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Fair value of financial instruments - Summary of Fair Value of Financial Liabilities (Details) - Fair Value Measurements, Recurring Basis - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Financial liabilities:    
Long-term debt, including current portion $ 126,789 $ 138,865
Total financial liabilities 126,789 138,865
Current portion of long-term debt 16,281 12,568
Level 1    
Financial liabilities:    
Long-term debt, including current portion 0 0
Total financial liabilities 0 0
Level 2    
Financial liabilities:    
Long-term debt, including current portion 126,789 138,865
Total financial liabilities 126,789 138,865
Level 3    
Financial liabilities:    
Long-term debt, including current portion 0 0
Total financial liabilities $ 0 $ 0