CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (105,891)	$ (38,151)
Net foreign currency translation adjustments	(8,388)	266
Net unrealized gain on revaluation of intercompany loans	0	75
Net unrealized gain on marketable debt securities	3,327	2,288
Total comprehensive loss	$ (110,952)	$ (35,522)