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Fair value measurement - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | $ 39,158,209 | $ 127,610,943
Contingent consideration1 | 1,225,000 | 1,888,000
Total fair value | 40,383,209 | 129,498,943
Contingent earnout liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 28,213,229 | 115,566,762
Derivative stock option liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 275,150 | 414,260
Warrant | Private placement warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 2,907,330 | 3,292,996
Warrant | Public warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 7,762,500 | 8,336,925
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 7,762,500 | 8,336,925
Contingent consideration1 | 0 | 0
Total fair value | 7,762,500 | 8,336,925
Level 1 | Contingent earnout liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 1 | Derivative stock option liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 1 | Warrant | Private placement warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 1 | Warrant | Public warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 7,762,500 | 8,336,925
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Contingent consideration1 | 0 | 0
Total fair value | 0 | 0
Level 2 | Contingent earnout liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 2 | Derivative stock option liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 2 | Warrant | Private placement warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 2 | Warrant | Public warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 31,395,709 | 119,274,018
Contingent consideration1 | 1,225,000 | 1,888,000
Total fair value | 32,620,709 | 121,162,018
Level 3 | Contingent earnout liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 28,213,229 | 115,566,762
Level 3 | Derivative stock option liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 275,150 | 414,260
Level 3 | Warrant | Private placement warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | 2,907,330 | 3,292,996
Level 3 | Warrant | Public warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liability | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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