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Borrowings - Schedule of Future Minimum Payments under the Loans Payable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 259,843 $ 257,655
Convertible Notes [Member]    
Debt Instrument [Line Items]    
Remainder of 2016 2,812  
2017 5,625  
2018 5,625  
2019 5,625  
2020 and thereafter 130,623  
Loans payable, gross including contractual interest 150,310  
Less interest (25,312)  
Less unamortized discount (34,494)  
Less current portion 0  
Long-term debt 90,504  
2022 Notes [Member]    
Debt Instrument [Line Items]    
Remainder of 2016 19,734  
2017 20,125  
2018 20,125  
2019 62,617  
2020 and thereafter 157,664  
Loans payable, gross including contractual interest 280,265  
Less interest (105,265)  
Less unamortized discount (5,661)  
Less current portion 0  
Long-term debt $ 169,339