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Borrowings - Schedule of Future Minimum Payments under the Loans Payable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt $ 218,041 $ 216,861
Convertible Notes [Member]    
Debt Instrument [Line Items]    
Remainder of 2017 1,368  
2018 2,736  
2019 2,736  
2020 and thereafter 63,527  
Loans payable, gross including contractual interest 70,367  
Less interest (9,576)  
Less unamortized discount (12,863)  
Long-term debt $ 47,928