Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Estimated Fair Value of Stock Options (Details)

v3.19.3.a.u2
Stock-Based Compensation - Estimated Fair Value of Stock Options (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.70% 2.72% 1.88%
Volatility 52.90% 44.87% 45.95%
Expected term (in years) 6 years 1 month 6 days 6 years 1 month 2 days 5 years 11 months 9 days
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 2.59% 2.92% 2.22%
Volatility 55.07% 54.61% 50.52%
Expected term (in years) 6 years 1 month 13 days 6 years 1 month 9 days 6 years 29 days