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Borrowings - Schedule of Future Minimum Payments under the Loans Payable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 216,861 $ 257,655
Convertible Notes [Member]    
Debt Instrument [Line Items]    
2017 2,736  
2018 2,736  
2019 2,736  
2020 63,527  
Loans payable, gross including contractual interest 71,735  
Less interest (10,943)  
Less unamortized discount (13,842)  
Long-term debt 46,950  
2022 Notes [Member]    
Debt Instrument [Line Items]    
2017 20,125  
2018 20,125  
2019 62,617  
2020 57,586  
2021 and thereafter 100,078  
Loans payable, gross including contractual interest 260,531  
Less interest (85,531)  
Less unamortized discount (5,089)  
Long-term debt $ 169,911