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Subsequent Events (Details) - Subsequent Event $ in Millions	1 Months Ended
	Jan. 31, 2020 USD ($)
ADSs
Subsequent events
Equity Method Investment, Ownership Percentage	25.00%
Equity Method Investment, Aggregate Cost	$ 150.0
Incyte
Subsequent events
Percentage of development cost associated with global and US trials	55.00%
MorphoSys AG
Subsequent events
Percentage of development cost associated with global and US trials	45.00%
Upfront payment agreed to pay	$ 750.0
MorphoSys AG | Development and Regulatory Milestones | Maximum
Subsequent events
Developmental, regulatory and commercial milestones	740.0
MorphoSys AG | Commercialization Milestones | Maximum
Subsequent events
Developmental, regulatory and commercial milestones	$ 315.0

X

- Definition

The amount of Developmental, regulatory and commercial milestones agreed to pay.

+ References

No definition available.

+ Details

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Namespace Prefix:	incy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the upfront payment under the license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	incy_
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X

- Definition

Percentage of development cost associated with global and US trials.

+ References

No definition available.

+ Details

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Namespace Prefix:	incy_
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Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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