Post-effective amendment to a registration statement that is not immediately effective upon filing

Significant accounting estimates, assumptions and judgments - Additional Information (Detail)

v3.22.2.2
Significant accounting estimates, assumptions and judgments - Additional Information (Detail)
€ / shares in Units, € in Thousands
1 Months Ended 6 Months Ended 12 Months Ended 20 Months Ended
Jul. 28, 2021
EUR (€)
Dec. 31, 2019
EUR (€)
Jun. 30, 2022
EUR (€)
€ / shares
shares
Jun. 30, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2020
EUR (€)
€ / shares
shares
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
EUR (€)
Jul. 27, 2022
Jun. 30, 2022
$ / shares
Jun. 07, 2022
Apr. 22, 2021
Mar. 26, 2021
Dec. 31, 2018
EUR (€)
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Cash and cash equivalents   € 21,277 € 29,775 € 6,010 € 24,652 € 8,274 € 21,277 € 21,277           € 1,211
Number of shares issued | shares       100 100 100                
Par value per share | € / shares       € 1 € 1 € 1                
Share capital     32,061   € 1 € 1                
Percentage of voting equity interests acquired         100.00%               100.00%  
Deferred tax assets   4,837     € 8,209 4,573 4,837 4,837            
Impairments of property, plant and equipment     545 € 0 354 466 272              
Reversal of impairments loss     122 € 0 € 381 0 0              
Spartan Merger [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Cash and cash equivalents     € 136,000                      
Number of days warrants being exercisable after the closing date of the BCA     30 days                      
MOMA company [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of voting equity interests acquired                         8.50%  
MOMA company [Member] | Major business combination [member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of voting equity interests acquired                     100.00%      
Third Party Company [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of voting equity interests acquired                         42.00%  
Ordinary shares [member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Par value per share | € / shares     € 0.12   € 1                  
Share capital     € 28,312   € 100 100                
Ordinary shares [member] | Spartan Merger [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Number of shares issued | shares     15,000,000                      
Par value per share | $ / shares                   $ 0.12        
Chargers [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of up time an equipment being functional without technical issues         95.00%                  
Impairments of property, plant and equipment         € 354 466 272              
Reversal of impairments loss         381 0 0              
DE And BE [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Deferred tax assets         570                  
GERMANY                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Deferred tax assets           722                
Consultancy Firm [Member] | Madeline [Member] | Amendment To Special Fees Agreement [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Amended agreement provides right to subscribe additional shares percentage of share capital as A consideration for services after completion of listing                       5.00%    
Mega E [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Consideration paid (received) € 0 0                        
Share capital € 9,456 € 100         € 100 € 100            
Percentage of voting equity interests acquired 100.00%                          
Percentage of shares and voting rights held 100.00%             100.00%            
Mega E [Member] | Major business combination [member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of voting equity interests acquired                 51.00%          
Mega E [Member] | Call Option Agreement [Member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Percentage of voting equity interests acquired 100.00%                          
Computer software [member]                            
Disclosure Of Significant Accounting Estimates Assumptions And Judgements [Line Items]                            
Carrying value of capitalized development costs         € 4,198 € 3,812                
Useful life measured as period of time, intangible assets other than goodwill         3 years                  
Description of useful life intangible assets other than goodwill         actual useful life may be shorter or longer than three years, depending on innovations, market developments and competitor actions.