Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of deferred tax assets

Significant components of the Company’s deferred tax assets as of December 31, 2016 and 2015 are summarized below (in thousands):

	2016			2015
Stock-based compensation	$	4,135		$	2,825
Research credits		5,493			5,401
Depreciation		(36	)		(12	)
Net operating loss carryforwards		54,509			47,261
Inventory reserve		1,958			203
Other		847			845
Total deferred tax assets		66,906			56,523
Valuation allowance		(66,906	)		(56,523	)
Net deferred tax assets	$	—		$	—