Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Accrued expenses	$ 251	$ 151
Warrants and stock options	963	353
Intangibles	117	110
Inventories	114	127
Net operating loss	4,565	3,270
Less valuation allowance	(4,341)	(3,270)
Total deferred tax assets	1,669	741
Deferred tax liabilities:
Depreciation	(4,406)	(4,061)
Total deferred tax liabilities	(4,406)	(4,061)
Net deferred tax liability	$ (2,737)	$ (3,320)