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Financing Arrangements (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | $ 334,000us-gaap_NotesPayableCurrent | $ 9,109,000us-gaap_NotesPayableCurrent
Long-term portion of notes payable | 195,908,000us-gaap_LongTermNotesPayable | 0us-gaap_LongTermNotesPayable
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | 334,000us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember | 0us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Minimum |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Interest on debt instrument (percent) | 2.16%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Maximum |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Interest on debt instrument (percent) | 3.84%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Current portion notes payable, 8.64%, due August 1, 2014 |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | 0us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointSixFourPercentDueAugustOneTwoThousandFourteenMember | 6,642,000us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointSixFourPercentDueAugustOneTwoThousandFourteenMember
Debt Instrument, Maturity Date | Aug. 01, 2014 |
Interest on debt instrument (percent) | 8.64%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointSixFourPercentDueAugustOneTwoThousandFourteenMember |
Current portion notes payable, 8.90%, due August 1, 2014 |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | 0us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointNineZeroOneTwoPercentDueAugustOneTwoThousandFourteenMember | 2,467,000us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointNineZeroOneTwoPercentDueAugustOneTwoThousandFourteenMember
Debt Instrument, Maturity Date | Aug. 01, 2014 |
Interest on debt instrument (percent) | 8.9012%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lgnd_CurrentPortionNotesPayableEightPointNineZeroOneTwoPercentDueAugustOneTwoThousandFourteenMember |
2019 Convertible Senior Notes |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Principal amount outstanding | 245,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember
Unamortized discount | (49,092,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember
Long-term portion of notes payable | $ 195,908,000us-gaap_LongTermNotesPayable / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | $ 0us-gaap_LongTermNotesPayable / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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