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Lease Obligations (Lease Obligations) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015
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Operating Leased Assets [Line Items] |
Operating lease obligations, Less than 1 year | $ 4,107 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths
Operating lease obligations, 1 year | 1,847 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo
Operating lease obligations, 2 years | 764 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree
Operating lease obligations, Year 3 | 742 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFour
Operating lease obligations, 4 years | 187 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFive
Total | 7,647 us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Payments expected to received from sublease agreements |
Sublease payments expected to be received, Less than 1 year | 3,151 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsNextRollingTwelveMonths
Sublease payments expected to be received, 1 year | 1,315 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearTwo
Sublease payments expected to be received, 2 years | 309 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearThree
Sublease payments expected to be received, 3 years | 277 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearFour
Sublease payments expected to be received, 4 years | 71 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearFive
Total | 5,123 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Corporate Headquarters - San Diego, CA |
Operating Leased Assets [Line Items] |
Operating lease obligations, Less than 1 year | 686 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Operating lease obligations, 1 year | 704 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Operating lease obligations, 2 years | 723 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Operating lease obligations, Year 3 | 742 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFour / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Operating lease obligations, 4 years | 187 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFive / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Total | 3,042 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Payments expected to received from sublease agreements |
Sublease payments expected to be received, Less than 1 year | 433 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Sublease payments expected to be received, 1 year | 444 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearTwo / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Sublease payments expected to be received, 2 years | 455 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearThree / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Sublease payments expected to be received, 3 years | 465 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearFour / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Sublease payments expected to be received, 4 years | 116 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearFive / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Total | 1,913 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_CorporateHeadquartersSanDiegoCAMember
Bioscience and Technology Business Center - Lawrence, KS |
Operating Leased Assets [Line Items] |
Operating lease obligations, Less than 1 year | 54 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_BioscienceandTechnologyBusinessCenterLawrenceKSMember
Operating lease obligations, 1 year | 54 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_BioscienceandTechnologyBusinessCenterLawrenceKSMember
Operating lease obligations, 2 years | 41 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_BioscienceandTechnologyBusinessCenterLawrenceKSMember
Total | 149 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_BioscienceandTechnologyBusinessCenterLawrenceKSMember
Vacated Office and Research Facility - San Diego, CA |
Operating Leased Assets [Line Items] |
Operating lease obligations, Less than 1 year | 765 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeandResearchFacilitySanDiegoCAMember
Total | 765 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeandResearchFacilitySanDiegoCAMember
Vacated Office Office and Research Facility - Cranbury, NJ |
Operating Leased Assets [Line Items] |
Operating lease obligations, Less than 1 year | 2,602 us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Operating lease obligations, 1 year | 1,089 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Total | 3,691 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Payments expected to received from sublease agreements |
Sublease payments expected to be received, Less than 1 year | 212 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Sublease payments expected to be received, 1 year | 88 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinRollingYearTwo / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Total | 300 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_VacatedOfficeOfficeandResearchFacilityCranburyNJMember
Office and Research Facility - San Diego, CA |
Payments expected to received from sublease agreements |
Sublease payments expected to be received, Less than 1 year | 311 lgnd_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsNextRollingTwelveMonths / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
Total | $ 311 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember

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- Definition Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Rolling Year Five + References No definition available. + Details
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- Definition Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Rolling Year Four + References No definition available. + Details
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- Definition Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Rolling Year Three + References No definition available. + Details
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- Definition Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Rolling Year Two + References No definition available. + Details
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- Definition Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Rolling Twelve Months + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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