Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies
Allowance for doubtful accounts on grants receivable	$ 0		$ 0
Grant income	7,106	$ 7,311	12,192	$ 12,223
Deferred grant income, current	1,982		$ 1,982		$ 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	10,743	28,533	10,743	$ 28,533	25,009
Restricted cash equivalents	814		814
Total	$ 11,557	$ 28,533	$ 11,557	$ 28,533	$ 25,009	$ 29,922

Amount of allowance for credit loss on grants receivable, classified as current.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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