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Investment in equity securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Apr. 14, 2017
Debt and Equity Securities, FV-NI [Line Items]          
Impairment charges on investment $ 0 $ 0 $ 0 $ 0  
Social Media Analytics Company          
Debt and Equity Securities, FV-NI [Line Items]          
Amount invested in minority equity investment         $ 2,900,000