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Commitments and Contingencies - Summary of Components of Rent Expense (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Rent expense $ 1,955,747us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 2,612,899us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 2,932,104us-gaap_OperatingLeasesRentExpenseMinimumRentals
Sublease income   (53,726)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (411,885)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Rent expense, net $ 1,955,747us-gaap_OperatingLeasesRentExpenseNet $ 2,559,173us-gaap_OperatingLeasesRentExpenseNet $ 2,520,219us-gaap_OperatingLeasesRentExpenseNet