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Prepaid Expenses and Other Assets (Tables)

6 Months Ended

12 Months Ended

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.

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