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Notes Payable - Schedule of Maturities of Notes Payable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 278  
2019 288  
Total 566  
Less: current portion (278) $ (282)
Total notes payable, net current portion $ 288 $ 288