Stockholders' equity - Founders and underwriter shares subject to earnout provisions (Details) - $ / shares	Dec. 31, 2021	Mar. 05, 2021
Earnout Shares
Class of Stock [Line Items]
Shares issued subject to earnout provisions (in shares)		1,200,000
Contingent earnout shares expected to vest, threshold trading term	20 days
Contingent earnout shares expected to vest, trading period	30 days
Earnout Shares One
Class of Stock [Line Items]
Contingent earnout shares expected to vest (in shares)	399,999
Contingent earnout shares expected to vest, exercise price (in dollars per share)	$ 12.00
Earnout Shares Two
Class of Stock [Line Items]
Contingent earnout shares expected to vest (in shares)	400,000
Contingent earnout shares expected to vest, exercise price (in dollars per share)	$ 13.50
Earnout Shares Three
Class of Stock [Line Items]
Contingent earnout shares expected to vest (in shares)	400,001
Contingent earnout shares expected to vest, exercise price (in dollars per share)	$ 15.00