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Loan facility - Schedule of Loan Facility (Detail) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Beginning balance $ 2,286,489 $ 0
Accrued interest 9,844  
Bank loan cash received - October 30, 2013   2,500,000
Accretion of warrant discount 213,511  
Warrant discount   (226,255)
Repayment fee and penalty 100,000  
Financing costs   12,744
Repayment of bank loan and interest (2,609,844)  
Ending balance $ 0 $ 2,286,489