Long Term Obligations - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 08, 2013 Subsequent Event	Dec. 31, 2012 Prime Rate	Dec. 31, 2012 Libor Rate
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument description	The secured notes payable to bank evidence borrowings under a revolving credit facility which permits us to borrow up to the lesser of (i) $25,000,000, or (ii) an amount equal to 85% of the value of our eligible accounts receivable and up to 55% of the value of our eligible inventory.
Line of credit borrowing capacity	$ 25,000,000
Percentage of eligible accounts receivable permitted to borrow under the line of credit	85.00%
Percentage of eligible inventory permitted to borrow under the line of credit	55.00%
Borrowing base of the company	16,800,000	15,300,000
Interest rate payable				3.25%	0.21%
Additional rate of interest				1.75%	3.25%
Credit facility maturity date	Jul. 10, 2014
Fixed charge coverage ratio maximum	1.10
Fixed charge coverage ratio minimum	1.0
Increase in interest rate	0.25%
Credit line borrowings reduced amount	1,000,000
Outstanding borrowings under revolving credit facility			$ 18,475,000