Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Weighted Average Assumptions Used in Estimating Fair Value of Stock Options (Details)

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Stock Based Compensation - Weighted Average Assumptions Used in Estimating 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, Fair value assumptions and methodology      
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility 40.78% 37.60% 39.37%
Expected term (years) 5 years 11 months 15 days 5 years 10 months 9 days 6 years 21 days
Risk-free interest rate 2.10% 2.60% 1.90%