CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (17,714)	$ (8,602)	$ (41,970)	$ (22,003)
Other comprehensive loss
Currency translation adjustments	(77)	0	(119)	0
Total comprehensive loss	$ (17,791)	$ (8,602)	$ (42,089)	$ (22,003)