PRC VIE Structure and Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
VIE Structure and Arrangements
Net loss	$ 256,725	$ 111,581	$ 96,829
(Loss) gain on disposal of subsidiaries, net	(1,264)	276	(952)
Total income tax expense (benefit)	$ (11,786)	$ (3,308)	417
VIE
VIE Structure and Arrangements
Net loss			2,000
(Loss) gain on disposal of subsidiaries, net			600
Total income tax expense (benefit)			$ 200