Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	$ (17,740)	$ (10,277)	$ 269
Other comprehensive loss, net of tax
Foreign currency translation adjustments	(768)	(141)	(342)
Unrealized (loss) gain on marketable securities	(20)	21	0
Comprehensive loss	(18,528)	(10,397)	(73)
Comprehensive (loss) income attributable to non-controlling interest	(582)	30	1,544
Comprehensive loss attributable to common stockholders	$ (17,946)	$ (10,427)	$ (1,617)