Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Fair Value of Stock Options Granted is Calculated Using Black Scholes Option Pricing Model with Range of Assumptions (Details)

v3.21.2
Stock-Based Compensation - Fair Value of Stock Options Granted is Calculated Using Black Scholes Option Pricing Model with Range of Assumptions (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected volatility, Minimum 87.10% 88.10% 87.10% 83.80%
Expected volatility, Maximum 87.70% 90.80% 88.10% 90.80%
Risk-free interest rate, Minimum 1.00% 0.40% 0.50% 0.40%
Risk-free interest rate, Maximum 1.10% 0.50% 1.10% 1.60%
Expected dividend yield     0.00% 0.00%
Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term (years) 5 years 6 months 5 years 6 months 5 years 6 months 5 years
Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term (years) 6 years 1 month 6 days 6 years 6 years 1 month 6 days 6 years