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Debt - Convertible Senior Notes - Interest and Amortization Expense (Details) - Convertible senior notes - 2025 Notes - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 07, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
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 $ 722 $ 3,596 $ 722
Amortization of debt issuance costs   127 69 375 69
Amortization of debt discount   1,532 834 4,507 834
Total interest and amortization expense   $ 2,862 $ 1,625 $ 8,478 $ 1,625