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Other Current Liabilities - Summary of Other Current Liabilities (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Accrued payroll expenses $ 7,032,508 $ 10,667,203
Deferred revenue 1,893,508 1,798,443
Dividends payable 1,286,381 1,280,410
Trade sales payable 1,276,170 1,082,702
Deferred rent 1,349,515 1,164,609
Other accrued expenses 5,961,113 5,180,052
Other current liabilities $ 18,799,195 $ 21,173,419