v3.20.1

Operating costs - Summary of sales and marketing expenses (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating costs |  |  |
Personnel costs | € (7,558) | € (2,282) | € (2,156)
Depreciation | (61) |  |
External outsourcing costs | (15,722) | (1,284) | (42)
Other operating expenses | (1,236) | (580) | (604)
Total sales and marketing expenses | € (24,577) | € (4,146) | € (2,803)

X
- Definition The amount of depreciation expense incurred during period, included in sales and marketing expenses. + References No definition available. + Details
Name: | glpg_SalesAndMarketingDepreciationExpenses
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of external outsourcing costs incurred during period, included in sales and marketing expenses. + References No definition available. + Details
Name: | glpg_SalesAndMarketingExternalOutsourcingCosts
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sales and marketing other operating expenses. + References No definition available. + Details
Name: | glpg_SalesAndMarketingOtherOperatingExpenses
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sales and marketing personnel costs. + References No definition available. + Details
Name: | glpg_SalesAndMarketingPersonnelCosts
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_ExpenseByNatureAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense relating to the marketing and selling of goods or services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_SalesAndMarketingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration