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Equity Incentive Plan - 2019 Employee Stock Purchase Plan (Details) - USD ($)
3 Months Ended
Jun. 19, 2019
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   $ 2,482,000 $ 776,000
Class A common stock | 2019 Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance 283,333    
Stock-based compensation expense   $ 163,000  
Expected dividend   0.00%  
Class A common stock | 2019 Employee Stock Purchase Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of additional number of shares authorized annually 1.00%    
Additional number of shares authorized annually 416,666