Income Taxes - Significant Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for doubtful accounts	$ 152	$ 55
Inventory reserves	3,289	918
Accrued liabilities	382	57
Warrant interest expense	269	269
Stock compensation expense	2,478	2,689
State net operating loss-net of tax	7,456	5,923
Net operating loss carryforward	40,417	31,658
Tax credits	671	581
Valuation allowance	(52,286)	(27,151)
Total deferred tax assets	2,828	14,999
Deferred tax liability:
Depreciation	(3,320)	(15,423)
Prepaid expenses	(62)	(169)
Net deferred tax liability	$ (554)	$ (593)