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Commitments and Contingencies - Summary of Components of Rent Expense (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases [Abstract]      
Rent expense $ 2,612,899 $ 2,932,104 $ 4,193,433
Sublease income (53,726) (411,885) (424,847)
Rent expense, net $ 2,559,173 $ 2,520,219 $ 3,768,586