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Commitments and contingencies - Components of leases and lease costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating leases
Operating lease right-of-use assets	$ 1,458	$ 2,012
Operating lease liabilities, current portion	733	731
Operating lease liabilities, non-current portion	711	1,309
Total operating lease liabilities	1,444	2,040
Operating lease costs
Operating lease costs	$ 1,027	$ 906

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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
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-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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-Topic 842
-SubTopic 20
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-Section 45
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Amount of lessee's right to use underlying asset under operating lease.

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-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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