Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Details)

v3.21.2
Stock-based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percent of employee match             50.00% 50.00%
Matching contribution to 401(k) plan   $ 152   $ 155        
401(k) expense $ 34   $ 56   $ 141 $ 155    
Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation expense 1,221       $ 1,221      
Unrecognized compensation expense, period of recognition         1 year 5 months 12 days      
RSU                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation expense $ 2,436       $ 2,436      
Unrecognized compensation expense, period of recognition         2 years 2 months 19 days      
Right to receive stock (in shares) 1       1      
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued in employee benefit plan (in shares)   26,000   26,000 26,000 26,000    
Additional Paid-in Capital                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Matching contribution to 401(k) plan   $ 152   $ 155        
Equity Incentive Plan 2014                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for grant (in shares) 1,974,000       1,974,000      
Shares available for grant (in shares) 669,000       669,000