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Share-based compensation - Plans (Details) - shares
1 Months Ended 12 Months Ended
Jan. 01, 2023
Aug. 31, 2021
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period     10 years
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted   13,500  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     4 years
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     1 year
2020 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Percentage Of Total Number Of Common Stock Outstanding     4.00%
Shares available for future issuance     1,325,192
Increase in shares available for future issuance 485,153    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant     352,445
Increase in shares available for future issuance 121,288    
Authorized stock options     125,000
Employee Stock Purchase Plan, Threshold Period For Which Common Stock Is Automatically Added To Arrive At Authorized Shares     10 years
Percentage of outstanding capital stock     1.00%
Number of common shares added in authorized     1,000,000
Awards granted     0