Fair Value - Level 3 Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Participating preferred shares derivative liability
Preferred shares derivative liability beginning balance	$ 0	$ 29,470	$ 69,810
Conversions		(28,258)	(37,499)
Remeasurement included in earnings	$ 0	(1,212)	(2,841)
Preferred shares derivative liability ending balance		$ 0	$ 29,470