Quarterly report pursuant to Section 13 or 15(d)

Contractual Obligations (Additional Information) (Detail)

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Contractual Obligations (Additional Information) (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Commitment Contingencies Disclosure [Line Items]    
Lease Expiration Date Oct. 03, 2020  
Operating Leases, Rent Expense $ 344,227 $ 371,239
Operating Lease Commencement Date Oct. 03, 2015