GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - EUR (€) € in Thousands	Dec. 31, 2021	Dec. 31, 2020
Intangible assets
Intangible assets, gross	€ 2,484	€ 2,619
Accumulated amortization	(1,756)	(1,858)
Intangible assets, net	728	761
Licenses
Intangible assets
Intangible assets, gross	1,448	1,570
Accumulated amortization	(723)	(813)
Trade name and trademark
Intangible assets
Intangible assets, gross	400	412
Accumulated amortization	(397)	(409)
Patents
Intangible assets
Intangible assets, gross	412	412
Accumulated amortization	(412)	(412)
Organization Costs
Intangible assets
Intangible assets, gross	225	225
Accumulated amortization	€ (225)	€ (225)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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