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Debt - Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Debt Instrument [Line Items]        
Contractual interest expense $ 1,650 $ 367 $ 3,300 $ 367
Amortization of debt discount 1,980 440 3,960 440
Amortization of debt issuance costs 131 29 263 29
Total interest expense $ 3,761 $ 836 $ 7,523 $ 836