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Subsequent Event (Details) - Subsequent Event | Nov. 09, 2021 company
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Subsequent Event [Line Items] |
Number of separate, publicly traded companies into which entity plans to split | 2
OmniAb | IPO | Maximum |
Subsequent Event [Line Items] |
Proportion of common stock expected to be sold (as a percent) | 20.00%

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- Definition Number Of Entities Into Which Entity Plans To Split + References No definition available. + Details
Name: | lgnd_NumberOfEntitiesIntoWhichEntityPlansToSplit
Namespace Prefix: | lgnd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Sale Of Stock, Percentage Of Common Stock Expected To Be Sold + References No definition available. + Details
Name: | lgnd_SaleOfStockPercentageOfCommonStockExpectedToBeSold
Namespace Prefix: | lgnd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- 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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=lgnd_OmniAbMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |