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Other Current Assets - Summary of Other Current Assets (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 471,686 $ 582,616
Deposits 23,841 26,846
Total other current assets $ 495,527 $ 609,462