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Commitments and contingencies - Letters of Credit (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Itaú  
Line of Credit Facility [Line Items]  
Letters of credit $ 15
Required Maximum Ratio 1.00
Itaú | Maximum  
Line of Credit Facility [Line Items]  
Required Maximum Ratio 4.5
Credit Suisse  
Line of Credit Facility [Line Items]  
Letters of credit $ 45
Required Maximum Ratio 0.67
Credit Suisse | Maximum  
Line of Credit Facility [Line Items]  
Required Maximum Ratio 4
JPMorgan  
Line of Credit Facility [Line Items]  
Letters of credit $ 20
Required Maximum Ratio 0.67
JPMorgan | Maximum  
Line of Credit Facility [Line Items]  
Required Maximum Ratio 4.5