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Notes Payable - Schedule of Maturities of Notes Payable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
2017 $ 392  
2018 288  
Total 680  
Less: current portion (392) $ (1,369)
Notes payable, net of current portion $ 288 $ 569