Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies
Allowance for doubtful accounts on grants receivable	$ 0		$ 0
Grant income	1,215	$ 4,293	13,407	$ 16,516
Deferred grant income, current	1,736		$ 1,736		$ 1,066
Expected dividend yield			0.00%	0.00%
Number of operating segments \| segment			1
Unrecognized income tax	0		$ 0		0
Cash, Cash Equivalents, and Restricted Cash Equivalents
Cash and cash equivalents	39,334	22,011	39,334	$ 22,011	25,009
Restricted cash equivalents	489		489
Total	$ 39,823	$ 22,011	$ 39,823	$ 22,011	$ 25,009	$ 29,922

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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