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0.25% Convertible Senior Notes, Convertible Note Hedge and Warrant - Schedule of Interest Expense (Detail) - 0.25% Convertible Senior Notes Due 2022 [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Debt Instrument [Line Items]    
Contractual interest expense $ 250 $ 390
Amortization of debt discount 4,465 6,963
Amortization of issuance costs 334 519
Total interest expense $ 5,049 $ 7,872