BASIS OF PRESENTATION	3 Months Ended
BASIS OF PRESENTATION	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS Impax Laboratories, Inc. (“Impax” or the “Company”) is a specialty pharmaceutical company that focuses on developing, manufacturing, marketing and distributing generic and branded pharmaceutical products. The Company has two reportable segments, referred to as “Impax Generics” and “Impax Specialty Pharma.” The Impax Generics division focuses on a broad range of therapeutic areas, including products having technically challenging drug-delivery mechanisms or unique product formulations. In addition to developing solid oral dosage products, the Impax Generics division’s portfolio includes alternative dosage form products, primarily through alliance and collaboration agreements with third parties. The Company’s Impax Specialty Pharma division is focused on the development and promotion, through the Company’s specialty sales force, of proprietary branded pharmaceutical products for the treatment of central nervous system (“CNS”) disorders and other select specialty segments. Tower Acquisition On March 9, 2015, Impax completed its acquisition of Tower Holdings, Inc. (“Tower”), including its operating subsidiaries CorePharma LLC (“CorePharma”) and Amedra Pharmaceuticals LLC (“Amedra Pharmaceuticals”), and Lineage Therapeutics Inc. (“Lineage”) for a purchase price of $691.3 million, net of $41.5 million of cash acquired and including the repayment of indebtedness of Tower and Lineage and post-closing working capital adjustments (collectively, the “Tower acquisition”). The privately-held companies specialized in the development, manufacture and commercialization of complex generic and branded pharmaceutical products. For additional information on the acquisition and the related financing of the acquisition, refer to “Note 2. Business Acquisition” and “Note 13. Debt.” Operating and Reporting Structure The Company currently operates in two divisions: the Impax Generics division and the Impax Specialty Pharma division. The Impax Generics division includes the Company’s legacy Global Pharmaceuticals business as well as the acquired CorePharma and Lineage businesses from the Tower acquisition. The Impax Specialty Pharma division includes the legacy Impax Pharmaceuticals business as well as the acquired Amedra Pharmaceuticals business from the Tower acquisition. Impax Generics develops, manufactures, sells, and distributes generic pharmaceutical products primarily through the following four sales channels: the “Impax Generics” sales channel, for generic pharmaceutical prescription products the Company sells directly to wholesalers, large retail drug chains, and others; the “Private Label” sales channel, for generic pharmaceutical over-the-counter (“OTC”) and prescription products the Company sells to unrelated third-party customers who, in turn, sell the product to third parties under their own label; the “Rx Partner” sales channel, for generic prescription products sold through unrelated third-party pharmaceutical entities under their own label pursuant to alliance agreements; and the “OTC Partner” sales channel, for generic pharmaceutical OTC products sold through unrelated third-party pharmaceutical entities under their own labels pursuant to alliance and supply agreements. Revenues from the “Impax Generics” sales channel and the “Private Label” sales channel are reported under the caption “Impax Generics sales, net” in “Note 23. Supplementary Financial Information.” The Company also generates revenue in Impax Generics from research and development services provided under a joint development agreement with another unrelated third-party pharmaceutical company, and reports such revenue under the caption “Other Revenues” in “Note 23. Supplementary Financial Information.” The Company provides these services through the research and development group in Impax Generics. Revenues from the “OTC Partner” sales channel are also reported under the caption “Other Revenues” in “Note 23. Supplementary Financial Information.” Impax Specialty Pharma is engaged in the development, sale and distribution of proprietary branded pharmaceutical products that the Company believes represent improvements to already-approved pharmaceutical products addressing CNS disorders and other select specialty segments. Impax Specialty Pharma currently has one internally developed branded pharmaceutical product, Rytary® (IPX066), an extended release oral capsule formulation of carbidopa-levodopa for the treatment of Parkinson’s disease, post-encephalitic parkinsonism, and parkinsonism that may follow carbon monoxide intoxication and/or manganese intoxication, which was approved by the FDA on January 7, 2015 and which the Company began marketing in the United States in April 2015. The Company received marketing authorization from the European Commission for NUMIENT™ (the brand name of IPX066 outside of the United States) during the fourth quarter of fiscal year 2015. In addition to Rytary®, Impax Specialty Pharma is also currently engaged in the sale and distribution of four other branded products; the more significant include Zomig® (zolmitriptan) products, indicated for the treatment of migraine headaches, under the terms of a Distribution, License, Development and Supply Agreement with AstraZeneca UK Limited (“AstraZeneca”) in the United States and in certain U.S. territories (the "AZ Agreement"), and EMVERM^TM (mebendazole) 100 mg chewable tablets, indicated for the treatment of pinworm, whipworm, common roundworm, common hookworm, and American hookworm in single or mixed infections. Revenues from Impax-labeled branded products are reported under the caption “Impax Specialty Pharma sales, net” in “Note 23. Supplementary Financial Information.” Finally, the Company generates revenue in Impax Specialty Pharma from research and development services provided under a development and license agreement with another unrelated third-party pharmaceutical company, and reports such revenue under the caption “Other Revenues” in “Note 23. Supplementary Financial Information.” Impax Specialty Pharma also has a number of product candidates that are in varying stages of development. See “Note 22. Segment Information,” for financial information about our segments for the three months ended March 31, 2016 and 2015. The Company owns and/or leases facilities in California, Pennsylvania, New Jersey and Taiwan, Republic of China (“R.O.C.”). In California, the Company utilizes a combination of owned and leased facilities mainly located in Hayward. The Company’s primary properties in California consist of a leased office building used as the Company’s corporate headquarters, in addition to five properties it owns, including a research and development center facility and a manufacturing facility. Additionally, the Company leases two facilities in Hayward, utilized for additional research and development, equipment storage and quality assurance support. In Pennsylvania, the Company leases facilities in New Britain and Montgomeryville used for sales and marketing, finance, and administrative personnel. In addition, the Company previously owned a packaging plant in Philadelphia, PA that was closed and sold in February 2016 in conjunction with the Company's restructuring of its packaging and distribution operations announced in June 2015 and discussed below in "Note 17. Restructurings". In New Jersey, the Company leases manufacturing, packaging, research and development and warehousing facilities in Middlesex, New Jersey and office space in Bridgewater, New Jersey. Outside the United States, in Taiwan, R.O.C., the Company owns a manufacturing facility. BASIS OF PRESENTATION Interim Financial Statements The accompanying unaudited interim consolidated financial statements have been prepared from the books and records of the Company in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information and Rule10-01 of Regulation S-X promulgated by the United States Securities and Exchange Commission (“SEC”), which permit reduced disclosures for interim periods. All adjustments necessary for a fair presentation of the accompanying balance sheets and statements of operations, comprehensive loss, and cash flows have been made. Although these interim consolidated financial statements do not include all of the information and footnotes required for complete annual financial statements, management believes the disclosures are adequate to make the information presented not misleading. Unaudited interim results of operations and cash flows are not necessarily indicative of the results that may be expected for the full year. Unaudited interim consolidated financial statements and footnotes should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the SEC, wherein a more complete discussion of significant accounting policies and certain other information can be found. Principles of Consolidation The Company's unaudited interim consolidated financial statements include the accounts of the operating parent company, Impax Laboratories, Inc., its wholly owned subsidiaries, including Impax Laboratories USA, LLC, Impax Laboratories (Taiwan), Inc., ThoRx Laboratories, Inc., Impax International Holdings, Inc., Impax Holdings, LLC, Impax Laboratories (Netherlands) C.V., Impax Laboratories (Netherlands) B.V., Impax Laboratories Ireland Limited, Lineage and Tower, including operating subsidiaries CorePharma, Amedra Pharmaceuticals, Mountain LLC and Trail Services, Inc., in addition to an equity investment in Prohealth Biotech (Taiwan), Inc. (“Prohealth”), in which the Company held a 57.54% majority ownership interest at March 31, 2016. All significant intercompany accounts and transactions have been eliminated. Foreign Currency Translation The Company translates the assets and liabilities of the Taiwan dollar functional currency of its majority-owned affiliate Prohealth and its wholly-owned subsidiary Impax Laboratories (Taiwan), Inc. into the U.S. dollar reporting currency using exchange rates in effect at the end of each reporting period. The revenues and expenses of these entities are translated using an average of the rates in effect during the reporting period. Gains and losses from these translations are recorded as currency translation adjustments included in the consolidated statements of comprehensive loss. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP and the rules and regulations of the SEC requires the use of estimates and assumptions, based on complex judgments considered reasonable, which affect the reported amounts of assets and liabilities and disclosure of contingent assets and contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The most significant judgments are employed in estimates used in determining values of tangible and intangible assets, legal contingencies, tax assets and tax liabilities, fair value of share-based compensation related to equity incentive awards issued to employees and directors, and estimates used in applying the Company’s revenue recognition policy, including those related to accrued chargebacks, rebates, product returns, Medicare, Medicaid, and other government rebate programs, shelf-stock adjustments, and the timing and amount of deferred and recognized revenue and deferred and amortized product manufacturing costs related to alliance and collaboration agreements. Actual results may differ from estimated results. Reclassifications Certain prior period amounts have been reclassified to conform to the current period presentation.