Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]    
Increase in the valuation allowance $ 9,500,000  
Uncertain tax positions interest and penalties accrued 0 $ 0
Federal    
Income Taxes [Line Items]    
Net operating loss carryforwards 33,100,000  
State    
Income Taxes [Line Items]    
Net operating loss carryforwards 37,400,000  
Germany    
Income Taxes [Line Items]    
Net operating loss carryforwards 1,200,000  
Germany | Corporate income tax carryforwards    
Income Taxes [Line Items]    
Net operating loss carryforwards 154,800,000  
Germany | Trade tax carryforwards    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 153,900,000