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Borrowings - Schedule of Future Minimum Payments under the Loans Payable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Less current portion   $ (13,315)
Long-term debt, net of current portion $ 257,655 $ 106,687
Convertible Notes [Member]    
Debt Instrument [Line Items]    
2016 5,625  
2017 5,625  
2018 5,625  
2019 5,625  
2020 and thereafter 130,625  
Loans payable, gross including contractual interest 153,125  
Less interest (28,125)  
Less unamortized discount (36,505)  
Less current portion 0  
Long-term debt, net of current portion 88,495  
2022 Notes [Member]    
Debt Instrument [Line Items]    
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 (5,840)  
Less current portion 0  
Long-term debt, net of current portion $ 169,160