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Income taxes - Valuation allowance for deferred tax assets (Details) | 12 Months Ended
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Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Deferred tax assets, Valuation allowance |  |
Valuation allowance as of beginning of year | $ 17,329,000 | $ 9,396,000
Increases recorded to income tax provision | 22,624,000 | 8,047,000
Increases recorded to income tax provision for equity | 76,000 |
Decrease recorded to income tax provision for equity |  | (114,000)
Valuation allowance as of end of year | 40,028,000 | 17,329,000
Accrued interest or penalties related to uncertain tax positions | 0 | 0
Income tax benefit | $ 0 | $ 0
Number of pending tax examination | 0 |

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- Definition Amount of decrease in the valuation allowance due to income tax provision for equity for a specified deferred tax asset. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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