Stockholders’ deficit and stock-based compensation - Common sock activity (Details) - shares	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	162,244,822	162,105,399
Common stock, shares outstanding (in shares)	162,244,822	162,105,399
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common stock, shares issued (in shares)	161,849,487	152,218,214
Common stock, shares outstanding (in shares)	161,849,487	152,218,214
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	395,335	9,887,185
Common stock, shares outstanding (in shares)	395,335	9,887,185