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Commitments and contingencies - Components of leases and lease costs (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Operating leases |  |  |  |
Operating lease right-of-use assets | $ 1,273 |  | $ 1,458 | [1]
Operating lease liabilities, current portion | 755 |  | 733 | [1]
Operating lease liabilities, non-current portion | 512 |  | 711 | [1]
Total operating lease liabilities | 1,267 |  | $ 1,444 |
Operating lease costs |  |  |  |
Operating lease costs | $ 300 | $ 200 |  |
[1] | The condensed balance sheet as of December 31, 2023 was derived from the audited balance sheet as of that date.

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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