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Borrowings - Amended and Restated Credit Agreement (Details) - Revolving loan facility - USD ($)
Apr. 21, 2021
Mar. 31, 2021
Dec. 31, 2020
Jan. 29, 2019
Borrowings        
Maximum borrowing capacity       $ 20,000,000.0
Interest rate (as a percent)       1.75%
Term of the maturity extension 1 year      
Outstanding amounts   $ 0 $ 0