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Income Taxes (Tables)
 12 Months Ended
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,
 20242023
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,
 20242023
Federal statutory rate21.0 %21.0 %
Foreign rate differential2.8 %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 rate0.0 %0.0 %
Schedule of Deferred Tax Assets and Liabilities
 December 31,
 20242023
 (in thousands)
Deferred tax assets:
Net operating loss carryforwards$22,192 $20,768 
Stock-based compensation2,198 1,344 
Intangible assets2,630 2,743 
Foreign net operating loss carryforwards90,020 71,398 
Unrealized gain or loss— 1,784 
Other, net38 1,014 
     Total deferred tax assets117,078 99,051 
Deferred tax liabilities:
     Total deferred tax liability — — 
Net deferred tax assets117,078 99,051 
Less valuation allowance(117,078)(99,051)
$— $—