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Commitments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]    
Lease commencement date Jan. 01, 2017  
Additional lease term 2 years  
Lease expiry date Dec. 31, 2018  
Rent expense $ 116,000 $ 81,000
Future minimum operating lease payment due in 2017 135,000  
Future minimum operating lease payment due in 2018 $ 139,000