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Share-Based Compensation - Summary of shares available for grant (Details) - 2018 Plan
12 Months Ended
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant, Number of Shares [Roll Forward]  
Shares available for grant, beginning balance (in shares) 3,297,638
Authorized (in shares) 2,144,521
Granted (in shares) (512,945)
Shares withheld to cover taxes (in shares) 16,742
Forfeited (in shares) 75,314
Shares available for grant, ending balance (in shares) 5,021,270