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Share-Based Compensation - Assumptions to estimate the fair value of options (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation      
Risk-free interest rate, minimum (in percent) 1.50% 2.97% 2.26%
Risk-free interest rate, maximum (in percent) 2.90% 3.13% 2.57%
Expected volatility, minimum (in percent) 43.52% 46.23% 48.08%
Expected volatility, maximum (in percent) 57.59% 48.63% 49.35%
Expected dividend yield (in percent) 0.00% 0.00% 0.00%
Exercise multiple 2.80 2.80 2.80
Post-vesting forfeit rate 0.00% 0.00% 0.00%
Fair value of underlying Ordinary Share, minimum (in dollars per share) $ 4.8550 $ 1.5146 $ 0.0858
Fair value of underlying Ordinary Share, maximum (in dollars per share) 8.9875 5.7400 0.5359
Fair value of share option, minimum 4.8485 1.5091 0.0808
Fair value of share option, maximum $ 8.9810 $ 5.7335 $ 0.5302