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Equity-Based Compensation - Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options outstanding, Beginning balance | shares 1,360,068 1,199,540  
Options granted | shares 488,000 605,200  
Options exercised | shares (12,400) (55,671)  
Options cancelled | shares (228,537) (389,001)  
Options outstanding, Ending balance | shares 1,607,131 1,360,068 1,199,540
Options exercisable, Ending balance | shares 660,031 513,290  
Options outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 39.40 $ 44.64  
Options granted, Weighted Average Exercise Price | $ / shares 33.12 28.50  
Options exercised, Weighted Average Exercise Price | $ / shares 28.25 19.05  
Options cancelled, Weighted Average Exercise Price | $ / shares 40.46 40.84  
Options outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 37.42 39.40 $ 44.64
Options exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 44.19 $ 48.08  
Options outstanding, Weighted Average Remaining Contractual Term 7 years 8 months 23 days 7 years 6 months 25 days 7 years 3 months 3 days
Options granted, Weighted Average Remaining Contractual Term 9 years 5 months 12 days 9 years 2 months 15 days  
Options exercisable, Weighted Average Remaining Contractual Term, Ending balance 5 years 10 months 6 days 5 years 10 months 17 days  
Options outstanding, Aggregate Intrinsic Value | $ $ 407 $ 1,650 $ 2,717
Options granted, Aggregate Intrinsic Value | $ 29 1,343  
Options exercised, Aggregate Intrinsic Value | $ 34 658  
Options exercisable, Aggregate Intrinsic Value, Ending balance | $ $ 382 $ 512