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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.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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No definition available.

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