Income Taxes (Tables)

12 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Deferred tax assets and liabilities

	June 30,
	2017			2016
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		)
Net deferred tax assets	$	—		$	—

Summary of valuation allowances

Balances at June 30, 2014	$	68,699
Additions	15,620
Balance at June 30, 2015	84,319
Additions	16,898
Balance at June 30, 2016	101,217
Reductions	(186		)
Balance at June 30, 2017	$	101,031

Reconciliation of beginning and ending amount of unrecognized tax benefits

Balances at June 30, 2014	$	458
Increases related to prior year tax positions	4
Increases related to current year tax positions	32
Balances at June 30, 2015	494
Increases related to prior year tax positions	10
Increases related to current year tax positions	41
Balance at June 30, 2016	545
Decreases related to prior year tax positions	(8		)
Increases related to current year tax positions	33
Balance at June 30, 2017	$	570