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Significant Accounting Policies (Details)
€ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2023
EUR (€)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]                  
General and administrative expense   $ 4,006,000 $ 8,546,000 $ 8,360,000 $ 13,298,000 $ 33,281,000 $ 18,757,000    
Research and development   690,000 971,000 $ 1,615,000 1,384,000 $ 6,245,000 9,632,000    
Reportable segment       1   1      
Impairment       $ 0 0    
Deferred transaction costs   139,000   139,000   16,234,000    
Impairment charges   0   0        
Contract asset   0   0   0      
Deferred revenue   100,000   100,000   0      
Sales and marketing expense   183,000 62,000 303,000 123,000 1,989,000 866,000    
Minimum purchase commitments                
Termination fee (in Euro) | € € 0.3             € 0.3  
Commercial sales and total revenue   1,302,000 56,000 1,473,000 75,000 1,373,000 3,441,000    
Accounts receivable           900,000 0    
Inventory balance   346,000   346,000   1,760,000 235,000    
Contract assets           0 0    
Stock-based compensation expense   $ 1,563,000 $ 97,000 $ 3,694,000 $ 195,000 $ 18,164,000 643,000    
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Discontinued Production Of Mylo [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges             10,200,000    
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Research And Development Operations In California [Member]                  
Significant Accounting Policies [Line Items]                  
Impairment charges             $ 9,100,000    
Customer Concentration Risk [Member] | Customer One [Member] | Revenue Benchmark [Member]                  
Significant Accounting Policies [Line Items]                  
Total revenue   95.00% 98.00% 94.00% 72.00% 88.00% 99.00% 99.00%  
Restricted Stock Units (RSUs) [Member]                  
Significant Accounting Policies [Line Items]                  
Stock-based compensation expense   $ 1,400,000   $ 3,300,000   $ 17,000,000 $ 0    
Non-US | Geographic Concentration Risk | Net Assets, Geographic Area                  
Significant Accounting Policies [Line Items]                  
Total revenue       1.00%   1.00%      
Correction of Error [Member]                  
Significant Accounting Policies [Line Items]                  
General and administrative expense         $ 1,100,000   2,600,000    
Research and development         $ (1,100,000)   2,000,000    
Sales and marketing expense             $ 600,000