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v3.3.0.814

Subsequent Event (Details) - USD ($) | Nov. 05, 2015 | Sep. 30, 2015
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Subsequent Event [Line Items] |  |
Percentage of increase in annual base rent, minimum |  | 3.00%
Corporate Headquarters - San Diego, CA | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Initial term of operating lease | 7 years |
Base annual rent | $ 125,000 |
Percentage of increase in annual base rent, minimum | 3.00% |
Length of renewal term for operating lease | 5 years |

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- Definition Lessee Leasing Arrangements, Operating Leases, Base Annual Rent + References No definition available. + Details
Name: | lgnd_LesseeLeasingArrangementsOperatingLeasesBaseAnnualRent
Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating leases of lessee contingent rentals basis spread on variable rate, minimum. + References No definition available. + Details
Name: | lgnd_OperatingLeasesOfLesseeContingentRentalsBasisSpreadOnVariableRateMinimum
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lgnd_CorporateHeadquartersSanDiegoCAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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