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Borrowings - Amended and Restated Credit Agreement (Details) - USD ($)
6 Months Ended
Jan. 29, 2019
Jun. 30, 2020
Dec. 31, 2019
Revolving loan facility      
Borrowings      
Maximum borrowing capacity $ 20,000,000.0    
Outstanding amounts   $ 20,000,000.0 $ 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%