Stockholders' Equity (Deficit) and Equity Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Class Of Stock [Line Items]
Exercise of stock options, Shares		1,603,403
Total stock-based compensation expense		$ 13,503	$ 2,577
Employee Stock Option
Class Of Stock [Line Items]
Granted stock options		0
Total stock-based compensation expense		$ 500
Unrecognized stock-based compensation expense		1,200		$ 1,700
intrinsic value		25,600	$ 7,200
Weighted-average grant date fair value			$ 3.42
Fair value shares vested		4,600	$ 1,700
R S Us
Class Of Stock [Line Items]
Granted stock options			0
Total stock-based compensation expense		6,100	$ 0
Two Executives | Employee Stock Option
Class Of Stock [Line Items]
Granted stock options	1,756,545
2014 Stock Option Plan
Class Of Stock [Line Items]
Unrecognized share-based compensation expense		$ 31,300
Unrecognized share-based compensation expense recognition period (term)		2 years 6 months 7 days
Non-employee stock options outstanding		374,500
2014 Stock Option Plan | R S Us
Class Of Stock [Line Items]
Unrecognized share-based compensation expense		$ 101,400
Unrecognized share-based compensation expense recognition period (term)		2 years 7 months 17 days
Non-employee stock options outstanding		254,892
2021 Incentive Award Plan
Class Of Stock [Line Items]
Exercise of stock options, Shares		88,000,000
2021 Incentive Award Plan | Class A Common Stock
Class Of Stock [Line Items]
Shares reserved for issuance		18,643,596
2021 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Exercise of stock options, Shares		0
Initial offering period		The initial offering period under the ESPP will be longer than 12 months
Commencement date		Sep. 28, 2021
Ending date		Nov. 14, 2022
Purchase price		85.00%
Options, vesting period		4 years
Total stock-based compensation expense		$ 4,000
Unrecognized stock-based compensation expense		$ 1,400
weighted-average remaining vesting period		7 months 13 days
Non-employee stock options outstanding		2,500,000
2021 Employee Stock Purchase Plan | Class A Common Stock
Class Of Stock [Line Items]
Shares reserved for issuance		2,663,371
Purchase price		85.00%