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Stockholders' Equity - Shares available for grant (Details) | 12 Months Ended
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Dec. 31, 2020 shares
Shares Available For Grant |
Outstanding at the beginning of the period (in shares) | 9,882,122
Options, RSUs and PSUs granted (in shares) | (5,153,982)
Options, RSUs and PSUs cancelled (in shares) | 787,042
Outstanding at the end of the period (in shares) | 5,515,182

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- Definition Number of shares canceled under an established share-based compensation plan. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of shares granted under an established share-based compensation plan. + References No definition available. + Details
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Namespace Prefix: | incy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | incy_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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