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Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 12, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
May 23, 2016
Line of Credit Facility              
Line of credit maximum borrowing amount   $ 300,000,000   $ 300,000,000   $ 300,000,000  
Outstanding borrowings   106,300,000   106,300,000   99,700,000  
Debt amortization expense   42,000 $ 42,000 126,000 $ 121,000    
Line of Credit | Revolving Credit Facility Due 2024              
Line of Credit Facility              
Debt instrument, term 5 years            
Line of credit maximum borrowing amount $ 300,000,000           $ 300,000,000
Line of credit facility contingent increase to maximum borrowing capacity 150,000,000            
Outstanding borrowings $ 50,000,000 $ 106,300,000   $ 106,300,000   $ 99,700,000  
Commitment fee percentage per annum       0.25%   0.23%  
Line of Credit | Revolving Credit Facility Due 2024 | Minimum              
Line of Credit Facility              
Commitment fee percentage per annum 0.20%            
Line of Credit | Revolving Credit Facility Due 2024 | Maximum              
Line of Credit Facility              
Commitment fee percentage per annum 0.30%            
Line of Credit | Revolving Credit Facility Due 2024 Swingline Sublimit              
Line of Credit Facility              
Line of credit maximum borrowing amount $ 15,000,000            
Line of Credit | Revolving Credit Facility Due 2024 Letter Of Credit Sublimit              
Line of Credit Facility              
Line of credit maximum borrowing amount $ 10,000,000