Operating Matters, Liquidity and Going Concern - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Apr. 13, 2012	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Line of Credit Facility [Line Items]
Accumulated deficit		$ (108,898,245)		$ (107,696,665)
Amount borrowed under credit facility	1,316,255	14,300,000
Loss from operations		$ (1,087,593)	$ (1,310,113)	$ 5,100,000	$ 5,000,000