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Stock-Based Compensation - Summary of SVO and PSO Activity under the 2015 Plan (Detail) - 2015 Long-Term Equity Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Service-Based Vesting Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Number of Shares 6,289,248 5,374,486 5,374,486  
Granted, Number of Shares 316,272 723,615    
Forfeited / Cancelled, Number of Shares (148,552) (303,650)    
Exercised, Number of Shares (5,990) (143,760)    
Ending Balance, Number of Shares 6,450,978 5,650,691 6,289,248 5,374,486
Beginning Balance, Weighted Average Exercise Price $ 9.60 $ 9.97 $ 9.97  
Granted, Weighted Average Exercise Price 9.68 10.73    
Forfeited / Cancelled, Weighted Average Exercise Price 9.63 9.99    
Exercised, Weighted Average Exercise Price 9.39 8.35    
Ending Balance, Weighted Average Exercise Price $ 9.58 $ 10.10 $ 9.60 $ 9.97
Weighted Average Remaining Contractual Life (years) 6 years 11 months 19 days 7 years 6 months 18 days 7 years 6 months 29 days 7 years 9 months 29 days
Beginning Balance, Aggregate Intrinsic Value $ 843 $ 4,700 $ 4,700  
Exercised, Aggregate Intrinsic Value 141 356    
Ending Balance, Aggregate Intrinsic Value $ 105,668 $ 845 $ 843 $ 4,700
Performance-Based Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Number of Shares 3,120,790 3,036,930 3,036,930  
Granted, Number of Shares   143,760    
Forfeited / Cancelled, Number of Shares (23,960) (59,900)    
Ending Balance, Number of Shares 3,096,830 3,120,790 3,120,790 3,036,930
Beginning Balance, Weighted Average Exercise Price $ 10.05 $ 10.38 $ 10.38  
Forfeited / Cancelled, Weighted Average Exercise Price 9.68      
Ending Balance, Weighted Average Exercise Price $ 10.05 $ 10.39 $ 10.05 $ 10.38
Weighted Average Remaining Contractual Life (years) 7 years 3 months 21 days 8 years 3 months 18 days 8 years 18 days 9 years 7 days
Beginning Balance, Aggregate Intrinsic Value   $ 1,351 $ 1,351  
Ending Balance, Aggregate Intrinsic Value $ 31,122   $ 1,351