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Investment in equity securities - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | 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

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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Details
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