CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (15,805)	$ (12,436)	$ (36,527)	$ (25,404)
Foreign currency translation adjustments related to continuing operations	6	18	75	93
Comprehensive loss	$ (15,799)	$ (12,418)	$ (36,452)	$ (25,311)