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Basic and Diluted Loss Per Common Share - Additional Information (Detail)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Warrants [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common shares excluded from the calculation 60,240,698 66,238,507
Stock Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common shares excluded from the calculation 13,868,334 15,322,206
8% Convertible Preferred Stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common shares excluded from the calculation 0 3,705,000