Income Taxes (Tables)

12 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Deferred tax assets and liabilities

	June 30,
	2018			2017
Deferred tax assets
Stock-based compensation	$	2,505		$	5,107
Deferred revenue	2,351			—
Accrued expenses	970			1,650
Inventories	305			433
Compensation accruals	133			261
Depreciation and amortization	320			409
Other	397			1,019
Research and development credit carryforwards	5,048			4,650
Net operating loss carryforwards	64,101			87,502
Total deferred tax assets	76,130			101,031
Valuation allowance	(76,130		)	(101,031		)
Net deferred tax assets	$	—		$	—

Summary of valuation allowances

Balances 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
Reductions	(24,901		)
Balance at June 30, 2018	$	76,130

Reconciliation of beginning and ending amount of unrecognized tax benefits

Balances at June 30, 2015	$	494
Increases related to prior year tax positions	10
Increases related to current year tax positions	41
Balances 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
Decreases related to prior year tax positions	(3		)
Increases related to current year tax positions	30
Balance at June 30, 2018	$	597