Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v3.21.1
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of options exercised $ 214    
Fair value of options vested $ 20    
2018 Stock Option and Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of common stock shares (in shares) 1,087,607    
Common stock reserved for issuance (in shares) 1,134,393   2,551,720
2018 Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for issuance (in shares) 272,942   272,942
2009 Stock Option and Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested shares (in shares) 574   574
Accrued expenses $ 1   $ 1
Unamortized fair value of restricted stock units $ 8,852    
Weighed-average period of costs amortized 2 years 6 months    
Unrecognized stock compensation expense $ 64    
Restricted Stock Units (RSUs) - Team Members      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock unit awards granted (in shares)   3,488,262  
Restricted stock units awards grant date fair value (in dollars per share)   $ 2.03  
Restricted Stock Units (RSUs) - Team Members | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of award 10 months    
Restricted Stock Units (RSUs) - Team Members | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of award 51 months    
Restricted Stock Units (RSUs) - Non-Employee Directors | Share-based Payment Arrangement, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock unit awards granted (in shares)   652,170  
Restricted stock units awards grant date fair value (in dollars per share)   $ 1.22  
Restricted Stock Units (RSUs) - Non-Employee Directors | Share-based Payment Arrangement, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock unit awards granted (in shares)   97,744  
Restricted stock units awards grant date fair value (in dollars per share)   $ 1.22  
Post-Closing Outstanding Shares | Employee Stock | 2018 Stock Option and Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual percentage increase 10.00%    
Outstanding Shares on Last Day of Immediately Preceding Year | Employee Stock | 2018 Stock Option and Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual percentage increase 5.00%