation			12,289			12,289
Tax withholding upon vesting of restricted stock units			(293)			(293)
Tax withholding upon vesting of restricted stock units (in shares)		(61,536)
Retirement of Convertible Senior Notes			288			288
Retirement of Convertible Senior Notes (in shares)		253,829
Allocated transaction cost in debt issuance			8,798			8,798
Net loss	$ (23,899)				(23,899)	(23,899)
Cumulative translation adjustment	83			83		83
Reclassification adjustments on available for sale investments, net of tax	89			89		89
Change in defined benefit pension obligation	973			973		973
Balance at Jun. 30, 2018	$ 48,632	$ 86	$ 521,738	$ 1,093	$ (474,285)	$ 48,632
Balance (in shares) at Jun. 30, 2018	86,129,256	86,129,256