Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Narrative (Details)

v3.23.1
Stock-Based Compensation - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
purchasePeriod
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)   50,000              
Granted (in dollars per share) | $ / shares   $ 1.70              
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares             $ 0.54 $ 0.51  
Options vested in period, fair value | $             $ 42,000 $ 11,000  
2018 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issuance of common stock shares (in shares)             874,279    
Common stock reserved for issuance (in shares) 4,382,662   762,038       4,382,662 762,038  
Granted (in shares)             50,000    
Granted (in dollars per share) | $ / shares             $ 1.70    
Unrecognized compensation expense | $ $ 4,680,000           $ 4,680,000    
Amortization period of restricted stock cost             2 years 2 months 12 days    
2018 Employee Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for issuance (in shares) 802,893   189,215       802,893 189,215  
Maximum payroll deductions (as a percent)                 15.00%
Maximum yearly contribution | $                 $ 25,000
Maximum number of shares participant may purchase                 4,000
Offering period                 24 months
Number of purchase periods | purchasePeriod                 4
Purchase period for award                 6 months
ESPP, purchase price (as a percent)                 85.00%
Unrecognized compensation expense | $ $ 349,000           $ 349,000    
Amortization period of restricted stock cost             1 year 10 months 24 days    
2009 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)             0    
Granted (in dollars per share) | $ / shares             $ 0    
Unvested shares (in shares) 0   0       0 0  
Unrecognized compensation expense | $ $ 1,000           $ 1,000    
Amortization period of restricted stock cost             8 months 12 days    
Employee Stock | 2018 Employee Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of outstanding shares 1.50%           1.50%    
Annual increase (in shares) 818,825           818,825    
Restricted Stock Units (RSUs) - Team Members                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unit awards granted (in shares) 39,000 1,267,000 170,000 54,000 54,000 3,488,262      
Units grant date fair value (in dollars per share) | $ / shares $ 1.52 $ 1.57 $ 3.97 $ 1.09 $ 1.23 $ 2.03 $ 1.52 $ 3.97  
Vesting period of award 48 months   47 months 47 months 47 months        
Restricted Stock Units (RSUs) - Team Members | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period of award   39 months       10 months      
Restricted Stock Units (RSUs) - Team Members | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period of award   49 months       51 months      
Restricted Stock Units (RSUs) - Non-Employee Directors                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unit awards granted (in shares) 397,598 25,000 368,672            
Units grant date fair value (in dollars per share) | $ / shares $ 1.48 $ 1.70 $ 1.35       $ 1.48 1.35  
Restricted Stock Units (RSUs) - Non-Employee Directors | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unit awards granted (in shares)           652,170      
Units grant date fair value (in dollars per share) | $ / shares           $ 1.22      
Restricted Stock Units (RSUs) - Non-Employee Directors | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unit awards granted (in shares)           97,744      
Units grant date fair value (in dollars per share) | $ / shares           $ 1.22      
Restricted Stock Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unit awards granted (in shares)             1,728,598    
Units grant date fair value (in dollars per share) | $ / shares $ 1.75   $ 1.94       $ 1.75 $ 1.94  
Vested in period (in shares)             1,803,212    
Restricted Stock Units | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vested in period (in shares)             39,438    
Restricted Stock Units | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vested in period (in shares)             39,445    
Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Aggregate intrinsic value of options | $ $ 50,000   $ 1,168,000       $ 50,000 $ 1,168,000  
Total fair value for options | $             $ 17,000 $ 66,000  
Outstanding Shares on Last Day of Immediately Preceding Year | Employee Stock | 2018 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of outstanding shares                 5.00%