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Basis of Presentation (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 3,440us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 2,767us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross unrealized gains | 4,954us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains | 2,914us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross unrealized losses | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Estimated fair value | 8,394us-gaap_AvailableForSaleSecuritiesDebtSecurities | 5,681us-gaap_AvailableForSaleSecuritiesDebtSecurities
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 2,179us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 4,954us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 7,133us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Certificates of deposit - restricted |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,261us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember | 1,341us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember
Gross unrealized gains | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember
Gross unrealized losses | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember
Estimated fair value | 1,261us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember | 1,341us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = lgnd_CertificatesOfDepositRestrictedMember
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 1,426us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross unrealized gains |  | 2,914us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross unrealized losses |  | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Estimated fair value |  | $ 4,340us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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