Debt Financing (Details) € / shares in Units, € in Thousands	6 Months Ended
	Jun. 30, 2021 EUR (€) € / shares
Total short term principal amounts	€ 34,750
Accrued interest	29,798
Total loans and notes	€ 64,548
Note 1
Issuance date	06/23/2006
Principal amount	€ 160
Interest rate	10.00%
Conversion price | € / shares	€ 0.10
Note 2
Issuance date	10/21/2007
Principal amount	€ 500
Interest rate	10.00%
Conversion price | € / shares	€ 0.50
Fixed rate conversion	1.4090
Note 3
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
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
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
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
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
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
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
Issuance date	06/15/2009
Principal amount	€ 100
Interest rate	10.00%
Conversion price | € / shares	€ 0.80
Fixed rate conversion	1.4300
Note 11
Issuance date	08/03/2009
Principal amount	€ 200
Interest rate	10.00%
Conversion price | € / shares	€ 0.80
Fixed rate conversion	1.4400
Note 12
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
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
Issuance date	08/04/2011
Principal amount	€ 1,010
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Note 15
Issuance date	08/04/2011
Principal amount	€ 253
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Note 16
Issuance date	11/08/2011
Principal amount	€ 400
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3787
Note 17
Issuance date	11/08/2011
Principal amount	€ 100
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3787
Note 18
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
Issuance date	02/14/2012
Principal amount	€ 200
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3260
Note 20
Issuance date	04/19/2012
Principal amount	€ 322
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3100
Note 21
Issuance date	04/19/2012
Principal amount	€ 80
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3100
Note 22
Issuance date	05/04/2012
Principal amount	€ 480
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3152
Note 23
Issuance date	05/04/2012
Principal amount	€ 120
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3152
Note 24
Issuance date	09/03/2012
Principal amount	€ 200
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.2576
Note 25
Issuance date	09/03/2012
Principal amount	€ 50
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.2576
Note 26
Issuance date	11/14/2012
Principal amount	€ 500
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.2718
Note 27
Issuance date	12/06/2012
Principal amount	€ 125
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3070
Note 28
Issuance date	01/16/2013
Principal amount	€ 240
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3318
Note 29
Issuance date	01/16/2013
Principal amount	€ 60
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3318
Note 30
Issuance date	03/25/2013
Principal amount	€ 400
Interest rate	10.00%
Conversion price | € / shares	€ 0.037
Fixed rate conversion	1.2915
Note 31
Issuance date	04/14/2013
Principal amount	€ 150
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3056
Note 32
Issuance date	04/14/2013
Principal amount	€ 600
Interest rate	10.00%
Conversion price | € / shares	€ 0.034
Fixed rate conversion	1.3056
Note 33
Issuance date	05/15/2013
Principal amount	€ 170
Interest rate	10.00%
Conversion price | € / shares	€ 0.037
Fixed rate conversion	1.2938
Note 34
Issuance date	05/15/2013
Principal amount	€ 680
Interest rate	10.00%
Conversion price | € / shares	€ 0.037
Fixed rate conversion	1.2938
Note 35
Issuance date	06/24/2013
Principal amount	€ 60
Interest rate	10.00%
Conversion price | € / shares	€ 0.025
Fixed rate conversion	1.3340
Note 36
Issuance date	06/24/2013
Principal amount	€ 240
Interest rate	10.00%
Conversion price | € / shares	€ 0.025
Fixed rate conversion	1.3340
Note 37
Issuance date	08/05/2013
Principal amount	€ 80
Interest rate	10.00%
Conversion price | € / shares	€ 0.018
Fixed rate conversion	1.3283
Note 38
Issuance date	08/05/2013
Principal amount	€ 320
Interest rate	10.00%
Conversion price | € / shares	€ 0.018
Fixed rate conversion	1.3283
Note 39
Issuance date	03/01/2017
Principal amount	€ 230
Interest rate	2.50%
Note 40
Issuance date	03/01/2017
Principal amount	€ 920
Interest rate	2.50%
Note 41
Issuance date	10/18/2017
Principal amount	€ 230
Interest rate	2.50%
Note 42
Issuance date	10/18/2017
Principal amount	€ 920
Interest rate	2.50%
Note 43
Issuance date	06/01/2018
Principal amount	€ 160
Interest rate	2.50%
Note 44
Issuance date	06/01/2018
Principal amount	€ 640
Interest rate	2.50%
Note 45
Issuance date	11/10/2018
Principal amount	€ 160
Interest rate	2.50%
Note 46
Issuance date	11/10/2018
Principal amount	€ 640
Interest rate	2.50%
Note 47
Issuance date	06/15/2019
Principal amount	€ 120
Interest rate	2.50%
Note 48
Issuance date	06/15/2019
Principal amount	€ 480
Interest rate	2.50%
Note 49
Issuance date	12/20/2019
Principal amount	€ 120
Interest rate	2.50%
Note 50
Issuance date	12/20/2019
Principal amount	€ 480
Interest rate	2.50%
Note 51
Issuance date	06/15/2020
Principal amount	€ 220
Interest rate	2.50%
Note 52
Issuance date	06/15/2020
Principal amount	€ 880
Interest rate	2.50%
Note 53
Issuance date	12/15/2020
Principal amount	€ 170
Interest rate	2.50%
Note 54
Issuance date	12/15/2020
Principal amount	€ 680
Interest rate	2.50%