Annual report pursuant to Section 13 and 15(d)

Derivative Liability and Fair Value Measurements (Schedule of Fair Value Level 3 Warrant Liabilities) (Detail)

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Derivative Liability and Fair Value Measurements (Schedule of Fair Value Level 3 Warrant Liabilities) (Detail) (Warrant Liabilities, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Warrant Liabilities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value -beginning of period $ 0 $ 0
Warrants issued 9,067,283 0
Reclassification of warrant liabilities to Additional Paid-in Capital (526,245) 0
Reclassification of warrant exercises to Additional Paid-in Capital (80,500) 0
Change in fair value 3,575,278 0
Fair value - end of period $ 12,035,816 $ 0