Annual report pursuant to Section 13 and 15(d)

Equity Compensation Plans - Summary of Weighted-Average Assumptions Used (Details)

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Equity Compensation Plans - Summary of Weighted-Average Assumptions Used (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-average assumptions      
Expected term (in years) 5 years 9 months 3 days 6 years 2 months 19 days 6 years 1 month 28 days
Expected volatility (as a percent) 54.97% 50.99% 50.43%
Risk free rate (as a percent) 1.71% 2.70% 2.12%