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Summary of significant accounting policies (Tables)
 6 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Disaggregation of Revenue
The following table provides disaggregated revenue from contracts with customers by geographical market, as the nature, amount, timing and uncertainty of revenue and cash flows can differ between domestic and international customers (in thousands).
 Three months ended September 30,Six months ended September 30,
Net sales by geographic region:2020201920202019
United States$63,655 $59,731 $121,552 $113,511 
International8,695 7,884 15,325 13,868 
Total net sales$72,350 $67,615 $136,877 $127,379