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Equity Incentive Plans - Summary of Activity Under Stock Option Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of Options, granted     66,982  
Number of Options, exercised (67,792) (279,947) (263,626) (280,836)
Weighted-Average Exercise Price Per Share, Options exercised $ 1.60 $ 1.55 $ 1.86 $ 1.55
2020 Plan and 2014 Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options Available for Grant, Beginning Balance     835,941  
Options Available for Grant, Additional shares authorized     5,997,435  
Options Available for Grant, granted     (2,065,590)  
Options Available for Grant, forfeited     71,863  
Options Available for Grant, Ending Balance 4,839,649   4,839,649  
Number of Options, Beginning Balance     3,297,586  
Number of Options, granted     2,065,590  
Number of Options, exercised     (263,626)  
Number of Options, forfeited     (71,863)  
Number of Options, Ending Balance 5,027,687   5,027,687  
Number of Options, Vested and expected to vest 5,027,687   5,027,687  
Number of Options, Exercisable 1,782,595   1,782,595  
Weighted-Average Exercise Price Per Share, Beginning Balance     $ 1.93  
Weighted-Average Exercise Price Per Share, Options granted     6.57  
Weighted-Average Exercise Price Per Share, Options exercised     1.86  
Weighted-Average Exercise Price Per Share, Options forfeited     2.47  
Weighted-Average Exercise Price Per Share, Ending Balance $ 3.83   3.83  
Weighted-Average Exercise Price Per Share, Vested and expected to vest 3.83   3.83  
Weighted-Average Exercise Price Per Share, Exercisable $ 1.85   $ 1.85  
Weighted-Average Remaining Contractual Term (Years)     8 years 2 months 19 days  
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest     8 years 2 months 19 days  
Weighted-Average Remaining Contractual Term (Years), Exercisable     6 years 8 months 12 days  
Aggregate Intrinsic Value $ 228,992   $ 228,992  
Aggregate Intrinsic Value, Vested and expected to vest 228,992   228,992  
Aggregate Intrinsic Value, Exercisable $ 84,725   $ 84,725