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OPERATING LEASE RIGHT-OF-USE ASSETS (Details) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Right of use assets: |  |
Operating lease, right of use | € 1,895 | € 2,647
Facilities |  |
Right of use assets: |  |
Operating lease, right of use | 1,584 | 2,387
Equipment |  |
Right of use assets: |  |
Operating lease, right of use | 237 | 58
Furniture, fixture, fittings and other |  |
Right of use assets: |  |
Operating lease, right of use | € 74 | € 202

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |