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 income (loss) 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, 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]
Unrealized income (loss) on available-for-sale securities	(52)
Foreign currency translation adjustment	476
Net loss	(141,125)
Ending balance (in shares) at Jul. 31, 2021		66,130,589
Ending balance at Jul. 31, 2021	673,724	$ 66	1,699,150	(1,319)	(280)	(1,023,893)
Beginning balance (in shares) at Apr. 30, 2021		62,096,273
Beginning balance at Apr. 30, 2021	(268,364)	$ 62	680,413	(1,319)	(760)	(946,760)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		282,519
Stock option exercises	2,206		2,206
Vesting of restricted stock units (in shares)		362,342
Vesting of restricted stock units	0
Stock-based compensation	57,705		57,705
Conversion of 2024 convertible senior notes (in shares)		844,194
Conversion of convertible senior notes	56,683	$ 1	56,682
Issuance of common stock, net of issuance costs (in shares)		2,500,000
Issuance of common stock, net of issuance costs	889,184	$ 3	889,181
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		45,261
Issuance of common stock under the Employee Stock Purchase Plan	12,963		12,963
Unrealized income (loss) on available-for-sale securities	(86)				(86)
Foreign currency translation adjustment	566				566
Net loss	(77,133)					(77,133)
Ending balance (in shares) at Jul. 31, 2021		66,130,589
Ending balance at Jul. 31, 2021	$ 673,724	$ 66	1,699,150	(1,319)	(280)	(1,023,893)
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
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 income (loss) 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
Ending balance at Apr. 30, 2022	$ 672,879	$ 68	1,945,737	(1,319)	(4,679)	(1,266,928)
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)	399,503
Unrealized income (loss) on available-for-sale securities	$ (1,201)
Foreign currency translation adjustment	(65)
Net loss	$ (196,159)
Ending balance (in shares) at Jul. 31, 2022	68,686,532	68,686,532
Ending balance at Jul. 31, 2022	$ 668,168	$ 69	2,059,405	(1,319)	(4,194)	(1,385,793)
Beginning balance (in shares) at Apr. 30, 2022		68,061,063
Beginning balance at Apr. 30, 2022	672,879	$ 68	1,945,737	(1,319)	(4,679)	(1,266,928)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		163,986
Stock option exercises	1,332		1,332
Vesting of restricted stock units (in shares)		388,483
Vesting of restricted stock units	1	$ 1
Stock-based compensation	96,554		96,554
Conversion of 2024 convertible senior notes (in shares)		18
Conversion of convertible senior notes	5		5
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		72,982
Issuance of common stock under the Employee Stock Purchase Plan	15,777		15,777
Unrealized income (loss) on available-for-sale securities	1,163				1,163
Foreign currency translation adjustment	(678)				(678)
Net loss	$ (118,865)					(118,865)
Ending balance (in shares) at Jul. 31, 2022	68,686,532	68,686,532
Ending balance at Jul. 31, 2022	$ 668,168	$ 69	$ 2,059,405	$ (1,319)	$ (4,194)	$ (1,385,793)