Annual report pursuant to Section 13 and 15(d)

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

v3.22.1
Share-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
2020 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Common stock available for future issuance (in shares) 890,542  
2018 Equity Incentive Plan [Member]    
Weighted-average Assumptions Used in Black-Scholes Option-pricing Model [Abstract]    
Expected stock price volatility 98.10% 86.80%
Expected life of options (years) 5 years 9 months 18 days 7 years 2 months 12 days
Expected dividend yield 0.00% 0.00%
Risk free interest rate 0.90% 0.60%
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Stock options vested (in shares) 468,301 379,576
Weighted average fair value per share of options vesting (in dollars per share) $ 3.49 $ 2.77
Stock options forfeited (in shares) 34,220 43,002
Unrecognized share-based compensation cost $ 2.4  
Weighted average period to recognized share-based compensation 1 year 1 month 6 days  
Inducement Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Common stock available for future issuance (in shares) 890,542