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Equity Incentive Plans - Unrecognized Stock-Based Compensation (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Options to Purchase Common Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense $ 14,605
Average Vesting Period 2 years 9 months 18 days
Employee Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense $ 186
Average Vesting Period 2 months 12 days