Income Taxes - Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 31,590	$ 31,252
Inventory and other allowances	28	29
Charitable contribution carryforwards	6	6
Excess (tax) book depreciation	709	601
Excess (tax) book amortization	67	62
Share-based compensation	1,396	1,326
Other accrued costs	225	279
Total deferred tax assets	34,021	33,555
Less: Valuation allowance	(34,021)	(33,555)
Deferred income taxes	$ 0	$ 0