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Convertible Senior Notes - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Long-term debt        
Amortization of debt issuance costs     $ 224 $ 37
Convertible debt | 3.00% Convertible senior notes due 2022        
Long-term debt        
Contractual interest expense $ 1,131 $ 584 3,372 584
Amortization of debt issuance costs 77 37 224 37
Amortization of debt discount 1,546 736 4,487 736
Total $ 2,754 $ 1,357 $ 8,083 $ 1,357
Effective interest rate of the liability component 11.00% 11.00% 11.00% 11.00%