Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - 2018 Equity Incentive Plan [Member] - shares
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Weighted Average Assumptions Used in Black-Scholes Option-pricing Model [Abstract]        
Expected stock price volatility 98.30% 94.40% 97.70% 95.30%
Expected life of options 5 years 6 months 5 years 9 months 18 days 5 years 10 months 24 days 6 years 1 month 6 days
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Risk free interest rate 4.40% 3.70% 4.20% 3.70%
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]        
Stock options vested (in shares) 141,817 374,757 306,372 620,824
Stock options forfeited (in shares) 124,030 254,966 468,935 254,966
Former Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]        
Stock options vested (in shares)       145,418
Stock options forfeited (in shares)       249,633