v3.20.1

Property, plant and equipment - Fully Owned (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | € 23,137 | € 16,692 |
Ending balance | 40,707 | 23,137 | € 16,692
Acquisition value |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 51,321 | 42,195 | 37,624
Additions | 22,380 | 10,392 | 5,312
Sales and disposals | (1,618) | (1,311) | (861)
Translation differences | (8) | 46 | 120
Reclassifications to right of use | (251) |  |
Ending balance | 71,823 | 51,321 | 42,195
Amortization, depreciations and impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 28,184 | 25,502 | 22,663
Sales and disposals | (1,620) | (1,310) | (855)
Translation differences | (15) | 18 | 61
Depreciation | 4,818 | 3,974 | 3,633
Reclassifications to right of use | (251) |  |
Ending balance | 31,117 | 28,184 | 25,502
Land and building improvements |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 2,325 | 2,394 |
Ending balance | 2,204 | 2,325 | 2,394
Land and building improvements | Acquisition value |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 5,011 | 4,736 | 4,412
Additions | 273 | 275 | 324
Ending balance | 5,284 | 5,011 | 4,736
Land and building improvements | Amortization, depreciations and impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 2,686 | 2,342 | 2,025
Translation differences |  |  | 1
Depreciation | 394 | 344 | 316
Ending balance | 3,080 | 2,686 | 2,342
Installation and machinery |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 14,628 | 12,565 |
Ending balance | 18,770 | 14,628 | 12,565
Installation and machinery | Acquisition value |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 38,031 | 33,060 | 29,733
Additions | 6,382 | 4,674 | 3,178
Sales and disposals | (1,521) | (486) | (844)
Reclassifications | 1,792 | 753 | 881
Translation differences | (30) | 29 | 112
Ending balance | 44,655 | 38,031 | 33,060
Installation and machinery | Amortization, depreciations and impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 23,403 | 20,495 | 18,252
Sales and disposals | (1,521) | (485) | (838)
Translation differences | (15) | 16 | 53
Depreciation | 4,018 | 3,377 | 3,027
Ending balance | 25,885 | 23,403 | 20,495
Furniture, fixtures & vehicles |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 1,632 | 802 |
Ending balance | 1,909 | 1,632 | 802
Furniture, fixtures & vehicles | Acquisition value |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 3,452 | 3,209 | 2,973
Additions | 649 | 1,039 | 246
Sales and disposals | (97) | (826) | (17)
Reclassifications | 3 | 13 |
Translation differences | 22 | 16 | 7
Ending balance | 4,028 | 3,452 | 3,209
Furniture, fixtures & vehicles | Amortization, depreciations and impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 1,819 | 2,407 | 2,184
Sales and disposals | (99) | (826) | (17)
Translation differences |  | 2 | 7
Depreciation | 399 | 236 | 234
Ending balance | 2,119 | 1,819 | 2,407
Other tangible assets |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 4,552 | 930 |
Ending balance | 17,825 | 4,552 | 930
Other tangible assets | Acquisition value |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 4,827 | 1,189 | 505
Additions | 15,076 | 4,404 | 1,564
Reclassifications | (1,795) | (766) | (881)
Translation differences |  |  | 1
Reclassifications to right of use | (251) |  |
Ending balance | 17,856 | 4,827 | 1,189
Other tangible assets | Amortization, depreciations and impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Beginning balance | 275 | 258 | 203
Depreciation | 7 | 17 | 55
Reclassifications to right of use | (251) |  |
Ending balance | € 31 | € 275 | € 258

X
- Definition Represents the amount of reclassification of right of use assets. + References No definition available. + Details
Name: | glpg_ReclassificationOfRightOfUseAssets
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_75_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DepreciationPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DisposalsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glpg_LandAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glpg_InstallationAndMachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glpg_FurnitureFixturesAndVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OtherPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |