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Convertible Notes Payable - Schedule of Future Minimum Payments on Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Aug. 14, 2017
Future Minimum Payments
Long Term Debt	$ 176,180	$ 166,006
Convertible debt \| 3.00% Convertible notes
Future Minimum Payments
2019	9,150
2020	9,150
2021	9,150
2022	9,150
2023	9,150
2024 and Thereafter	314,150
Total minimum payments	359,900
Less: interest	(54,900)
Less: unamortized discount	(128,820)
Less: current portion	0
Long Term Debt	$ 176,180		$ 166,300