Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 01, 2021	Aug. 02, 2020	Aug. 01, 2021	Aug. 02, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (45,265)	$ (64,967)	$ (129,471)	$ (155,561)
Other comprehensive income (loss):
Unrealized net gains (losses) on available-for-sale securities	(1,192)	2,715	(3,411)	7,605
Less: reclassification adjustment for net gains on available-for-sale securities included in net loss	(95)	(703)	(518)	(869)
Change in unrealized net gains (losses) on available-for-sale securities	(1,287)	2,012	(3,929)	6,736
Comprehensive loss	$ (46,552)	$ (62,955)	$ (133,400)	$ (148,825)