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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
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,
 20222021
United States$(47,049)$(11,222)
Germany(67,448)(78,869)
Foreign(5,911)(2,854)
$(120,408)$(92,945)
Income Tax Rate Reconciliation The rate reconciliation consists of the following:
 Years Ended December 31,
 20222021
Federal statutory rate21.0 %21.0 %
Foreign rate differential2.2 %3.2 %
Stock options(1.1)%(0.9)%
Tax effect of rate change0.0 %0.0 %
Goodwill impairment(5.7)%0.0 %
Other(0.7)%(0.4)%
Change in valuation allowance(15.7)%(22.9)%
Effective tax rate0.0 %0.0 %
Deferred Tax Assets and Liabilities
 December 31,
 20222021
 (in thousands)
Deferred tax assets:
Net operating loss carryforwards$19,830 $18,437 
Stock-based compensation742 576 
Intangible Assets2,923 3,848 
Foreign net operating loss carryforwards47,179 34,819 
Unrealized gain or loss1,686 1,130 
Other, net693 9 
     Total deferred tax assets73,053 58,819 
Deferred tax liabilities:
Property, plant and equipment— (2)
     Total deferred tax liability — (2)
Net deferred tax assets73,053 58,817 
Less valuation allowance(73,053)(58,817)
$— $—