Common Stock and Stockholders' Equity (Deficit) - Additional Information (Details)				1 Months Ended					12 Months Ended
	Dec. 15, 2022 USD ($)	Dec. 08, 2021 USD ($)	Nov. 20, 2019 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Nov. 30, 2021 $ / shares shares	Aug. 31, 2021 $ / shares shares	Mar. 31, 2021 $ / shares shares	Jan. 31, 2023 USD ($) vote $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Class A common stock available for issuance (in shares) | shares									45,377	42,248
Exercisable shares vested | shares									9,065,374
Weighted average fair value at grant date of options granted (dollars per share) | $ / shares										$ 18.46	$ 10.10
Total grant-date fair value of stock options vested									$ 4,600,000	$ 6,500,000	$ 10,500,000
Total intrinsic value of options exercised									94,100,000	168,300,000	81,500,000
Stock-based compensation expense, net of amounts capitalized									$ 171,161,000	$ 200,568,000	39,223,000
Unrecognized stock-based compensation expense, weighted-average period									1 year 2 months 12 days	1 year 7 months 6 days
Share-based compensation									$ 171,161,000	$ 200,568,000	$ 39,223,000
Unrecognized stock-based compensation expense									1,300,000	5,200,000
Accrued compensation and benefits									$ 58,628,000	$ 56,939,000
Nonemployees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted (in shares) | shares									0	0	0
2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for sale | shares									21,466	17,561
2014 and 2021 Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based awards, contractual term									10 years
Vesting period of stock options									4 years
Total intrinsic value of options exercised									$ 94,070,000
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Class A common stock available for issuance (in shares) | shares									3,008	1,900
Proceeds from issuance of common stock related to early exercised stock options				$ 8,500,000	$ 8,700,000
Unrecognized stock-based compensation expense, weighted-average period									1 year 10 months 24 days
Share-based compensation									$ 13,200,000
Unrecognized stock-based compensation expense									23,900,000
Stock issued (in shares) | shares				362,801	351,284
Fair value of common stock (dollars per share) | $ / shares				$ 23.97	$ 24.20
Accrued compensation and benefits									$ 4,200,000	$ 2,700,000
Look-back feature									2 years
Incremental compensation cost due to modification	$ 5,200,000	$ 4,900,000
IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares authorized (in shares) | shares									100,000,000
Preferred stock, par value (dollars per share) | $ / shares									$ 0.000015
Secondary Transactions
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized											$ 32,100,000
Share-based compensation									$ 0	0	$ 32,051,000
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted (in shares) | shares							5,250	5,314
Weighted-average grant-date fair value, granted (dollars per share) | $ / shares							$ 47.07	$ 28.94
Restricted stock units outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of stock options									4 years
Cumulative stock-based compensation expense									$ 190,500,000	190,500,000
Grant-date fair value of vested shares									144,300,000	$ 71,100,000
Share based compensation, number of shares modified (in shares) | shares						414,632
Weighted-average grant-date fair value before modification (dollars per share) | $ / shares						$ 23.95
Weighted-average grant-date fair value after modification (dollars per share) | $ / shares						$ 80.00
Stock-based compensation expense, net of amounts capitalized									3,700,000
Share based compensation cost will be recognized over remaining life									3,000,000
Value of RSUs forfeited									$ 4,200,000
Unrecognized stock-based compensation expense, weighted-average period									2 years 7 months 6 days	2 years 6 months
Unrecognized stock-based compensation expense									$ 352,200,000	$ 287,700,000
Restricted stock units outstanding | 2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Class A common stock available for issuance (in shares) | shares									11,588	10,406
Share based compensation, number of shares modified (in shares) | shares			3,208,340
Weighted-average grant-date fair value before modification (dollars per share) | $ / shares			$ 7.24
Weighted-average grant-date fair value after modification (dollars per share) | $ / shares			$ 9.13
Stock-based compensation expense, net of amounts capitalized									$ 600,000
Share based compensation cost will be recognized over remaining life									$ 100,000
Restricted stock units outstanding | 2014 and 2021 Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted (in shares) | shares									7,392
Weighted-average grant-date fair value, granted (dollars per share) | $ / shares									$ 41.28
Early Exercise Of Employee Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock upon initial public offering, net of underwriting discounts and issuance costs (in shares) | shares											190,000
Proceeds from issuance of common stock related to early exercised stock options											$ 200,000
Vesting of early exercised stock options									$ 0	$ 0	$ 100,000
Common stock subject to repurchase (in shares) | shares									0	5,250
Employee Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase period									24 months
Common Class A
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Voting rights | vote									1
Class B common stock converted to Class A (in shares) | shares									50,424,950
Common Class A | 2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for sale | shares									3,007,528	3,370,329
Common Class A | 2021 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Class A common stock available for issuance (in shares) | shares									24,473,693
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Voting rights | vote									10