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Stock-Based Compensation - Summary of Company's Stock Option Plan Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward                    
Outstanding, Beginning Balance, Number of Options 440,000 440,000 340,000 340,000 350,000 240,000 340,000 240,000 240,000  
Granted, Number of options     110,000     110,000        
Exercised, Number of Options     (10,000)   (10,000)   (10,000) (10,000)    
Outstanding, Ending Balance, Number of Options 440,000 440,000 440,000 340,000 340,000 350,000 440,000 340,000 340,000 240,000
Exercisable, Number of Options 165,000     92,500     165,000 92,500    
Outstanding, Beginning Balance, Weighted Average Exercise Price $ 45.25 $ 45.25 $ 43.21 $ 43.21 $ 42.16 $ 37.19 $ 43.21 $ 37.19 $ 37.19  
Granted, Weighted Average Exercise Price     48.00     53.00        
Exercised, Weighted Average Exercise Price     6.30   6.30          
Outstanding, Ending Balance, Weighted Average Exercise Price 45.25 $ 45.25 $ 45.25 43.21 $ 43.21 $ 42.16 45.25 43.21 $ 43.21 $ 37.19
Exercisable, Weighted-Average Exercise Price $ 42.17     $ 36.36     $ 42.17 $ 36.36    
Outstanding, Weighted-Average Remaining Contractual Term 7 years 9 months 18 days 8 years 1 month 6 days 8 years 3 months 18 days 8 years 1 month 6 days 8 years 4 months 24 days 8 years 6 months     7 years 10 months 24 days 8 years 9 months 18 days
Exercisable, Weighted-Average Remaining Contractual Term             7 years 7 years    
Outstanding, Aggregate Intrinsic Value $ 2,321 $ 1,184   $ 1,057 $ 445 $ 1,329 $ 2,321 $ 1,057 $ 1,657 $ 3,278
Exercisable, Aggregate Intrinsic Value $ 1,334     $ 627     $ 1,334 $ 627