11. Net Loss Per Common Share Data (Detail) - (Table 1) Table of Computations of Basic and Diluted Net Loss Per Common Share (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net loss	$ (1,042,306)	$ (3,059,137)	$ (2,338,538)	$ (3,380,644)	$ (2,578,676)	$ (2,329,419)	$ (2,210,339)	$ (1,935,330)	$ (9,820,625)	$ (9,053,764)
Deemed preferred stock redemption										(6,906,566)
Net loss attributable to common stockholders									$ (9,820,625)	$ (15,960,330)
Denominator:
Weighted-average common shares outstanding (in Shares)									7,998,662	2,164,232
Basic and diluted net loss per common share (in Dollars per share)	$ (0.13)	$ (0.38)	$ (0.30)	$ (0.43)	$ (1.19)	$ (1.08)	$ (4.21)	$ (0.89)	$ (1.23)	$ (7.37)