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Organization and Summary of Significant Accounting Policies Organization and Summary of Significant Accounting Policies (Policies)
12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Organization, Consolidation and Presentation of Financial Statements Disclosure [Policy Text Block]
Overview
Gilead Sciences, Inc. (Gilead, we or us), incorporated in Delaware on June 22, 1987, is a research-based biopharmaceutical company that discovers, develops and commercializes innovative medicines in areas of unmet medical need. With each new discovery and experimental drug candidate, we strive to transform and simplify care for people with life-threatening illnesses around the world. Gilead's primary areas of focus include human immunodeficiency virus (HIV), liver diseases such as hepatitis B virus (HBV) infection and hepatitis C virus (HCV) infection, oncology/inflammation and serious cardiovascular and respiratory conditions. We continue to add to our existing portfolio of products through our internal discovery and clinical development programs and through a product acquisition and in-licensing strategy.
Our product portfolio is comprised of Stribild®, Complera®/Eviplera®, Atripla®, Truvada®, Viread®, Emtriva®, Tybost®, Sovaldi®, Hepsera®, Vitekta®, Letairis®, Ranexa®, Cayston®, AmBisome® and Vistide®. We have U.S. and international commercial sales operations, with marketing subsidiaries in North and South America, Europe and Asia-Pacific. In addition, we also sell and distribute certain products through our corporate partners under royalty-paying collaborative agreements.
Basis of Presentation
The accompanying Consolidated Financial Statements include the accounts of Gilead, our wholly-owned subsidiaries and our joint ventures with Bristol-Myers Squibb Company (BMS), for which we are the primary beneficiary. We record a noncontrolling interest in our Consolidated Financial Statements to reflect BMS's interest in the joint ventures. All intercompany transactions have been eliminated. The Consolidated Financial Statements include the results of companies acquired by us from the date of each acquisition for the applicable reporting periods.
On January 25, 2013, we completed a two-for-one stock split in the form of a stock dividend to stockholders of record as of January 7, 2013, as declared on December 10, 2012. Accordingly, all share and per share amounts for all periods presented in these Consolidated Financial Statements and notes have been adjusted retroactively to reflect this stock split. Additionally, certain prior period amounts within our Consolidated Financial Statements and related notes have been reclassified to conform to the current presentation.
Significant Accounting Policies, Estimates and Judgements [Policy Text Block]
Significant Accounting Policies, Estimates and Judgments
The preparation of these Consolidated Financial Statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures. On an ongoing basis, management evaluates its significant accounting policies or estimates. We base our estimates on historical experience and on various market specific and other relevant assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ significantly from these estimates. Estimates are assessed each period and updated to reflect current information such as actual experience.
Revenue Recognition, Policy [Policy Text Block]
Revenue Recognition
Product Sales
We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, delivery to the customer has occurred, the price is fixed or determinable and collectability is reasonably assured. Upon recognition of revenue from product sales, provisions are made for government rebates such as Medicaid reimbursements, customer incentives such as cash discounts for prompt payment, distributor fees and expected returns of expired products, as appropriate.
Items Deducted from Gross Product Sales
Government Rebates and Chargebacks
We estimate reductions to our revenues for government-managed Medicaid programs as well as for certain other qualifying federal, state and foreign government programs. Our estimates take into consideration contractual terms, historical utilization rates, as available, new information regarding changes in these programs' regulations and guidelines that would impact the amount of the actual rebates, our expectations regarding future utilization rates for these programs and, for our U.S. product sales, channel inventory data obtained from our major U.S. wholesalers in accordance with our inventory management agreements. Government rebates that are invoiced directly to us are recorded in accrued government rebates on our Consolidated Balance Sheets. For qualified programs that can purchase our products through wholesalers at a lower contractual government price, the wholesalers charge back to us the difference between their acquisition cost and the lower contractual government price, which we record as allowances against accounts receivable.
Cash Discounts
We estimate cash discounts based on contractual terms, historical utilization rates, as available and our expectations regarding future utilization rates.
Distributor Fees
Under our inventory management agreements with our significant U.S. wholesalers, we pay the wholesalers a fee primarily for the compliance of certain contractually determined covenants such as the maintenance of agreed upon inventory levels. These distributor fees are based on a contractually determined fixed percentage of sales.
Product Returns
We do not provide our customers with a general right of product return, but typically permit returns if the product is damaged or defective when received by the customer, or in the case of product sold in the United States and certain countries outside the United States, if the product has expired. We will accept returns for product that will expire within six months or that have expired up to one year after their expiration dates. Our estimates for expected returns of expired products are based primarily on an ongoing analysis of historical return patterns.
Royalty Revenues
Royalty revenue from sales of our other products is generally recognized when received, which is generally in the quarter following the quarter in which the corresponding sales occur. Royalty revenue from sales of Lexiscan and AmBisome by Astellas US LLC and Astellas Pharma US, Inc., respectively, is recognized in the month following the month in which the corresponding sales occur.
Contract and Other Revenues
Revenue from non-refundable up-front license fees and milestone payments such as under a development collaboration or an obligation to supply product, is recognized as performance occurs and our obligations are completed. In accordance with the specific terms of our obligations under these arrangements, revenue is recognized as the obligation is fulfilled or ratably over the development or manufacturing period. Revenue associated with substantive at-risk milestones is recognized based upon the achievement of the milestones set forth in the respective agreements. Advance payments received in excess of amounts earned are classified as deferred revenue on our Consolidated Balance Sheets.
Revenue Recognition, Product Sales [Policy Text Block]
Product Sales
We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, delivery to the customer has occurred, the price is fixed or determinable and collectability is reasonably assured. Upon recognition of revenue from product sales, provisions are made for government rebates such as Medicaid reimbursements, customer incentives such as cash discounts for prompt payment, distributor fees and expected returns of expired products, as appropriate.
Revenue Recognition, Government Rebates [Policy Text Block]
Government Rebates and Chargebacks
We estimate reductions to our revenues for government-managed Medicaid programs as well as for certain other qualifying federal, state and foreign government programs. Our estimates take into consideration contractual terms, historical utilization rates, as available, new information regarding changes in these programs' regulations and guidelines that would impact the amount of the actual rebates, our expectations regarding future utilization rates for these programs and, for our U.S. product sales, channel inventory data obtained from our major U.S. wholesalers in accordance with our inventory management agreements. Government rebates that are invoiced directly to us are recorded in accrued government rebates on our Consolidated Balance Sheets. For qualified programs that can purchase our products through wholesalers at a lower contractual government price, the wholesalers charge back to us the difference between their acquisition cost and the lower contractual government price, which we record as allowances against accounts receivable.
Revenue Recognition, Cash Discounts [Policy Text Block]
Cash Discounts
We estimate cash discounts based on contractual terms, historical utilization rates, as available and our expectations regarding future utilization rates.
Revenue Recognition, Distributor Fees [Policy Text Block]
Distributor Fees
Under our inventory management agreements with our significant U.S. wholesalers, we pay the wholesalers a fee primarily for the compliance of certain contractually determined covenants such as the maintenance of agreed upon inventory levels. These distributor fees are based on a contractually determined fixed percentage of sales.
Revenue Recognition, Product Returns [Policy Text Block]
Product Returns
We do not provide our customers with a general right of product return, but typically permit returns if the product is damaged or defective when received by the customer, or in the case of product sold in the United States and certain countries outside the United States, if the product has expired. We will accept returns for product that will expire within six months or that have expired up to one year after their expiration dates. Our estimates for expected returns of expired products are based primarily on an ongoing analysis of historical return patterns.
Revenue Recognition, Royalty Revenues [Policy Text Block]
Royalty Revenues
Royalty revenue from sales of our other products is generally recognized when received, which is generally in the quarter following the quarter in which the corresponding sales occur. Royalty revenue from sales of Lexiscan and AmBisome by Astellas US LLC and Astellas Pharma US, Inc., respectively, is recognized in the month following the month in which the corresponding sales occur.
Revenue Recognition, Contract and Other Revenues [Policy Text Block]
Contract and Other Revenues
Revenue from non-refundable up-front license fees and milestone payments such as under a development collaboration or an obligation to supply product, is recognized as performance occurs and our obligations are completed. In accordance with the specific terms of our obligations under these arrangements, revenue is recognized as the obligation is fulfilled or ratably over the development or manufacturing period. Revenue associated with substantive at-risk milestones is recognized based upon the achievement of the milestones set forth in the respective agreements. Advance payments received in excess of amounts earned are classified as deferred revenue on our Consolidated Balance Sheets.
Shipping and Handling Cost, Policy [Policy Text Block]
Shipping and Handling Costs
Shipping and handling costs incurred for inventory purchases and product shipments are recorded in cost of goods sold in our Consolidated Statements of Income.
Research and Development Expenses, Policy [Policy Text Block]
Research and Development Expenses
Research and development (R&D) expenses consist primarily of personnel costs, including salaries, benefits and stock-based compensation, clinical studies performed by contract research organizations (CROs), materials and supplies, licenses and fees, milestone payments under collaboration arrangements and overhead allocations consisting of various support and facilities-related costs.
We charge R&D costs, including clinical study costs, to expense when incurred. Clinical study costs are a significant component of R&D expenses. Most of our clinical studies are performed by third-party CROs. We monitor levels of performance under each significant contract including the extent of patient enrollment and other activities through communications with our CROs. We accrue costs for clinical studies performed by CROs over the service periods specified in the contracts and adjust our estimates, if required, based upon our ongoing review of the level of effort and costs actually incurred by the CROs. All of our material CRO contracts are terminable by us upon written notice and we are generally only liable for actual services completed by the CRO and certain non-cancelable expenses incurred at any point of termination. Amounts paid in advance related to uncompleted services will be refunded to us if a contract is terminated.
Advertising Expenses, Policy [Policy Text Block]
Advertising Expenses
We expense the costs of advertising, including promotional expenses, as incurred. Advertising expenses were $216.2 million in 2013, $159.8 million in 2012 and $116.6 million in 2011.
Stock Based Compensation, Policy [Policy Text Block]
Stock-Based Compensation
We utilize share based compensation in the form of various types of equity-based awards, including restricted stock units (RSUs), performance units and stock options. Compensation expense is recognized in the Consolidated Statements of Income based on the estimated fair value at grant date. The estimated fair values of RSUs is based on the closing price of our common stock; of performance unit awards is based on either the Monte Carlo valuation methodology or the stock price on the date of grant; and of stock option awards is based on the Black-Scholes option valuation model.
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and Cash Equivalents
We consider highly liquid investments with insignificant interest rate risk and an original maturity of three months or less on the purchase date to be cash equivalents. Eligible instruments under our investment policy that are included in cash equivalents include commercial paper, money market funds, overnight repurchase agreements (repos) with major banks and authorized dealers and other bank obligations.
Marketable and Nonmarketable Securities, Policy [Policy Text Block]
Marketable and Nonmarketable Securities
We determine the appropriate classification of our marketable securities, which consist primarily of debt securities and variable rate demand obligations, at the time of purchase and reevaluate such designation at each balance sheet date. All of our marketable securities are considered as available-for-sale and carried at estimated fair values and reported in either cash equivalents, short-term marketable securities or long-term marketable securities. Unrealized gains and losses on available-for-sale securities are excluded from net income and reported in accumulated other comprehensive income (loss) as a separate component of stockholders' equity. Other income (expense), net, includes interest, dividends, amortization of purchase premiums and discounts, realized gains and losses on sales of securities and other-than-temporary declines in the fair value of securities, if any. The cost of securities sold is based on the specific identification method. We regularly review all of our investments for other-than-temporary declines in fair value. Our review includes the consideration of the cause of the impairment, including the creditworthiness of the security issuers, the number of securities in an unrealized loss position, the severity and duration of the unrealized losses, whether we have the intent to sell the securities and whether it is more likely than not that we will be required to sell the securities before the recovery of their amortized cost basis. When we determine that the decline in fair value of an investment is below our accounting basis and this decline is other-than-temporary, we reduce the carrying value of the security we hold and record a loss for the amount of such decline.
As a result of entering into collaborations, from time to time, we may hold investments in non-public companies. We record these nonmarketable securities at cost in other long-term assets, less any amounts for other-than-temporary impairment. We regularly review our securities for indicators of impairment. Investments in nonmarketable securities are not material for the periods presented.
Concentrations of Risk, [Policy Text Block]
Concentrations of Risk
We are subject to credit risk from our portfolio of cash equivalents and marketable securities. Under our investment policy, we limit amounts invested in such securities by credit rating, maturity, industry group, investment type and issuer, except for securities issued by the U.S. government. We are not exposed to any significant concentrations of credit risk from these financial instruments. The goals of our investment policy, in order of priority, are as follows: safety and preservation of principal and diversification of risk; liquidity of investments sufficient to meet cash flow requirements; and a competitive after-tax rate of return.
We are also subject to credit risk from our accounts receivable related to our product sales. The majority of our trade accounts receivable arises from product sales in the United States and Europe.
In 2012, we received payment on $460.6 million in past due accounts receivable from customers based in Spain. Included in this amount were proceeds from a one-time factoring arrangement where we sold receivables with a carrying value of $319.8 million, net of the allowance for doubtful accounts. We received proceeds of $349.7 million and recorded a gain of $29.9 million, resulting primarily from the reversal of the related allowance for doubtful accounts. This gain was recorded as an offset to selling, general and administrative (SG&A) expenses in our Consolidated Statement of Income. Subsequent to this transaction, we have had no continuing involvement with the transferred receivables, which were derecognized at the time of the sale.
As of December 31, 2013, our accounts receivable in Southern Europe, specifically Greece, Italy, Portugal and Spain, totaled approximately $845.7 million, of which $402.4 million were greater than 120 days past due and $175.7 million were greater than 365 days past due. To date, we have not experienced significant losses with respect to the collection of our accounts receivable. We believe that our allowance for doubtful accounts was adequate at December 31, 2013.
Certain of the raw materials and components that we utilize in our operations are obtained through single suppliers. Certain of the raw materials that we utilize in our operations are made at only one facility. Since the suppliers of key components and raw materials must be named in a new drug application (NDA) filed with the U.S. Food and Drug Administration (FDA) for a product, significant delays can occur if the qualification of a new supplier is required. If delivery of material from our suppliers were interrupted for any reason, we may be unable to ship our commercial products or to supply any of our product candidates for clinical trials.
Accounts Receivable, Policy [Policy Text Block]
Accounts Receivable
Trade accounts receivable are recorded net of allowances for wholesaler chargebacks related to government rebate programs, cash discounts for prompt payment, sales returns and doubtful accounts. Estimates for wholesaler chargebacks for government rebates, cash discounts and sales returns are based on contractual terms, historical trends and our expectations regarding the utilization rates for these programs. Estimates for our allowance for doubtful accounts are determined based on existing contractual payment terms, historical payment patterns of our customers and individual customer circumstances, an analysis of days sales outstanding by geographic region and a review of the local economic environment and its potential impact on government funding and reimbursement practices. Historically, the amounts of uncollectible accounts receivable that have been written off have been insignificant and consistent with management's expectations.
Inventories, Policy [Policy Text Block]
Inventories
Inventories are recorded at the lower of cost or market, with cost determined on a first-in, first-out basis. We periodically review the composition of our inventories in order to identify obsolete, slow-moving or otherwise unsaleable items. If unsaleable items are observed and there are no alternate uses for the inventory, we will record a write-down to net realizable value in the period that the impairment is first recognized.
When future commercialization is considered probable and the future economic benefit is expected to be realized, based on management's judgment, we capitalize pre-launch inventory costs prior to regulatory approval. A number of factors are taken into consideration, including the current status in the regulatory approval process, potential impediments to the approval process such as safety or efficacy, anticipated research and development initiatives that could impact the indication in which the compound will be used, viability of commercialization and marketplace trends. As of December 31, 2013 and 2012, the amount of pre-launch inventory on our Consolidated Balance Sheets was not significant.
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment
Property, plant and equipment is stated at cost less accumulated depreciation and amortization. Depreciation and amortization are recognized using the straight-line method. Repairs and maintenance costs are expensed as incurred. Estimated useful lives in years are as follows:
 
Description
Estimated Useful Life 
Buildings and improvements
20-35
Laboratory and manufacturing equipment
4-10
Office and computer equipment
3-7
Leasehold improvements
Shorter of useful life
or lease term

Office and computer equipment includes capitalized software. We had unamortized capitalized software costs on our Consolidated Balance Sheets of $84.2 million as of December 31, 2013 and $91.0 million as of December 31, 2012. Leasehold improvements and capitalized leased equipment are amortized over the shorter of the lease term or the asset's useful life. Amortization of capitalized leased equipment is included in depreciation expense. Capitalized interest on construction in-progress is included in property, plant and equipment. Interest capitalized in 2013, 2012 and 2011 was not significant.
Goodwill and Other Intangible Assets, Policy [Policy Text Block]
Goodwill and Intangible Assets
Goodwill represents the excess of the consideration transferred over the estimated fair value of assets acquired and liabilities assumed in a business combination. Intangible assets with indefinite useful lives are related to purchased in-process research and development (IPR&D) projects and are measured at their respective fair values as of the acquisition date. We do not amortize goodwill and intangible assets with indefinite useful lives. Intangible assets related to IPR&D projects are considered to be indefinite-lived until the completion or abandonment of the associated R&D efforts. If and when development is complete, which generally occurs if and when regulatory approval to market a product is obtained, the associated assets would be deemed finite-lived and would then be amortized based on their respective estimated useful lives at that point in time. We test goodwill and other indefinite-lived intangible assets for impairment on an annual basis and in between annual tests if we become aware of any events or changes that would indicate that it is more likely than not that the fair value of the assets below their carrying amounts.
Intangible assets with finite useful lives are amortized over their estimated useful lives, primarily on a straight-line basis, and are reviewed for impairment when facts or circumstances suggest that the carrying value of these assets may not be recoverable.
Impairment of Long-Lived Assets, Policy [Policy Text Block]
Impairment of Long-Lived Assets
The carrying value of long-lived assets is reviewed on a regular basis for the existence of facts or circumstances both internally and externally that may suggest impairment. Specific potential indicators of impairment include a significant decrease in the fair value of an asset, a significant change in the extent or manner in which an asset is used or a significant physical change in an asset, a significant adverse change in legal factors or in the business climate that affects the value of an asset, an adverse action or assessment by the FDA or another regulator, an accumulation of costs significantly in excess of the amount originally expected to acquire or construct an asset and operating or cash flow losses combined with a history of operating or cash flow losses or a projection or forecast that demonstrates continuing losses associated with an income producing asset.
Should there be an indication of impairment, we will test for recoverability by comparing the estimated undiscounted future cash flows expected to result from the use of the asset or asset group and its eventual disposition to the carrying amount of the asset or asset group. Any excess of the carrying value of the asset or asset group over its estimated fair value will be recognized as an impairment loss.
Valuation of Contingent Consideration Resulting from a Business Combination [Policy Text Block]
Valuation of Contingent Consideration Resulting from a Business Combination
In connection with certain acquisitions, we may be required to pay future consideration that is contingent upon the achievement of specified development, regulatory approval or sales-based milestone events. We record contingent consideration resulting from a business combination at its fair value on the acquisition date. Each quarter thereafter, we revalue these obligations and record increases or decreases in their fair value in R&D expense within our Consolidated Statement of Income until such time that the related product candidate receives marketing approval.
Increases or decreases in fair value of the contingent consideration liabilities can result from updates to assumptions such as the expected timing or probability of achieving the specified milestones, changes in projected revenues or changes in discount rates. Significant judgment is employed in determining these assumptions as of the acquisition date and for each subsequent period. Updates to assumptions could have a significant impact on our results of operations in any given period. Actual results may differ from estimates
Foreign Currency Translation, Transactions, and Contracts, Policy [Policy Text Block]
Foreign Currency Translation, Transaction Gains and Losses, and Hedging Contracts
Non-U.S. entity operations are recorded in the functional currency of each entity. Results of operations for non-U.S. dollar functional currency entities are translated into U.S. dollars using average currency rates. Assets and liabilities are translated using currency rates at period end. Foreign currency translation adjustments are recorded as a component of other comprehensive income (loss) within stockholders' equity. Foreign currency transaction gains and losses are recorded in other income (expense), net on our Consolidated Statements of Income. Net foreign currency transaction losses totaled $3.6 million in 2013, $10.7 million in 2012 and $21.3 million in 2011.
We hedge a portion of our foreign currency exposures related to outstanding monetary assets and liabilities as well as forecasted product sales using foreign currency exchange forward and option contracts. In general, the market risk related to these contracts is offset by corresponding gains and losses on the hedged transactions. The credit risk associated with these contracts is driven by changes in interest and currency exchange rates and, as a result, varies over time. By working only with major banks and closely monitoring current market conditions, we seek to limit the risk that counterparties to these contracts may be unable to perform. We also seek to limit our risk of loss by entering into contracts that permit net settlement at maturity. Therefore, our overall risk of loss in the event of a counterparty default is limited to the amount of any unrecognized gains on outstanding contracts (i.e., those contracts that have a positive fair value) at the date of default. We do not enter into derivative contracts for trading purposes, nor do we hedge our net investment in any of our foreign subsidiaries.
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments
We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities, which are required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as risks inherent in valuation techniques, transfer restrictions and credit risks. We determine the fair value of financial and non-financial assets and liabilities using the fair value hierarchy, which establishes three levels of inputs that may be used to measure fair value, as follows:
Level 1 inputs which include quoted prices in active markets for identical assets or liabilities;
Level 2 inputs which include observable inputs other than Level 1 inputs, such as quoted prices for similar assets or liabilities; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. For our marketable securities, we review trading activity and pricing as of the measurement date. When sufficient quoted pricing for identical securities is not available, we use market pricing and other observable market inputs for similar securities obtained from various third-party data providers. These inputs either represent quoted prices for similar assets in active markets or have been derived from observable market data; and
Level 3 inputs which include unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the underlying asset or liability. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques and significant management judgment or estimation.
Derivatives, Policy [Policy Text Block]
Derivative Financial Instruments
We recognize all derivative instruments as either assets or liabilities at fair value in our Consolidated Balance Sheets. Changes in the fair value of derivatives are recorded each period in current earnings or accumulated other comprehensive income (loss), depending on whether a derivative is designated as part of a hedge transaction and, if it is, the type of hedge transaction. We classify the cash flows from these instruments in the same category as the cash flows from the hedged items. We do not hold or issue derivative instruments for trading or speculative purposes.
We assess, both at inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of the hedged items. We also assess hedge ineffectiveness on a quarterly basis and record the gain or loss related to the ineffective portion to current earnings to the extent significant. If we determine that a forecasted transaction is no longer probable of occurring, we discontinue hedge accounting for the affected portion of the hedge instrument, and any related unrealized gain or loss on the contract is recognized in current earnings.
Income Tax, Policy [Policy Text Block]
Income Taxes
Our income tax provision is computed under the liability method. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant estimates are required in determining our provision for income taxes. Some of these estimates are based on interpretations of existing tax laws or regulations. Various factors may have favorable or unfavorable effects on our income tax rate. These factors include, but are not limited to, interpretations of existing tax laws, changes in tax laws and rates, our portion of the non-tax deductible pharmaceutical excise tax, the accounting for stock options and other share-based payments, mergers and acquisitions, the ability to manufacture product in our Cork, Ireland facility, the amortization of certain acquisition related intangibles for which we receive no tax benefit, expiration of the federal research tax credit, future levels of R&D spending, changes in accounting standards, changes in the mix of earnings in the various tax jurisdictions in which we operate, changes in overall levels of pre-tax earnings and resolution of federal, state and foreign income tax audits. The impact on our income tax provision resulting from the above mentioned factors may be significant and could have a negative impact on our consolidated net income.
We record liabilities related to uncertain tax positions in accordance with the guidance that clarifies the accounting for uncertainty in income taxes recognized in an enterprise's financial statements by prescribing a minimum recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. We do not believe any such uncertain tax positions currently pending will have a material adverse effect on our Consolidated Financial Statements, although an adverse resolution of one or more of these uncertain tax positions in any period could have a material impact on the results of operations for that period.
Recent Accounting Pronouncement, Policy [Policy Text Block]
Recent Accounting Pronouncements
In February 2013, the Financial Accounting Standards Board (FASB) issued an update to the existing standard for liabilities. The update provides guidance for the recognition, measurement and disclosure of obligations resulting from joint and several liability arrangements. For obligations for which the total amount is fixed at the reporting date, an entity will be required to measure those obligations as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors. Such entities will also be required to disclose the nature, amount and other significant information about the obligations. This guidance will become effective for us beginning in the first quarter of 2014. We believe that the adoption of this update will not have a material impact on our Consolidated Financial Statements.
In July 2013, the FASB issued an update related to presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss or a tax credit carryforward exists. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This guidance will become effective for us beginning in the first quarter of 2014. We believe that the adoption of this update will not have a material impact on our Consolidated Financial Statements.