Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v3.20.2
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate intrinsic value of options exercised       $ 87  
Fair value of options vested       $ 98  
2018 Stock Option and Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of common stock shares (in shares)       1,213,026  
Common stock reserved for issuance (in shares) 101,873     101,873 205,206
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     272,942 272,942
Expiration period       27 months  
ESPP, purchase price percentage       85.00%  
2009 Stock Option and Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award       4 years  
Expiration period       10 years  
Unvested shares (in shares) 1,198     1,198 6,219
Accrued expenses $ 1     $ 1 $ 3
Unamortized fair value of restricted stock units 3,234     $ 3,234  
Weighed-average period of costs amortized       2 years 7 months 6 days  
Unrecognized stock compensation expense $ 111     $ 111  
Selling and Marketing Expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares participant may purchase       2,000  
Employee Stock | 2018 Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual percentage increase 3.00%     3.00%  
Percent of shares outstanding on last day 1.50%     1.50%  
Restricted Stock Units (RSUs) - Non-Employee Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock unit awards granted (in shares) 39,426        
Restricted stock units awards grant date fair value (in dollars per share) $ 1.28     $ 1.28  
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)   85,996 123,084    
Restricted stock units awards grant date fair value (in dollars per share)   $ 0.71 $ 1.25    
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)   375,000 125,523    
Restricted stock units awards grant date fair value (in dollars per share)   $ 0.67 $ 1.25    
Vesting percentage of award (as a percent)   25.00%      
Vesting period of award   4 years 10 months    
Restricted Stock Units (RSUs) - Team Members          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock unit awards granted (in shares) 12,000   756,000    
Restricted stock units awards grant date fair value (in dollars per share) $ 1.68   $ 1.25 1.68  
Vesting percentage of award (as a percent) 25.00%        
Vesting period of award 4 years   42 months    
Restricted Stock Units (RSUs) - Non-Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock unit awards granted (in shares) 155,000 250,000 610,000    
Restricted stock units awards grant date fair value (in dollars per share) $ 1.52 $ 0.67 $ 0.89 $ 1.52  
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%     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%     5.00%