CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 39,008	$ (105,891)
Net foreign currency translation adjustments	(10,595)	(8,388)
Net unrealized gain (loss) on marketable debt securities	(2,534)	3,327
Total comprehensive income (loss)	$ 25,879	$ (110,952)