Stock option plans - Restricted stock units (Details) - Unvested restricted stock units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unrecognized compensation cost related to RSU	$ 0.2
Recognition period for unrecognized compensation cost	1 year 8 months 12 days
Restricted stock units
Beginning balance (in shares)	12,734	19,985
Granted (in shares)	20,493	24,064	26,150
Vested (in shares)	(5,102)	(30,981)	(5,365)
Cancelled/Forfeited (in shares)	(4,255)	(334)	(800)
Ending balance (in shares)	23,870	12,734	19,985
Weighted average grant date fair value
Beginning balance, Weighted average grant date fair value	$ 21.80	$ 118.20
Granted, Weighted average grant date fair value	8.81	28.68	$ 118.20
Vested, Weighted average grant date fair value	21.80	88.21	118.80
Cancelled/Forfeited, Weighted average grant date fair value	21.80	114.60	120.00
Ending balance, Weighted average grant date fair value	$ 10.00	$ 21.80	$ 118.20
Executive officers
Restricted stock units
Granted (in shares)	17,493	9,320
Executive officers and certain other employees
Restricted stock units
Granted (in shares)		11,330	25,000
Cancelled/Forfeited (in shares)			(800)
Non employee directors
Restricted stock units
Granted (in shares)	3,000	3,414	1,150
Vesting period		1 year
Vesting On One Year Anniversary Of Grant Date \| Executive officers
Restricted stock units
Vesting period	1 year	1 year
Vesting On One Year Anniversary Of Grant Date \| Executive officers and certain other employees
Restricted stock units
Vesting period		1 year
Vesting On One Year Anniversary Of Grant Date \| Non employee directors
Restricted stock units
Vesting period	1 year
Vesting On Two Year Anniversary Of Grant Date \| Executive officers
Restricted stock units
Vesting period	2 years	2 years
Vesting On Two Year Anniversary Of Grant Date \| Executive officers and certain other employees
Restricted stock units
Vesting period		2 years
Vesting On Three Year Anniversary Of Grant Date \| Executive officers
Restricted stock units
Vesting period	3 years	3 years
Vesting On Three Year Anniversary Of Grant Date \| Executive officers and certain other employees
Restricted stock units
Vesting period		3 years

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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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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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