Stockholders’ deficit and stock-based compensation - Plans (Details) - shares	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2021	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Shares reserved for issuance (in shares)		80,541,624	83,554,725
Restricted Stock Units
Class of Stock [Line Items]
Grants in period (in shares)		9,172,637	29,763,009
Executive Officers | Restricted Stock Units
Class of Stock [Line Items]
Grants in period (in shares)	10,500,000
2021 Employee Stock Purchase Plan
Class of Stock [Line Items]
Shares reserved for issuance (in shares)		3,715,944	3,715,944
Shares available for grant – 2021 Equity Incentive Plan
Class of Stock [Line Items]
Shares reserved for issuance (in shares)		21,720,450	14,357,382
Shares available for grant – 2021 Equity Incentive Plan | Common Stock
Class of Stock [Line Items]
Percent of possible increase in shares available for issuance		5.00%
ESPP | 2021 Employee Stock Purchase Plan | Common Stock
Class of Stock [Line Items]
Maximum deduction from compensation, percent		15.00%
Purchase price of common stock, percent		85.00%
Purchase price of common stock, applicable purchase date, percent		85.00%