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Summary of significant accounting policies - Prior Period Adjustments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement |  |  |
Allowance for credit losses | $ 21,895 |  |
Overstatement of allowance for credit losses |  |  |
Error Corrections and Prior Period Adjustments Restatement |  |  |
Allowance for credit losses |  |  | $ 1,500
Overstatement of allowance for credit losses | Adoption of ASU 2016-13 |  |  |
Error Corrections and Prior Period Adjustments Restatement |  |  |
Allowance for credit losses | $ 1,100 | $ 1,100 | $ 400

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