Annual report pursuant to Section 13 and 15(d)

Share-based compensation - Additional information (Details)

v3.22.1
Share-based compensation - Additional information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
$ / shares
shares
May 06, 2019
shares
Mar. 31, 2020
USD ($)
director
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2022
shares
Jan. 01, 2021
shares
Nov. 11, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized share-based compensation related to options | $       $ 4,500        
Options repriced (in shares) 1,012,956              
Options repriced, exercise price premium 20.00%              
Options repriced, exercise price (in dollars per share) | $ / shares $ 3.60              
Options repriced, increase in fair value of vested options | $ $ 200              
Options repriced, increase in fair value of unvested options | $ $ 200              
Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Period of recognition for unrecognized share-based compensation       1 year 1 month 6 days        
Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $     $ 500          
Number of directors received awards | director     3          
Restricted stock | Non-employee directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted (in shares)     75,000          
Restricted stock | Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted (in shares)     993          
2019 Incentive Award Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized issuance shares of common stock (in shares)   1,083,334            
Percent of common stock outstanding   10.00%            
2019 Incentive Award Plan | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $       $ 4,000 $ 7,500      
Amended and Restated Incentive Award Plan 2019                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized issuance shares of common stock (in shares)             2,700,000 1,500,000
Amended and Restated Incentive Award Plan 2019 | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized issuance shares of common stock (in shares)           5,614,637    
Minimum | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       2 years        
Maximum | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years        
Maximum | 2019 Incentive Award Plan | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expiration term       10 years