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Intangible Assets, Net - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets Accumulated Amortization Addition $ 17,536,700 $ 16,244,563
Exclusivity [Member]    
Finite Lived Intangible Assets Accumulated Amortization Addition 424,000  
Relationships [Member]    
Impairment of Intangible Assets (Excluding Goodwill), Total $ 3,235,000