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Borrowings - Credit facility (Details) - Credit facility - USD ($)
$ in Thousands
Jun. 30, 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