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Summary of Significant Accounting Policies - Summary of Preferred Stock Warrant Liability (Detail) (Warrant [Member], USD $)
9 Months Ended
Sep. 30, 2013
Warrant [Member]
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance beginning of year $ (52,947)
Total unrealized gains (losses) included in earnings (626,349)
Balance end of year $ (679,296)