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Summary of Significant Accounting Policies - Exchange rates (Details) | 6 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Euro to US Dollar |  |  |  |
Period end exchange rate | 1.10 | 1.07 | 1.09 | 1.05
Average period exchange rate | 1.08 | 1.01 | 1.05 | 1.13
GBP To US Dollar |  |  |  |
Period end exchange rate | 1.27 | 1.21 | 1.27 | 1.21
Average period exchange rate | 1.25 | 1.17 | 1.20 | 1.34
Mexican Peso to US Dollar |  |  |  |
Period end exchange rate | 0.06 | 0.05 | 0.06 | 0.05
Average period exchange rate | 0.06 | 0.05 | 0.05 | 0.05

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