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Debt Financing - Summary of Future Minimum Payments under Convertible Notes (Detail) - Convertible 2.0% Senior Notes [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
2016 $ 6,500
2017 6,500
2018 6,500
2019 331,500
Total 351,000
Less amounts representing interest (26,000)
Less: Deferred financing costs (4,212)
Less debt discount, net (91,006)
Net carrying amount of convertible notes balance $ 229,782