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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating activities |  |  |
Net income (loss) | $ 10,892us-gaap_ProfitLoss | $ 11,420us-gaap_ProfitLoss | $ (527)us-gaap_ProfitLoss
Less: gain from discontinued operations | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,588us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,147us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Income (loss) from continuing operations | 10,892us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 8,832us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (2,674)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |  |
Write-off of acquired in-process research and development | 0us-gaap_ResearchAndDevelopmentInProcess | 480us-gaap_ResearchAndDevelopmentInProcess | 0us-gaap_ResearchAndDevelopmentInProcess
Change in estimated fair value of contingent liabilities | 5,135lgnd_NonCashChangeInEstimatedFairValueOfContingentValueRights | 3,597lgnd_NonCashChangeInEstimatedFairValueOfContingentValueRights | 1,650lgnd_NonCashChangeInEstimatedFairValueOfContingentValueRights
Realized gain on sale of short-term investment | (1,538)us-gaap_RealizedInvestmentGainsLosses | 0us-gaap_RealizedInvestmentGainsLosses | 0us-gaap_RealizedInvestmentGainsLosses
Depreciation and amortization | 2,657us-gaap_DepreciationDepletionAndAmortization | 2,663us-gaap_DepreciationDepletionAndAmortization | 2,727us-gaap_DepreciationDepletionAndAmortization
Amortization of debt discount and issuance fees | 3,694us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized | 0us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized | 0us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Non-cash milestone revenue | (1,211)lgnd_NonCashMilestone | 0lgnd_NonCashMilestone | (1,212)lgnd_NonCashMilestone
(Gain) loss on asset disposal | (16)us-gaap_AssetImpairmentCharges | 5us-gaap_AssetImpairmentCharges | (17)us-gaap_AssetImpairmentCharges
Stock-based compensation | 11,270us-gaap_ShareBasedCompensation | 5,666us-gaap_ShareBasedCompensation | 4,067us-gaap_ShareBasedCompensation
Deferred income taxes | 410us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 374us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (1,204)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Accretion of note payable | 222us-gaap_IncreaseDecreaseInInterestPayableNet | 417us-gaap_IncreaseDecreaseInInterestPayableNet | 492us-gaap_IncreaseDecreaseInInterestPayableNet
Changes in operating assets and liabilities, net of acquisition: |  |  |
Accounts receivable, net | (10,412)us-gaap_IncreaseDecreaseInAccountsReceivable | 2,367us-gaap_IncreaseDecreaseInAccountsReceivable | 1,521us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory | 4,369us-gaap_IncreaseDecreaseInInventories | 646us-gaap_IncreaseDecreaseInInventories | 1,030us-gaap_IncreaseDecreaseInInventories
Other current assets | (426)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (130)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 515us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other long term assets | (1,439)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 218us-gaap_IncreaseDecreaseInOtherOperatingAssets | 334us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities | (3,155)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | (2,758)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | (4,801)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other liabilities | 34us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (391)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 484us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Deferred revenue | 80us-gaap_IncreaseDecreaseInDeferredRevenue | (654)us-gaap_IncreaseDecreaseInDeferredRevenue | (1,851)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities of continuing operations | 20,566us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 21,332us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 1,061us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in operating activities of discontinued operations | 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (642)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (900)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities | 20,566us-gaap_NetCashProvidedByUsedInOperatingActivities | 20,690us-gaap_NetCashProvidedByUsedInOperatingActivities | 161us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities |  |  |
Purchase of commercial license rights | (1,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (3,571)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Payments to CVR holders and other contingency payments | (3,493)lgnd_PaymentsToContingentValueRightHolders | (989)lgnd_PaymentsToContingentValueRightHolders | (8,049)lgnd_PaymentsToContingentValueRightHolders
Purchases of property and equipment | (6)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (377)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (595)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment | 125us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 3us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 20us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from sale of short-term investments | 2,342us-gaap_ProceedsFromSaleOfShortTermInvestments | 0us-gaap_ProceedsFromSaleOfShortTermInvestments | 10,000us-gaap_ProceedsFromSaleOfShortTermInvestments
Other, net | 5us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (40)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (113)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash (used in) provided by investing activities | (2,027)us-gaap_NetCashProvidedByUsedInInvestingActivities | (4,974)us-gaap_NetCashProvidedByUsedInInvestingActivities | 1,263us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities |  |  |
Proceeds from issuance of debt | 0us-gaap_ProceedsFromIssuanceOfDebt | 0us-gaap_ProceedsFromIssuanceOfDebt | 7,500us-gaap_ProceedsFromIssuanceOfDebt
Repayment of debt | (9,366)us-gaap_RepaymentsOfLongTermDebt | (19,586)us-gaap_RepaymentsOfLongTermDebt | (10,000)us-gaap_RepaymentsOfLongTermDebt
Gross proceeds from issuance of 2019 Convertible Senior Notes | 245,000us-gaap_ProceedsFromConvertibleDebt | 0us-gaap_ProceedsFromConvertibleDebt | 0us-gaap_ProceedsFromConvertibleDebt
Payment of debt issuance costs | (5,711)us-gaap_PaymentsOfDebtIssuanceCosts | 0us-gaap_PaymentsOfDebtIssuanceCosts | 0us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from issuance of warrants | 11,638us-gaap_ProceedsFromIssuanceOfWarrants | 0us-gaap_ProceedsFromIssuanceOfWarrants | 0us-gaap_ProceedsFromIssuanceOfWarrants
Purchase of convertible bond hedge | (48,143)lgnd_PaymentsforConvertibleBondHedges | 0lgnd_PaymentsforConvertibleBondHedges | 0lgnd_PaymentsforConvertibleBondHedges
Proceeds from issuance of common stock, net | 0us-gaap_ProceedsFromIssuanceOfCommonStock | 0us-gaap_ProceedsFromIssuanceOfCommonStock | 5,313us-gaap_ProceedsFromIssuanceOfCommonStock
Net proceeds from stock option exercises | 4,561us-gaap_ProceedsFromStockOptionsExercised | 3,128us-gaap_ProceedsFromStockOptionsExercised | 1,103us-gaap_ProceedsFromStockOptionsExercised
Share repurchases | (67,954)us-gaap_PaymentsForRepurchaseOfCommonStock | 0us-gaap_PaymentsForRepurchaseOfCommonStock | 0us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) provided by financing activities | 130,025us-gaap_NetCashProvidedByUsedInFinancingActivities | (16,458)us-gaap_NetCashProvidedByUsedInFinancingActivities | 3,916us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents | 148,564us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (742)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 5,340us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 11,639us-gaap_CashAndCashEquivalentsAtCarryingValue | 12,381us-gaap_CashAndCashEquivalentsAtCarryingValue | 7,041us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 160,203us-gaap_CashAndCashEquivalentsAtCarryingValue | 11,639us-gaap_CashAndCashEquivalentsAtCarryingValue | 12,381us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information |  |  |
Interest paid | 494us-gaap_InterestPaid | 1,816us-gaap_InterestPaid | 2,452us-gaap_InterestPaid
Taxes paid | 18us-gaap_IncomeTaxesPaid | 26us-gaap_IncomeTaxesPaid | 0us-gaap_IncomeTaxesPaid
Supplemental schedule of non-cash investing and financing activities |  |  |
Accrued inventory purchases | 3,246us-gaap_InventoryWriteDown | 341us-gaap_InventoryWriteDown | 1,426us-gaap_InventoryWriteDown
Unrealized gain on AFS investments | 3,872us-gaap_UnrealizedGainLossOnInvestments | 2,914us-gaap_UnrealizedGainLossOnInvestments | 0us-gaap_UnrealizedGainLossOnInvestments
Common stock released from restriction | $ 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures | $ 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures | $ 8,344us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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