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Summary of significant accounting policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total net sales $ 91,855 $ 72,350 $ 188,902 $ 136,877
United States        
Disaggregation of Revenue [Line Items]        
Total net sales 81,831 63,655 168,463 121,552
International        
Disaggregation of Revenue [Line Items]        
Total net sales $ 10,024 $ 8,695 $ 20,439 $ 15,325