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Intangible Assets - Summary Amortization Expense Related to Net Intangible Asset (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 6,216,000  
2018 5,033,000  
2019 3,239,000  
2020 1,737,000  
2021 1,176,000  
Thereafter 522,000  
Intangible assets, net $ 17,922,282 $ 15,686,954