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Share-based compensation - Employee stock purchase plan (Details) - Employee Stock
12 Months Ended
May 25, 2021
Dec. 31, 2021
USD ($)
calendarYear
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Offering periods 6 months  
Discount percentage 15.00%  
Percentage of the fair market value of common stock 85.00%  
Maximum employee payroll deduction percentage 15.00%  
Aggregate value of shares purchased | $   $ 25,000
Eligible employee compensation | $   $ 1,200,000
Shares reserved for issuance (in shares) | shares   3,000,000
Number of purchase periods | calendarYear   10
Percentage of outstanding stock   1.00%
Shares authorized for issuance (in shares) | shares   16,000,000
Shares issued (in shares) | shares   0
Weighted-average grant-date fair value (in dollars per share) | $ / shares   $ 11.97
Unrecognized compensation expense | $   $ 700,000
Weighted average period over which unrecognized compensation expense would be recognized   4 months