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Summary of significant accounting policies - Recent Accounting Pronouncements (Details) $ in Trillions | 1 Months Ended
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Mar. 31, 2020 USD ($)
Recent Accounting Pronouncements |
Coronavirus Aid, Relief, and Economic Security (CARES) Act | $ 2.2

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- Definition Represents the Coronavirus Aid, Relief, and Economic Security (CARES) Act funding in the US. + References No definition available. + Details
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Namespace Prefix: | incy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration