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Segment reporting and concentrations - Additional information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) customer segment | Mar. 31, 2023 customer | Dec. 31, 2023 USD ($) client
Segment reporting and concentrations |  |  |
Number of reporting segments | segment | 3 |  |
Right-of-use-asset, net | $ | $ 4,815 |  | $ 5,054
Sales revenue, net | Customer concentration risk | Non-US |  |  |
Segment reporting and concentrations |  |  |
Concentration risk, percentage | 33.00% | 39.00% |
Foreign customer | Accounts receivable | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Concentration risk, percentage | 27.00% |  | 31.00%
One customer | Sales revenue, net | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Number of clients | 1 |  |
Concentration risk, percentage | 24.00% |  |
Two customer | Sales revenue, net | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Number of clients |  | 2 |
Concentration risk, percentage |  | 11.00% |
Three customer | Accounts receivable | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Number of clients | 2 |  |
Concentration risk, percentage | 35.00% |  |
Four customer | Accounts receivable | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Number of clients | client |  |  | 3
Concentration risk, percentage |  |  | 53.00%
Customer | Customer concentration risk | United States |  |  |
Segment reporting and concentrations |  |  |
Number of clients | 0 |  |
Customer | Accounts receivable | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Number of clients | 0 |  |
Customer | Minimum | Sales revenue, net | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Concentration risk, percentage | 10.00% |  |
Customer | Minimum | Accounts receivable | Customer concentration risk |  |  |
Segment reporting and concentrations |  |  |
Concentration risk, percentage |  |  | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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