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Debt - Term Loan Facility (Details) - USD ($)
3 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Long-term debt      
Repayment of long-term debt   $ 0 $ 2,000,000
Term loan facility      
Long-term debt      
Maximum borrowing capacity   300,000,000  
Amount borrowed   300,000,000  
Amount available for use   $ 0  
Term loan facility | Subsequent event      
Long-term debt      
Repayment of long-term debt $ 750,000    
Term loan facility | LIBOR rate      
Long-term debt      
Contractual spread   2.25%