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 Weighted Average Assumptions (Details)

v3.20.1
Stock-Based Compensation - Fair Value of Stock Options Granted is Calculated Using Black Scholes Option Pricing Model with Weighted Average Assumptions (Details)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term (years)   5 years 10 months 24 days
Expected volatility, Minimum 83.80% 79.90%
Expected volatility, Maximum 87.10% 81.90%
Risk-free interest rate, Minimum 0.70% 2.40%
Risk-free interest rate, Maximum 1.60% 2.60%
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term (years) 5 years  
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term (years) 5 years 10 months 24 days