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Stock-Based Compensation - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
purchasePeriods
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 609 $ 491 $ 1,655 $ 999
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense   400   $ 400  
Weighted-average period expected to be recognized (in years)       1 year 1 month 6 days  
Percentage of employee's compensation, maximum 15.00%        
Offering period (in months) 24 months        
Number of purchase periods | purchasePeriods 4        
Percentage of lower of fair market value 85.00%        
Stock-based compensation expense   46,000   $ 100  
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense   $ 5,400   $ 5,400  
Weighted-average period expected to be recognized (in years)       2 years 7 months 6 days