Stock compensation plans - Restricted Stock Units (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value	$ 7,915	$ 13,057
Number of Shares
Unvested RSUs at beginning of period	1,295,554
Granted	2,051,801
Vested	(315,279)
Canceled	(619,581)
Unvested RSUs at end of period	2,412,495	1,295,554
Weighted-Average Grant Date Fair Value Per Share
Unvested RSUs at beginning of period	$ 9.72
Granted	3.86
Vested	10.29
Canceled	7.62
Unvested RSUs at end of period	$ 5.20	$ 9.72
Weighted-Average Remaining Contractual Term (in years)	1 year 5 months 1 day	1 year 8 months 8 days
Aggregate Intrinsic Value	$ 5,525	$ 6,322
Fair value of vested RSUs	$ 1,483	$ 950

Fair value of granted awards under share-based payment arrangement. Excludes share and unit options.

No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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