Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Apr. 05, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)	10,000,000		10,000,000		10,000,000
Preferred stock, par value (in dollars per share)	$ 0.00001		$ 0.00001		$ 0.00001
Preferred stock, shares issued (in shares)	0		0		0
Preferred stock, shares outstanding (in shares)	0		0		0
Shares available for grant	20,153,991		20,153,991		16,905,525
Employees percentage of eligible compensation may elect to contribute			100.00%
Shares reserved for issuance	52,128,638		52,128,638		47,293,685
Aggregate intrinsic value of employee options exercised			$ 44,744
cumulative stock-based compensation expense			16,803
Share-Based Payment Arrangement, Expense	$ 27,505	$ 39,175	49,483	$ 44,459
Compensation cost related to the nonvested awards not yet recognized	38,220		$ 38,220
Weighted average period for recognition of compensation cost			1 year 10 months 24 days
Modification charge	7,781		$ 7,781
Internal-use Software
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
cumulative stock-based compensation expense	1,981	$ 1,835	$ 3,230	$ 2,361
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, expiration period			10 years
Vesting period			4 years
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
Cliff vesting period			1 year
Compensation cost related to the nonvested awards not yet recognized	$ 225,090		$ 225,090
Weighted average period for recognition of compensation cost			2 years 10 months 24 days
2013 and 2014 Executive Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant	0		0
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance	16,516,807		16,516,807
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employees percentage of eligible compensation may elect to contribute			15.00%
Percent of the lower of the market price for Purchase shares of common stock			85.00%
Shares reserved for issuance	3,637,184		3,637,184
Compensation cost related to the nonvested awards not yet recognized	$ 19,024		$ 19,024
Weighted average period for recognition of compensation cost			1 year
IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)						10,000,000
Preferred stock, par value (in dollars per share)						$ 0.00001