Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes

Schedule of reconciliation of statutory federal income tax rate

	Year Ended December 31,
	2016		2015		2014
Tax at statutory federal rate	(34.0)	%	(34.0)	%	(34.0)	%
State taxes, net of federal benefit	(1.5)		(1.9)		(2.7)
Stock-based compensation	1.3		0.8		2.8
Nondeductible fair value adjustment	(2.5)		—		—
Nondeductible interest	2.0		—		—
Change in valuation allowance	33.3		34.3		37.9
Other	1.4		0.8		(4.0)
Provision for income taxes	(0.0)	%	(0.0)	%	(0.0)	%

Schedule of tax effects of temporary differences and carryforwards

The tax effects of temporary differences and carryforwards that give rise to significant portions of the deferred tax assets are as follows (in thousands):

	December 31,
	2016		2015
Deferred tax assets:
Net operating loss carryforwards	$	29,469	$	23,526
Inventory		1,187		1,309
Accruals		902		1,693
Depreciation and amortization		105		290
Other		1,312		752
Gross deferred tax assets		32,975		27,570
Valuation allowance		(32,850)		(27,554)
Deferred tax assets		125		16
Deferred tax liabilities:
Prepaid expenses		(125)		(16)
Deferred tax liabilities		(125)		(16)
Net deferred tax assets	$	—	$	—