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Summary of significant accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2024
Accounting Policies [Abstract] |
Reconciliation of cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | End of |  | ​ | Beginning of
​ |  | period- |  | period-
​ |  | June 30, |  | December 31,
​ |  | 2024 | ​ | 2023
Cash and cash equivalents | ​ | $ | 654,779 | ​ | $ | 594,001
Restricted cash included in deposits and other assets | ​ |  | 13,763 | ​ |  | 16,283
Total Cash, cash equivalents and restricted cash per statement of cash flows | ​ | $ | 668,542 | ​ | $ | 610,284
Schedule of Inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2024 |  | December 31, 2023
Raw materials | ​ | $ | 1,113 | ​ | $ | 952
Work in progress | ​ |  | 24,033 | ​ |  | 17,991
Finished goods | ​ |  | 6,680 | ​ |  | 11,634
Total inventory | ​ | $ | 31,826 | ​ | $ | 30,577

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