Net Loss Per Share of Common Stock (Detail) - Summary of Earnings Per Share Reconcilation (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net loss (in Dollars)	$ (1,742,684)	$ (4,436,778)
Preferred stock cash dividends (in Dollars)	0	(96,424)
Net loss available to common stockholders (in Dollars)	$ (1,742,684)	$ (4,533,202)
Denominator:
Weighted average basic and diluted shares outstanding (in Shares)	33,278,477	32,342,541
Basic and diluted net loss per share:
Net loss	$ (0.05)	$ (0.14)
Preferred stock cash dividends	$ 0	$ 0.00
Net loss available to common stockholders	$ (0.05)	$ (0.14)