Summary of the Status of the Company's Stock Option Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Weighted Average Exercise Price
Granted	$ 3.27
Stock Option Plan
Shares
Outstanding at Beginning of Period	3,435,443	3,411,943
Cancelled	(8,313)	(49,000)
Exercised	(109,038)	(2,500)
Granted	30,843	75,000
Outstanding at end of period	3,348,935	3,435,443
Weighted Average Exercise Price
Outstanding at beginning of period	$ 1.22	$ 1.23
Cancelled	$ 1.10	$ 2.04
Exercised	$ 1.42	$ 1.12
Granted	$ 3.27	$ 1.31
Outstanding at end of period	$ 1.23	$ 1.22