Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Share-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
2018 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Common stock available for future issuance (in shares) 0  
2020 Plan Evergreen Provision [Member]    
Weighted-average Assumptions Used in Black-Scholes Option-pricing Model [Abstract]    
Expected stock price volatility 86.60% 0.00%
Expected life of options (years) 5 years 7 months 6 days 0 years
Expected dividend yield 0.00% 0.00%
Risk free interest rate 0.80% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Stock options vested (in shares) 118,217 66,601
Weighted average fair value per share of options vesting (in dollars per share) $ 3.66 $ 0.87
Stock options forfeited (in shares) 0 7,923
Common stock available for future issuance (in shares) 1,274,408  
Unrecognized share-based compensation cost $ 2.3  
Weighted average period to recognized share-based compensation 1 year 4 months 24 days  
Inducement Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]    
Common stock available for future issuance (in shares) 1,274,408