Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation, Weighted-Average Assumptions Used in Black-Scholes Option-pricing Model (Details)

v3.22.2.2
Stock-based Compensation, Weighted-Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
2018 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]        
Common stock available for future issuance (in shares) 0   0  
2020 Plan Evergreen Provision [Member]        
Weighted-average Assumptions Used in Black-Scholes Option-pricing Model [Abstract]        
Expected stock price volatility 91.20% 99.70% 97.40% 98.00%
Expected life of options 5 years 4 months 24 days 5 years 9 months 18 days 5 years 9 months 18 days 5 years 9 months 18 days
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Risk free interest rate 3.40% 0.90% 2.30% 0.90%
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]        
Stock options vested (in shares) 89,623 95,949 356,726 328,893
Stock options forfeited (in shares) 13,500   27,788 25,558
Common stock available for future issuance (in shares) 892,920   892,920  
Unrecognized stock-based compensation cost $ 3.0   $ 3.0  
Weighted average period to recognized stock-based compensation     1 year 3 months 18 days  
Inducement Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]        
Common stock available for future issuance (in shares) 892,920   892,920