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Debt - Schedule of Future Principle Payments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total future principal payments $ 5,183 $ 5,803
Term Loan [Member]    
Debt Instrument [Line Items]    
Remainder of 2017 2,044  
2018 3,259  
Total future principal payments $ 5,303