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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 17, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Percentage of units vest after one year           25.00%  
Percentage of units vest description           Standard vesting for profits interests provide for 25% of units to vest after one year with the remaining vesting monthly thereafter over 36 months.  
Weighted average grant date fair value for options granted           $ 0.16 $ 0.22
Stock-based compensation expense   $ 2,536 $ 249 $ 2,966 $ 689 $ 900 $ 700
Unrecognized compensation cost relating to nonvested profits interests           $ 3,600  
Unvested stock expected to be recognized over a weighted-average period           2 years 2 months 12 days  
2020 Stock Option and Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of common stock reserved for issuance 2,930,836 1,305,367   1,305,367      
Stock options, vesting period       4 years      
Stock options, contractual life       10 years      
Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of common units forfeited       666,227      
Unvested stock expected to be recognized over a weighted-average period       1 year 10 months 24 days      
Weighted-average grant-date fair value for profits interests granted       $ 2.34      
Share awards granted 0     879      
Unrecognized compensation cost relating to unvested restricted stock awards   $ 1,800   $ 1,800      
Stock Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted average grant date fair value for options granted       $ 3.42      
Unrecognized compensation cost relating to nonvested profits interests   $ 3,300   $ 3,300      
Unvested stock expected to be recognized over a weighted-average period       2 years 1 month 6 days      
Stock Option | 2020 Stock Option and Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock options, contractual life       9 years 10 months 24 days      
Employee terminations and resignations              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of common units forfeited           10,588,659 1,186,127