XML 86 R25.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Basis of Presentation and Summary of Significant Accounting Policies - Derivatives (Details) - Convertible Notes - USD ($) | Jun. 30, 2018 | Jun. 19, 2018 | May 22, 2018 | Dec. 31, 2017 | Aug. 31, 2014
--- | --- | --- | --- | --- | ---
2023 Convertible Senior Notes |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Aggregate principal amount outstanding | $ 750,000,000 |  | $ 750,000,000 | $ 0 |
Interest rate (as a percent) |  |  | 0.75% |  |
Common stock price (USD per share) |  | $ 195.91 | $ 187.09 |  |
Exercise price, conversion premium and bond hedge (USD per share) |  | 248.48 | 248.48 |  |
Exercise price, warrant (USD per share) |  | $ 315.38 | $ 315.38 |  |
Risk-free interest rate (as a percent) |  | 2.80% | 2.90% |  |
Dividend yield (as a percent) |  | 0.00% | 0.00% |  |
Annual coupon rate (as a percent) |  | 0.75% | 0.75% |  |
Remaining contractual term (in years) |  | 4 years 11 months 23 days | 5 years |  |
2023 Convertible Senior Notes | Minimum |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Volatility (as a percent) |  | 30.00% | 30.00% |  |
2023 Convertible Senior Notes | Maximum |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Volatility (as a percent) |  | 35.00% | 35.00% |  |
2019 Convertible Senior Notes |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Aggregate principal amount outstanding | $ 223,215,000 |  |  | $ 245,000,000 | $ 245,000,000.0
Interest rate (as a percent) |  |  |  |  | 0.75%
Common stock price (USD per share) | $ 207.17 |  | $ 187.09 |  |
Exercise price, conversion premium and bond hedge (USD per share) | $ 75.05 |  | $ 75.05 |  | $ 75.05
Risk-free interest rate (as a percent) | 2.43% |  | 2.47% |  |
Dividend yield (as a percent) | 0.00% |  | 0.00% |  |
Annual coupon rate (as a percent) | 0.75% |  | 0.75% |  |
Remaining contractual term (in years) | 1 year 1 month 21 days |  | 1 year 3 months |  |
2019 Convertible Senior Notes | Minimum |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Volatility (as a percent) | 30.00% |  | 30.00% |  |
2019 Convertible Senior Notes | Maximum |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Volatility (as a percent) | 35.00% |  | 35.00% |  |

X
- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
Name: | invest_InvestmentWarrantsExercisePrice
Namespace Prefix: | invest_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives, Fair Value Assumptions, Annual Coupon Rate + References No definition available. + Details
Name: | lgnd_DerivativesFairValueAssumptionsAnnualCouponRate
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives, Fair Value Assumptions, Expected Dividend Rate + References No definition available. + Details
Name: | lgnd_DerivativesFairValueAssumptionsExpectedDividendRate
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives, Fair Value Assumptions, Expected Volatility Rate + References No definition available. + Details
Name: | lgnd_DerivativesFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives, Fair Value Assumptions, Risk Free Interest Rate + References No definition available. + Details
Name: | lgnd_DerivativesFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives, Weighted Average Remaining Contractual Term + References No definition available. + Details
Name: | lgnd_DerivativesWeightedAverageRemainingContractualTerm
Namespace Prefix: | lgnd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise Price of Convertible Bond Hedge + References No definition available. + Details
Name: | lgnd_ExercisePriceofConvertibleBondHedge
Namespace Prefix: | lgnd_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=lgnd_A2023ConvertibleSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=lgnd_A2019ConvertibleSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |