v3.26.3
EVENTS AFTER THE REPORTING PERIOD (Details)
$ / shares in Units, € in Thousands, $ in Millions
6 Months Ended 12 Months Ended
May 12, 2026
USD ($)
Apr. 24, 2026
EUR (€)
D
Mar. 05, 2026
USD ($)
Jan. 21, 2026
USD ($)
Jan. 18, 2026
USD ($)
item
$ / shares
shares
Jan. 16, 2026
shares
Jun. 30, 2026
EUR (€)
Jun. 30, 2025
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Apr. 24, 2026
USD ($)
Mar. 31, 2026
EUR (€)
Jan. 31, 2026
USD ($)
Dec. 31, 2025
$ / shares
shares
EVENTS AFTER THE REPORTING PERIOD                            
Proceeds from loans | €             € 1,306 € 1,222 € 7,572 € 3,145        
Number of shares outstanding                           43,062,427
XJ Harbour Set-off agreement                            
EVENTS AFTER THE REPORTING PERIOD                            
Conversion share price | $ / shares                           $ 2.15
Going concern measures | 7.00% Senior Convertible Note due 2028                            
EVENTS AFTER THE REPORTING PERIOD                            
Commitment value | $         $ 30.0                  
Interest rate on borrowings         7.00%                  
Debt arrangements | 7.00% Senior Convertible Note due 2028                            
EVENTS AFTER THE REPORTING PERIOD                            
Commitment value | $         $ 30.0               $ 30.0  
Percentage of principal at which the senior convertible notes were issued         98.00%                  
Proceeds from loans | $     $ 15.0 $ 15.0                    
Term of borrowings         two                  
Interest rate on borrowings         7.00%                  
Number of conversion notices issued | item         6                  
Debt converted | $         $ 12.0                  
Number of shares issued         2,197,898                  
Debt arrangements | Black forest term loan facility, second tranche | Top of range [member]                            
EVENTS AFTER THE REPORTING PERIOD                            
Commitment value | €                       € 7,500    
Debt arrangements | XJ Harbour HK Limited                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of shares issued           12,540,539                
Debt arrangements | XJ Harbour HK Limited | XJ Harbour Set-off agreement                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of shares issued           12,540,539                
Major ordinary share transactions                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of shares outstanding         57,800,864                  
Major ordinary share transactions | Anette Schmid and Christian Schmid                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of nonvoting earnout shares held         5,000,000                  
Major ordinary share transactions | Threshold share price of 15.00 for cancellation of nonvoting earnout shares                            
EVENTS AFTER THE REPORTING PERIOD                            
Threshold share price | $ / shares         $ 15                  
Major ordinary share transactions | Threshold share price of 15.00 for cancellation of nonvoting earnout shares | Anette Schmid and Christian Schmid                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of nonvoting earnout shares held         2,500,000                  
Major ordinary share transactions | Threshold share price of 18.00 for cancellation of nonvoting earnout shares                            
EVENTS AFTER THE REPORTING PERIOD                            
Threshold share price | $ / shares         $ 18                  
Major ordinary share transactions | Threshold share price of 18.00 for cancellation of nonvoting earnout shares | Anette Schmid and Christian Schmid                            
EVENTS AFTER THE REPORTING PERIOD                            
Number of nonvoting earnout shares held         2,500,000                  
Set-off of financial liabilities through share issuances                            
EVENTS AFTER THE REPORTING PERIOD                            
Financial liabilities to be settled through issuance of shares | €   € 30,800                        
Number of specified trading days | D   5                        
Set-off of financial liabilities through share issuances | Christian Schmid                            
EVENTS AFTER THE REPORTING PERIOD                            
Financial liabilities to be settled through issuance of shares | $                     $ 2.4      
Percentage of discount rate   20.00%                        
Potential ordinary share transactions                            
EVENTS AFTER THE REPORTING PERIOD                            
Standby equity purchase agreement, maximum financing amount | $ $ 30.0                          
Standby equity purchase agreement, availability period 24 months                          
Commitment fee 0.50%                          
Purchase price option one 97.00%                          
Purchase price option two 99.00%