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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

X

- 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



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X

- 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



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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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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-Publisher FASB

-Name Accounting Standards Codification

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