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Debt - Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Contractual interest expense $ 6,600 $ 3,667
Amortization of debt discount 7,920 4,400
Amortization of debt issuance costs 527 292
Total interest expense $ 15,047 $ 8,359