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Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total € 26,430 € 33,035 € 47,370
Germany [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 19,538 23,809 46,979
Switzerland [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 1,628 1,186 222
Ireland [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 1,223 1,944  
Spain [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 1,071 3,371 17
Netherlands [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 872 491  
Austria [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total   750 4
United States of America [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total 731   29
Other European Countries [Member]      
Disclosure on individual items of the consolidated financial statements (Details) - Schedule of current taxes and deferred taxes [Line Items]      
Revenue by region total € 1,367 € 1,482 € 118