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Commitments and Contingencies - Future Minimum Lease Payments Under Operating Leases (Detail) (USD $)
Mar. 31, 2015
Leases [Abstract]  
2015 (remainder of) $ 292,119us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear
2016 596,877us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2017 613,664us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2018 637,897us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2019 459,633us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Total $ 2,600,190us-gaap_OperatingLeasesFutureMinimumPaymentsDue