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v3.21.1

Employee benefit plan - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2018
Retirement Benefits [Abstract] |  |  |  |
Defined contribution plan, vest percentage |  | 100.00% |  |
Company contributions to 401 (k) plan | $ 0.1 | $ 0.3 | $ 0.3 | $ 0.2

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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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