Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.21.1
Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]    
Increase in the valuation allowance $ (9,800,000)  
Uncertain tax positions interest and penalties accrued 0 $ 0
Federal    
Income Taxes [Line Items]    
Net operating loss carryforwards 27,300,000  
State    
Income Taxes [Line Items]    
Net operating loss carryforwards 33,200,000  
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 116,600,000  
Germany | Trade tax carryforwards    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 115,100,000