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Debt - Convertible Senior Notes - Interest and Amortization Expense (Details) - Convertible senior notes - 2025 Notes - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 07, 2017
Jun. 30, 2018
Jun. 30, 2018
Debt      
Debt issuance costs $ 5,400    
Equity component, reduction to additional paid in capital 1,900    
Liability component, reduction to carrying value of debt $ 3,500    
Interest expense      
Contractual interest expense   $ 1,203 $ 2,393
Amortization of debt issuance costs   125 248
Amortization of debt discount   1,496 2,975
Total interest and amortization expense   $ 2,824 $ 5,616