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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Schedule of Net Loss Before Income Tax Based on Jurisdictions | Net loss before income tax was subject to tax in the following jurisdictions for the following periods (in thousands):
| Years Ended December 31,
| 2024 |  | 2023 |
United States | $ | (21,382) |  |  | $ | (12,859) |  |
Germany | (78,914) |  |  | (76,970) |  |
Foreign | (211) |  |  | (3,783) |  |
| $ | (100,507) |  |  | $ | (93,612) |  |
Schedule of Income Tax Rate Reconciliation | The rate reconciliation consists of the following:
| Years Ended December 31,
| 2024 |  | 2023
Federal statutory rate | 21.0 | % |  | 21.0 | %
Foreign rate differential | 2.8 | % |  | 3.1 | %
Stock options | (1.4) | % |  | (1.2) | %
Deferred tax true-up | (2.5) | % |  | 0.0 | %
Stock and warrant issuance cost | (1.4) | % |  | 0.0 | %
Other | (0.9) | % |  | 1.2 | %
Change in valuation allowance | (17.6) | % |  | (24.1) | %
Effective tax rate | 0.0 | % |  | 0.0 | %
Schedule of Deferred Tax Assets and Liabilities |
| December 31,
| 2024 |  | 2023
| (in thousands)
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 22,192 |  |  | $ | 20,768 |
Stock-based compensation | 2,198 |  |  | 1,344 |
Intangible assets | 2,630 |  |  | 2,743 |
Foreign net operating loss carryforwards | 90,020 |  |  | 71,398 |
Unrealized gain or loss | — |  |  | 1,784 |
Other, net | 38 |  |  | 1,014 |
Total deferred tax assets | 117,078 |  |  | 99,051 |
Deferred tax liabilities: |  |  |
Total deferred tax liability | — |  |  | — |
Net deferred tax assets | 117,078 |  |  | 99,051 |
Less valuation allowance | (117,078) |  |  | (99,051) |
| $ | — |  |  | $ | — |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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