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Borrowings - Amended and Restated Credit Agreement (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Jan. 29, 2019
Revolving loan facility      
Borrowings      
Maximum borrowing capacity     $ 20,000,000.0
Outstanding amounts $ 20,000,000.0 $ 0  
Interest rate (as a percent) 1.75%    
Term Loan      
Borrowings      
Maximum borrowing capacity     $ 60,000,000.0
Interest rate (as a percent)     1.50%