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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares reserved for future issuance 7,692,751     7,692,751     12,156,391
Stock-based compensation expenses $ 689   $ 86 $ 3,693 $ 222    
Stock Option Modification              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expenses $ 200 $ 2,300          
2020 Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares reserved for future issuance           7,874,862