Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Deferred tax assets
Stock-based compensation	$ 4,135	$ 5,202
Accrued expenses	1,779	1,403
Inventories	639	825
Depreciation and amortization	266	221
Other	238	301
Research and development credit carryforwards	3,825	3,299
Net operating loss carryforwards	57,817	53,560
Total deferred tax assets	68,699	64,811
Valuation allowance	(68,699)	(64,811)	(56,465)
Net deferred tax assets	$ 0	$ 0