Basic and Diluted Loss Per Common Share - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from the calculation	66,238,507	26,042,116
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from the calculation	15,322,206	15,140,956
8% Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from the calculation	3,705,000	2,941,665