Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Summary of Weighted-Average Assumptions Used (Details)

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Stock Incentive Plan - Summary of Weighted-Average Assumptions Used (Details)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Weighted-average assumptions    
Expected term (in years) 6 years 2 months 19 days 6 years 1 month 28 days
Expected volatility (as a percent) 49.73% 50.72%
Risk free rate (as a percent) 2.69% 2.07%