Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Deferred tax assets
Stock-based compensation	$ 5,107	$ 3,375
Accrued expenses	1,650	2,795
Inventories	433	382
Compensation accruals	261	254
Depreciation and amortization	409	360
Other	1,019	487
Research and development credit carryforwards	4,650	4,483
Net operating loss carryforwards	87,502	89,081
Total deferred tax assets	101,031	101,217
Valuation allowance	(101,031)	(101,217)	$ (84,319)	$ (68,699)
Net deferred tax assets	$ 0	$ 0