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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
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,
 20232022
United States$(12,859)$(47,049)
Germany(76,970)(67,448)
Foreign(3,783)(5,911)
$(93,612)$(120,408)
Schedule of Income Tax Rate Reconciliation
The rate reconciliation consists of the following:
 Years Ended December 31,
 20232022
Federal statutory rate21.0 %21.0 %
Foreign rate differential3.1 %2.2 %
Stock options(1.2)%(1.1)%
Tax effect of rate change0.0 %0.0 %
Goodwill impairment0.0 %(5.7)%
Other1.2 %(0.7)%
Change in valuation allowance(24.1)%(15.7)%
Effective tax rate0.0 %0.0 %
Schedule of Deferred Tax Assets and Liabilities
 December 31,
 20232022
 (in thousands)
Deferred tax assets:
Net operating loss carryforwards$20,768 $19,830 
Stock-based compensation1,344 742 
Intangible Assets2,743 2,923 
Foreign net operating loss carryforwards71,398 47,179 
Unrealized gain or loss1,784 1,686 
Other, net1,014 693 
     Total deferred tax assets99,051 73,053 
Deferred tax liabilities:
     Total deferred tax liability — — 
Net deferred tax assets99,051 73,053 
Less valuation allowance(99,051)(73,053)
$— $—