Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss and comprehensive loss	$ (7,321)	$ (8,977)	$ (67,789)	$ (19,560)
Deemed dividend (Note 13)			(3,564)
Loss attributable to stockholders of the Company	(7,243)	(8,640)	(70,585)	(19,823)
Comprehensive (loss) income attributable to non-controlling interest	(78)	(337)	(768)	263
Comprehensive loss	$ (7,321)	$ (8,977)	$ (71,353)	$ (19,560)