CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2021		60,898,451
Beginning balance at Jan. 31, 2021	$ (5,033)	$ 61	$ 932,332	$ (1,319)	$ (704)	$ (935,403)	$ (256,746)	$ (309,381)	$ 52,635
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		483,787
Stock option exercises	$ 3,540	$ 1	$ 3,539
Vesting of early exercised stock options	(10,000)		(10,000)
Vesting of restricted stock units (in shares)		341,939
Vesting of restricted stock units	$ 0
Stock-based compensation	50,914		$ 50,914
Conversion of 2024 convertible senior notes (in shares)		372,096
Conversion of convertible senior notes	2,999		2,999
Unrealized (loss) gain on available-for-sale securities	34				34
Foreign currency translation adjustment	(90)				(90)
Net loss	(63,992)					(63,992)
Ending balance (in shares) at Apr. 30, 2021		62,096,273
Ending balance at Apr. 30, 2021	$ (268,364)	$ 62	680,413	(1,319)	(760)	(946,760)
Beginning balance (in shares) at Jan. 31, 2022	67,444,360	67,444,360
Beginning balance at Jan. 31, 2022	$ 666,700	$ 67	1,860,514	(1,319)	(2,928)	(1,189,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)	235,517	235,517
Stock option exercises	$ 1,656		1,656
Vesting of restricted stock units (in shares)		381,178
Vesting of restricted stock units	1	$ 1
Stock-based compensation	83,566		83,566
Conversion of 2024 convertible senior notes (in shares)		8
Conversion of convertible senior notes	1		1
Unrealized (loss) gain on available-for-sale securities	(2,364)				(2,364)
Foreign currency translation adjustment	613				613
Net loss	$ (77,294)					(77,294)
Ending balance (in shares) at Apr. 30, 2022	68,061,063	68,061,063
Ending balance at Apr. 30, 2022	$ 672,879	$ 68	$ 1,945,737	$ (1,319)	$ (4,679)	$ (1,266,928)