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Debt Financing (Details) - 6 months ended Jun. 30, 2023
€ in Thousands
EUR (€)
$ / shares
Total short term principal amounts € 38,630  
Accrued interest 35,523  
Total loans and notes € 74,153  
Note 2 [Member]    
Issuance date 10/21/2007  
Principal amount € 500  
Interest rate 10.00%  
Conversion price | $ / shares   $ 0.50
Fixed rate conversion 1.4090  
Note 3 [Member]    
Issuance date 12/10/2007  
Principal amount € 1,500  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.4429  
Note 4 [Member]    
Issuance date 01/22/2008  
Principal amount € 1,500  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.4629  
Note 5 [Member]    
Issuance date 04/25/2008  
Principal amount € 2,000  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.5889  
Note 6 [Member]    
Issuance date 06/30/2008  
Principal amount € 1,500  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.5380  
Note 7 [Member]    
Issuance date 11/18/2008  
Principal amount € 1,200  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.2650  
Note 8 [Member]    
Issuance date 02/09/2009  
Principal amount € 1,500  
Interest rate 10.00%  
Conversion price | $ / shares   0.50
Fixed rate conversion 1.2940  
Note 9 [Member]    
Issuance date 06/15/2009  
Principal amount € 5,500  
Interest rate 10.00%  
Conversion price | $ / shares   0.80
Fixed rate conversion 1.4045  
Note 10 [Member]    
Issuance date 06/15/2009  
Principal amount € 100  
Interest rate 10.00%  
Conversion price | $ / shares   0.80
Fixed rate conversion 1.4300  
Note 11 [Member]    
Issuance date 08/03/2009  
Principal amount € 200  
Interest rate 10.00%  
Conversion price | $ / shares   0.80
Fixed rate conversion 1.4400  
Note 12 [Member]    
Issuance date 10/13/2009  
Principal amount € 2,000  
Interest rate 5.00%  
Conversion price | $ / shares   0.25
Fixed rate conversion 1.4854  
Note 13 [Member]    
Issuance date 12/18/2009  
Principal amount € 2,200  
Interest rate 5.00%  
Conversion price | $ / shares   0.25
Fixed rate conversion 1.4338  
Note 14 [Member]    
Issuance date 08/04/2011  
Principal amount € 1,102  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Note 15 [Member]    
Issuance date 08/04/2011  
Principal amount € 276  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Note 16 [Member]    
Issuance date 11/08/2011  
Principal amount € 400  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3787  
Note 17 [Member]    
Issuance date 11/08/2011  
Principal amount € 100  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3787  
Note 18 [Member]    
Issuance date 02/10/2012  
Principal amount € 1,000  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3260  
Note 19 [Member]    
Issuance date 02/14/2012  
Principal amount € 200  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3260  
Note 20 [Member]    
Issuance date 04/19/2012  
Principal amount € 322  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3100  
Note 21 [Member]    
Issuance date 04/19/2012  
Principal amount € 80  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3100  
Note 22 [Member]    
Issuance date 05/04/2012  
Principal amount € 480  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3152  
Note 23 [Member]    
Issuance date 05/04/2012  
Principal amount € 120  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3152  
Note 24 [Member]    
Issuance date 09/03/2012  
Principal amount € 200  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.2576  
Note 25 [Member]    
Issuance date 09/03/2012  
Principal amount € 50  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.2576  
Note 26 [Member]    
Issuance date 11/14/2012  
Principal amount € 500  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.2718  
Note 27 [Member]    
Issuance date 12/06/2012  
Principal amount € 125  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3070  
Note 28 [Member]    
Issuance date 01/16/2013  
Principal amount € 240  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3318  
Note 29 [Member]    
Issuance date 01/16/2013  
Principal amount € 60  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3318  
Note 30 [Member]    
Issuance date 03/25/2013  
Principal amount € 400  
Interest rate 10.00%  
Conversion price | $ / shares   0.037
Fixed rate conversion 1.2915  
Note 31 [Member]    
Issuance date 04/14/2013  
Principal amount € 150  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3056  
Note 32 [Member]    
Issuance date 04/14/2013  
Principal amount € 600  
Interest rate 10.00%  
Conversion price | $ / shares   0.034
Fixed rate conversion 1.3056  
Note 33 [Member]    
Issuance date 05/15/2013  
Principal amount € 170  
Interest rate 10.00%  
Conversion price | $ / shares   0.037
Fixed rate conversion 1.2938  
Note 34 [Member]    
Issuance date 05/15/2013  
Principal amount € 680  
Interest rate 10.00%  
Conversion price | $ / shares   0.037
Fixed rate conversion 1.2938  
Note 35 [Member]    
Issuance date 06/24/2013  
Principal amount € 60  
Interest rate 10.00%  
Conversion price | $ / shares   0.025
Fixed rate conversion 1.3340  
Note 36 [Member]    
Issuance date 06/24/2013  
Principal amount € 240  
Interest rate 10.00%  
Conversion price | $ / shares   0.025
Fixed rate conversion 1.3340  
Note 37 [Member]    
Issuance date 08/05/2013  
Principal amount € 80  
Interest rate 10.00%  
Conversion price | $ / shares   0.018
Fixed rate conversion 1.3283  
Note 38 [Member]    
Issuance date 08/05/2013  
Principal amount € 320  
Interest rate 10.00%  
Conversion price | $ / shares   0.018
Fixed rate conversion 1.3283  
Note 39 [Member]    
Issuance date 03/01/2017  
Principal amount € 230  
Interest rate 2.50%  
Note 40 [Member]    
Issuance date 03/01/2017  
Principal amount € 920  
Interest rate 2.50%  
Note 41 [Member]    
Issuance date 10/18/2017  
Principal amount € 230  
Interest rate 2.50%  
Note 42 [Member]    
Issuance date 10/18/2017  
Principal amount € 920  
Interest rate 2.50%  
Note 43 [Member]    
Issuance date 06/01/2018  
Principal amount € 160  
Interest rate 2.50%  
Note 44 [Member]    
Issuance date 06/01/2018  
Principal amount € 640  
Interest rate 2.50%  
Note 45 [Member]    
Issuance date 11/10/2018  
Principal amount € 160  
Interest rate 2.50%  
Note 46 [Member]    
Issuance date 11/10/2018  
Principal amount € 640  
Interest rate 2.50%  
Note 47 [Member]    
Issuance date 06/15/2019  
Principal amount € 120  
Interest rate 2.50%  
Note 48 [Member]    
Issuance date 06/15/2019  
Principal amount € 480  
Interest rate 2.50%  
Note 49 [Member]    
Issuance date 12/20/2019  
Principal amount € 120  
Interest rate 2.50%  
Note 50 [Member]    
Issuance date 12/20/2019  
Principal amount € 480  
Interest rate 2.50%  
Note 51 [Member]    
Issuance date 06/15/2020  
Principal amount € 220  
Interest rate 2.50%  
Note 52 [Member]    
Issuance date 06/15/2020  
Principal amount € 880  
Interest rate 2.50%  
Note 53 [Member]    
Issuance date 12/15/2020  
Principal amount € 170  
Interest rate 2.50%  
Note 54 [Member]    
Issuance date 12/15/2020  
Principal amount € 680  
Interest rate 2.50%  
Note 55 [Member]    
Issuance date 08/15/2021  
Principal amount € 240  
Interest rate 2.50%  
Note 56 [Member]    
Issuance date 08/15/2021  
Principal amount € 960  
Interest rate 2.50%  
Note 57 [Member]    
Issuance date 04/30/2022  
Principal amount € 120  
Interest rate 2.50%  
Note 58 [Member]    
Issuance date 04/30/2022  
Principal amount € 480  
Interest rate 2.50%  
Note 59 [Member]    
Issuance date 08/15/2022  
Principal amount € 120  
Interest rate 2.50%  
Note 60 [Member]    
Issuance date 08/15/2022  
Principal amount € 480  
Interest rate 2.50%  
Note 61 [Member]    
Issuance date 12/31/2022  
Principal amount € 50  
Interest rate 2.50%  
Note 62 [Member]    
Issuance date 12/31/2022  
Principal amount € 200  
Interest rate 2.50%  
Note 63 [Member]    
Issuance date 02/28/2023  
Principal amount € 100  
Interest rate 2.50%  
Note 64 [Member]    
Issuance date 02/28/2023  
Principal amount € 400  
Interest rate 2.50%  
Note 65 [Member]    
Issuance date 05/30/2023  
Principal amount € 120  
Interest rate 2.50%  
Note 66 [Member]    
Issuance date 05/30/2023  
Principal amount € 480  
Interest rate 2.50%  
Note 1 [Member]    
Issuance date 06/23/2006  
Principal amount € 175  
Interest rate 10.00%  
Conversion price | $ / shares   $ 0.10