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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 12 Months Ended
Aug. 06, 2014
LegalMatter
Jun. 30, 2014
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitment And Contingencies [Line Items]          
Rent expense under operating leases       $ 50,000 $ 47,000
Number of putative class action complaints filed | LegalMatter 3        
Norcross          
Commitment And Contingencies [Line Items]          
Operating lease agreements, period     26 months    
Operating lease agreements, Expiry date   Nov. 30, 2017 Nov. 30, 2014    
Base rent   $ 3,300 $ 3,000    
Operating lease agreements, Security Deposit     $ 6,000