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Prepaid Expenses and other assets (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Schedule of Prepaid Expenses and Other Assets | Prepaid expenses and other assets consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2025 |  | December 31, 2024
Research and development | ​ | $ | — | ​ | $ | 1,715
Collaboration receivable (Note 10) | ​ |  | — | ​ |  | 2,864
Other receivables (a) | ​ |  | 579 | ​ |  | —
Deposits | ​ |  | — | ​ |  | 925
Insurance | ​ |  | 1,628 | ​ |  | 340
Other | ​ |  | 78 | ​ |  | 72
​ | ​ | $ | 2,285 | ​ | $ | 5,916
(a) | “Other receivables” primarily consisted of equipment sales, sales and use tax refunds, and research and development tax refunds.
| Prepaid expenses and other assets consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Research and development | ​ | $ | 1,715 | ​ | $ | 278
Collaboration receivable | ​ |  | 2,864 | ​ |  | —
Insurance | ​ |  | 340 | ​ |  | 402
Deposits | ​ |  | 925 | ​ |  | 891
Other | ​ |  | 72 | ​ |  | 1,295
​ | ​ | $ | 5,916 | ​ | $ | 2,866
​

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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References No definition available. + Details
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