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Commitment and Contingencies - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) civil_complaint
Loss Contingencies [Line Items]
Increase in operating lease assets	$ 1.1
Increase in operating lease liabilities	$ 1.1
US District Court for the Northern District of Ohio
Loss Contingencies [Line Items]
Number of civil complaints filed against entity | civil_complaint	3

X

- Definition

Lessee, Increase (Decrease) In Operating Lease Assets Due To Modification

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Lessee, Increase (Decrease) In Operating Lease Liabilities Due To Modification

+ References

No definition available.

+ Details

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Namespace Prefix:	lgnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

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Period Type:	duration

X

- Details

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Namespace Prefix:
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