Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Weighted Average Assumptions (Details)

v3.20.4
Share-Based Compensation - Weighted Average Assumptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Expected term (in years) 3 years 4 years 4 years
Volatility 52.00% 52.00% 55.00%
Risk-free interest rate 0.55% 1.61% 2.04%
Dividend yield $ 0.000 $ 0.000 $ 0.000