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Commitments and contingencies (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Commitments and contingencies  
Estimated litigation liability $ 5,900,000
Interest rate description litigation plus legal interest that accrued at 12% per annum from August 13, 2008 to June 30, 2013, and thereafter accrued and continues to accrue at 6% per annum
Litigation settlement expense $ 450,000