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Debt - Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Contractual interest expense $ 1,650 $ 1,649 $ 4,950 $ 2,016
Amortization of debt discount 1,980 1,980 5,940 2,420
Amortization of debt issuance costs 132 132 395 161
Total interest expense $ 3,762 $ 3,761 $ 11,285 $ 4,597