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Borrowings - Credit facility (Details) - Credit facility - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 01, 2021
Jul. 25, 2019
Disclosure of detailed information about borrowings [line items]      
Borrowing commitment     $ 15,000
Borrowings   $ 0  
Unamortized financing costs      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 64