• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Long-Term Debt - Summary of Equity and Liability Components of the Convertible Senior Notes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount $ 260,061 $ 147,985
Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal amount 233,740 89,990
Unamortized discount (17,354) (6,795)
Liability component - net carrying value before issuance costs 216,386 83,195
Equity component - conversion, net of offering costs $ 31,051 $ 15,900