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Convertible Notes Payable - Schedule of Future Minimum Payments on Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Aug. 14, 2017
Future Minimum Payments
Long Term Debt	$ 183,556	$ 179,806
Convertible debt \| 3.00% Convertible notes
Future Minimum Payments
2019	4,575
2020	9,150
2021	9,150
2022	9,150
2023	9,150
2024 and Thereafter	314,150
Total minimum payments	355,325
Less: interest	(50,325)
Less: unamortized discount	(121,444)
Less: current portion	0
Long Term Debt	$ 183,556		$ 166,300