Income Taxes - Componentes of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Allowance for doubtful accounts	$ 365	$ 389
Inventory reserve	3,161	2,814
Accrued liabilities	2,794	2,846
Other	4,697	5,446
Gross current deferred income tax assets	11,017	11,495
Valuation allowance	(11,017)	(10,960)
Net current deferred income tax assets	0	535
Net operating losses	91,893	91,085
Depreciation and amortization	(163)	370
Capital loss carryforwards	0	38,755
Gross long-term deferred income tax assets	91,730	130,210
Valuation allowance	(91,730)	(128,105)
Net long-term deferred income tax asset	0	2,105
Total deferred income taxes	$ 0	$ 2,640