Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	May 02, 2021	May 03, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (84,206)	$ (90,594)
Other comprehensive income (loss):
Unrealized net gains (losses) on available-for-sale securities	(2,219)	4,890
Less: reclassification adjustment for net gains on available-for-sale securities included in net loss	(423)	(166)
Change in unrealized net gains (losses) on available-for-sale securities	(2,642)	4,724
Comprehensive loss	$ (86,848)	$ (85,870)