Earnings Per Share - Basic and Diluted Components (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss attributable to common shareholders	$ (18,288)	$ (18,155)	$ (18,070)	$ (31,004)	$ (16,860)	$ (15,578)	$ (25,881)	$ (19,848)	$ (85,517)	$ (78,167)	$ (130,178)
Denominator:
Weighted average number of common stock outstanding									237,152,780	218,882,337	216,343,985