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Debt Obligations - Schedule of Interest Cost Recognized Relating to Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Contractual interest coupon $ 1,186
Amortization of interest discount 1,893
Amortization of debt issuance costs 261
Total interest cost recognized $ 3,340