Annual report pursuant to Section 13 and 15(d)

Share-based compensation - Additional information (Details)

v3.21.1
Share-based compensation - Additional information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
$ / shares
shares
Dec. 19, 2019
$ / shares
May 06, 2019
USD ($)
Mar. 31, 2020
USD ($)
director
shares
May 05, 2019
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 20, 2019
shares
Nov. 11, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Equity awards issued (in shares) | shares         1,300,000        
Equity awards issued, weighted average value per share (in dollars per share) | $ / shares         $ 2.47        
Share-based compensation expense as a result of immediate vesting     $ 2,200            
Options repriced (in shares) | shares 6,077,731                
Options repriced, exercise price premium 20.00%                
Options repriced, exercise price (in dollars per share) | $ / shares $ 0.60                
Options repriced, increase in fair value of vested options $ 200                
Options repriced, increase in fair value of unvested options 200                
Unrecognized share-based compensation related to options           $ 2,700      
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) | shares       450,000          
Restricted stock | Officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Awards granted (in shares) | shares       5,956          
2019 Incentive Award Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Authorized issuance shares of common stock (in shares) | shares           6,000,000      
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           $ 7,500 $ 10,300    
Amended and Restated Incentive Award Plan 2019                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of awards available for issuance (in shares) | shares               9,000,000 6,000,000
Exercise price, lower limit (in dollars per share) | $ / shares   $ 1.82              
Increase in fair value of vested options 600                
Increase in fair value of unvested options $ 800                
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period           2 years      
Minimum | Stock options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period           2 years      
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period           3 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