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Borrowings - Amended and Restated Credit Agreement (Details) - USD ($)
Apr. 24, 2020
Jan. 29, 2019
Sep. 30, 2020
Dec. 31, 2019
Revolving loan facility        
Borrowings        
Maximum borrowing capacity   $ 20,000,000.0    
Outstanding amounts     $ 0 $ 0
Floating interest rate margin (as a percent) 1.75%      
Term of the maturity extension 1 year      
Term Loan        
Borrowings        
Maximum borrowing capacity   $ 60,000,000.0    
Floating interest rate margin (as a percent)   1.50%