Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Assumptions (Details)

v3.21.2
Stock-Based Compensation - Assumptions (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield $ 0 $ 0
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 90.01% 74.61%
Expected term (in years) 5 years 8 months 8 days 5 years 6 months 18 days
Risk-free rate 0.69% 0.25%
Weighted average grant date fair value per share (in dollars per share) $ 2.07 $ 0.16
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 93.02% 74.89%
Expected term (in years) 5 years 11 months 23 days 5 years 10 months 13 days
Risk-free rate 0.82% 0.39%
Weighted average grant date fair value per share (in dollars per share) $ 3.00 $ 0.18