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Fair Value of Financial Instruments - Summary of Company's Warrant Liability (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Beginning balance $ 20,233,338  
Issuances (Level 3) 1,465,000 18,742,526
Total (gains) or losses (Level 1 and 2) (21,698,338) 1,490,812
Ending balance   $ 20,233,338