Summary of Share Based Compensation Option Unvested (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Shares - Unvested
Granted	8,000	8,000
Forfeited	117,667	107,000
Unvested Stock Options
Shares - Unvested
Beginning Balance	69,200	190,100
Granted	8,000	8,000
Vested	(69,200)	(128,900)
Forfeited
Ending Balance	8,000	69,200
Weighted Average Grant-Date Fair Value
Beginning Balance	0.73	1.11
Granted	1.28	1.97
Vested	0.73	1.37
Forfeited
Ending Balance	1.28	0.73