Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value of Options Granted (Details)

v3.20.2
Stock-Based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value of Options Granted (Details) - Stock Options - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 94.57% 110.43% 93.86%
Risk free interest rate 1.84% 1.68% 1.95%
Dividend yield 0.00% 0.00% 0.00%
Term (years) 5 years 3 months 7 days 5 years 3 months 7 days 5 years 5 months 8 days
Weighted-average fair value of options granted during the period (usd per share) $ 3.23 $ 4.45 $ 4.32