Annual report pursuant to Section 13 and 15(d)

Commitments (Additional Information) (Detail)

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Commitments (Additional Information) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitment Contingencies Disclosure [Line Items]      
Lease Expiration Date Oct. 03, 2020    
Operating Leases, Rent Expense, Minimum Rentals $ 335,248    
Operating Leases, Rent Expense $ 461,246 $ 482,147 $ 186,471
Operating Lease Commencement Date Oct. 03, 2015    
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years    
Lessee Leasing Arrangements, Operating Leases, Renewal Term 3 years    
Purchase Obligation $ 7,000,000