Summary of Significant Accounting Policies | 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation The consolidated financial statements include the accounts of Alkermes plc and its wholly-owned subsidiaries: Alkermes Ireland Holdings Limited; Daravita Pharma Ireland Limited; Daravita Limited; Alkermes Science Four Limited; Alkermes Science Five Limited; Alkermes Science Six Limited; Alkermes Pharma Ireland Limited; Alkermes U.S. Holdings, Inc.; Alkermes, Inc.; Alkermes Controlled Therapeutics, Inc.; Alkermes Europe, Ltd.; Alkermes Finance Ireland Limited; Alkermes Finance Ireland (No. 2) Limited; Alkermes Finance Ireland (No. 3) Limited; and Alkermes Finance S.à r.l. Intercompany accounts and transactions have been eliminated. Use of Estimates The preparation of the Company’s consolidated financial statements in accordance with accounting principles generally accepted in the United States (“U.S.”) (“GAAP”) requires management to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on‑going basis, the Company evaluates its estimates and judgments and methodologies, including those related to revenue from contracts with its customers and related allowances, impairment and amortization of intangibles and long‑lived assets, share‑based compensation, income taxes including the valuation allowance for deferred tax assets, valuation of investments, contingent consideration and litigation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions. Cash and Cash Equivalents The Company values its cash and cash equivalents at cost plus accrued interest, which the Company believes approximates their market value. The Company considers only those investments which are highly liquid, readily convertible into cash and so near their maturity, generally three months from the date of purchase, that they present insignificant risk of change in value because of interest rate changes to be cash equivalents. Investments The Company has investments in various types of securities, consisting primarily of U.S. government and agency obligations, corporate debt securities and debt securities issued by foreign agencies and backed by foreign governments. The Company generally holds its interest-bearing investments with major financial institutions and in accordance with documented investment policies. The Company limits the amount of credit exposure to any one financial institution or corporate issuer. At December 31, 2018, substantially all these investments were classified as available for sale and were recorded at fair value. Holding gains and losses on available-for-sale investments are considered “unrealized” and are reported within “Accumulated other comprehensive loss,” a component of shareholders’ equity. The Company uses the specific identification method for reclassifying unrealized gains and losses into earnings when investments are sold. The Company conducts periodic reviews to identify and evaluate each investment that has an unrealized loss, in accordance with the meaning of other-than-temporary impairment and its application to certain investments, as required by GAAP. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses on available-for-sale securities that are determined to be temporary, and not related to credit loss, are recorded in “Accumulated other comprehensive loss.” For securities with unrealized losses, the Company performs an analysis to assess whether it intends to sell or whether it would more likely than not be required to sell the security before the expected recovery of its amortized cost basis. If the Company intends to sell a security, or may be required to do so, the security’s decline in fair value is deemed to be other-than-temporary and the full amount of the unrealized loss is recorded within earnings as an impairment loss. Regardless of the Company’s intent to sell a security, the Company performs additional analysis on all securities with unrealized losses to evaluate losses associated with the creditworthiness of the security. Credit losses are identified where the Company does not expect to receive cash flows sufficient to recover the amortized cost basis of a security. The Company's held-to-maturity investments are restricted investments held as collateral under letters of credit related to certain of the Company's agreements and are included in “Investments—long-term,” in the accompanying consolidated balance sheets. Fair Value of Financial Instruments The Company’s financial assets and liabilities are recorded at fair value and are classified as Level 1, 2 or 3 within the fair value hierarchy, as described in the accounting standards for fair value measurement. The Company’s financial assets and liabilities consist of cash equivalents, investments, contingent consideration and warrants to purchase the common stock of a publicly traded company and are classified within the fair value hierarchy as follows: • Level 1 –these valuations are based on a market approach using quoted prices in active markets for identical assets. Valuations of these products do not require a significant degree of judgment. Assets utilizing Level 1 inputs at December 31, 2018 included U.S. treasury securities, marketable securities classified as cash equivalents and a fixed term deposit account; • Level 2 –these valuations are based on a market approach using quoted prices obtained from brokers or dealers for similar securities or for securities for which the Company has limited visibility into their trading volumes. Valuations of these financial instruments do not require a significant degree of judgment. Assets and liabilities utilizing Level 2 inputs at December 31, 2018 included U.S. government agency debt securities, debt securities issued by foreign agencies and backed by foreign governments and investments in corporate debt securities that are trading in the credit markets; and • Level 3 –these valuations are based on an income approach using certain inputs that are unobservable and are significant to the overall fair value measurement. Valuations of these products require a significant degree of judgment. At December 31, 2018, assets utilizing Level 3 inputs included contingent consideration, warrants to purchase the common stock of Recro Pharma, Inc. (“Recro”) and an investment in a corporate debt security. The carrying amounts reflected in the consolidated balance sheets for cash and cash equivalents, accounts receivable, other current assets, accounts payable and accrued expenses approximate fair value due to their short‑term nature. Inventory Inventory is stated at the lower of cost and net realizable value. Cost is determined using the first-in, first-out method. Included in inventory are raw materials used in production of pre-clinical and clinical products, which have alternative future use and are charged to R&D expense when consumed. The cost elements included within inventory include three primary categories for commercial products: cost of raw materials; direct labor; and overhead. Overhead is based on the normal capacity of the Company’s production facilities and does not include costs from abnormally low production or idle capacity, which are expensed directly to the consolidated statement of operations and comprehensive loss. Property, Plant and Equipment Property, plant and equipment are recorded at cost, subject to review for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Expenditures for repairs and maintenance are charged to expense as incurred and major renewals and improvements are capitalized. Depreciation is calculated using the straight‑line method over the following estimated useful lives of the assets: Asset group Term Buildings and improvements 15 - 40 years Furniture, fixtures and equipment 3 - 10 years Leasehold improvements Shorter of useful life or lease term Contingent Consideration The Company records contingent consideration it is entitled to receive at fair value on the acquisition date. The Company estimates the fair value of contingent consideration through valuation models that incorporate probability-adjusted assumptions related to the achievement of milestones and thus likelihood of receiving related payments. The Company revalues its contingent consideration each reporting period, with changes in the fair value of contingent consideration recognized within the consolidated statements of operations and comprehensive loss. Changes in the fair value of contingent consideration can result from changes to one or multiple inputs, including adjustments to discount rates, changes in the amount or timing of cash flows, changes in the assumed achievement or timing of any development or sales-based milestones and changes in the assumed probability associated with regulatory approval. The period over which the Company discounts its contingent consideration is based on the current development stage of the product candidate, the specific development plan for that product candidate, adjusted for the probability of completing the development steps, and when contingent payments would be triggered. In estimating the probability of success, the Company utilizes data regarding similar milestone events from several sources, including industry studies and the Company’s own experience. These fair value measurements are based on significant inputs not observable in the market. Significant judgment was employed in determining the appropriateness of these assumptions at the acquisition date and for each subsequent period. Accordingly, changes in assumptions described above could have a material impact on the increase or decrease in the fair value of contingent consideration recorded in any given period. Goodwill and Intangible Assets Goodwill represents the excess cost of the Company's investment in the net assets of acquired companies over the fair value of the underlying identifiable net assets at the date of acquisition. The Company’s goodwill consists solely of goodwill created as a result of the Company’s acquisition of Elan Drug Technologies (“EDT”) from Elan Corporation, plc (the “Business Combination”) in September 2011 and has been assigned to one reporting unit. A reporting unit is an operating segment or one level below an operating segment or a component to which goodwill is assigned when initially recorded. Goodwill is not amortized but is reviewed for impairment on an annual basis, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of the goodwill might not be recoverable. The Company has the option to first assess qualitative factors to determine whether it is necessary to perform the quantitative impairment test. If the Company elects this option and believes, as a result of the qualitative assessment, that it is more-likely-than-not that the fair value of its reporting unit is less than its carrying amount, the quantitative impairment test is required; otherwise, no further testing is required. Alternatively, the Company may elect to not first assess qualitative factors and immediately perform the quantitative impairment test. In the quantitative impairment test, the Company compares the fair value of its reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of its reporting unit, then the Company would record an impairment loss equal to the difference. The Company's finite-lived intangible assets, consisting of core developed technology and collaboration agreements acquired as part of the acquisition of EDT, were recorded at fair value at the time of their acquisition and are stated within the Company’s consolidated balance sheets net of accumulated amortization and impairments. The finite-lived intangible assets are amortized over their estimated useful lives using the economic use method, which reflects the pattern that the economic benefits of the intangible assets are consumed as revenue is generated from the underlying patent or contract. The useful lives of the Company's intangible assets are primarily based on the legal or contractual life of the underlying patent or contract, which does not include additional years for the potential extension or renewal of the contract or patent. Impairment of Long‑Lived Assets The Company reviews long‑lived assets to be held and used for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Conditions that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or a significant adverse change that would indicate that the carrying amount of an asset or group of assets is not recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. In the event that such cash flows are not expected to be sufficient to recover the carrying amount of the assets, the assets are written‑down to their estimated fair values. Long‑lived assets to be disposed of are carried at fair value less costs to sell them. Revenue from Contracts with Customers Effective January 1, 2018, the Company adopted the requirements of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (In thousands) Topic 606 Adjustment Contract assets $ 9,110 Inventory (8,209 ) Deferred tax asset 109 Contract liabilities—short-term (1,104 ) Contract liabilities—long-term (724 ) Accumulated deficit 818 $ — When entering into arrangements with customers, the Company identifies whether its performance obligations under the arrangement represent a distinct good or service or a series of distinct goods or services. If a contract contains more than one performance obligation, the Company allocates the total transaction price to each performance obligation in an amount based on the estimated relative standalone selling prices of the promised goods or services underlying each performance obligation. The fair value of performance obligations under the arrangement may be derived using an estimate of selling price if the Company does not sell the goods or services separately. The Company recognizes revenue when or as it satisfies a performance obligation by transferring an asset or providing a service to a customer. Management judgment is required in determining the consideration to be earned under an arrangement and the period over which the Company is expected to complete its performance obligations under an arrangement. Steering committee services that are not inconsequential or perfunctory and that are determined to be performance obligations are combined with other research services or performance obligations required under an arrangement, if any, in determining the level of effort required in an arrangement and the period over which the Company expects to complete its aggregate performance obligations. The Company adopted Topic 606 using the modified retrospective method. As such, the Company recognized the cumulative effect of initially applying Topic 606 as an adjustment to the opening balance of shareholders’ equity at January 1, 2018. Therefore, the comparative information has not been adjusted and continues to be reported under the old revenue recognition guidance (“Topic 605”). The quantitative impacts of the changes are set out below for each of the condensed consolidated balance sheet and the condensed consolidated statement of operations and comprehensive loss for the current reporting period. ADJUSTED CONDENSED CONSOLIDATED BALANCE SHEET December 31, 2018 (In thousands) As Reported Adjustment Balances Without Adoption of Topic 606 ASSETS Contract assets $ 8,230 $ (8,230 ) (1) $ — Inventory 90,196 8,847 (2) 99,043 Deferred tax asset 85,807 (133 ) (3) 85,674 LIABILITIES Contract liabilities—short-term $ 3,169 $ (3,169 ) (4) $ — Deferred revenue—short-term — 1,224 (4) 1,224 Contract liabilities—long-term 9,525 (9,525 ) (4) — Deferred revenue—long-term — 8,852 (4) 8,852 SHAREHOLDERS' EQUITY Accumulated deficit $ (1,185,368 ) $ 2,156 (5) $ (1,183,212 ) The adjustments are a result of the following: (1) Adjustment to contract assets to reverse revenue recognized over time under Topic 606. (2) Adjustment to inventory to add back the cost of goods manufactured related to the revenue transactions summarized in item (1), above. (3) Adjustment to deferred tax asset to apply the tax impact of the revenue transactions summarized in item (1), above. (4) Adjustments to contract liabilities—short-term and contract liabilities—long-term is to reclassify amounts previously classified as deferred revenue—short-term and deferred revenue—long-term under Topic 605. (5) Adjustment to accumulated deficit for the net impact of the transactions noted in items (1) through (4) above. ADJUSTED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Year Ended December 31, 2018 (In thousands, except per share amounts) As Reported Adjustment Balances Without Adoption of Topic 606 REVENUES: Manufacturing and royalty revenues $ 526,675 $ 1,911 (1) $ 528,586 Product sales, net 450,334 — 450,334 Research and development revenue 68,895 48,473 (2) 117,368 License revenue 48,370 (48,370 ) (3) — Total revenues 1,094,274 2,014 1,096,288 EXPENSES: Cost of goods manufactured and sold 176,420 (640 ) (4) 175,780 Research and development 425,406 — 425,406 Selling, general and administrative 526,408 — 526,408 Amortization of acquired intangible assets 65,168 — 65,168 Total expenses 1,193,402 (640 ) 1,192,762 Operating loss (99,128 ) 2,654 (96,474 ) Other (expense) income, net (27,839 ) — (27,839 ) Loss before income taxes (126,967 ) 2,654 (124,313 ) Income tax provision (benefit) 12,344 24 12,368 Net loss $ (139,311 ) $ 2,630 $ (136,681 ) Loss per ordinary share — basic and diluted $ (0.90 ) $ 0.02 $ (0.88 ) WEIGHTED AVERAGE NUMBER OF ORDINARY SHARES OUTSTANDING: Basic and diluted 155,112 155,112 155,112 The adjustments are a result of the following: (1) Adjustments to manufacturing and royalty revenues to recognize revenue under Topic 605 in the year ended December 31, 2018 that was recognized under Topic 606. (2) Adjustments to research and development revenue during the year ended December 31, 2018 to recognize revenue under Topic 605 that was recognized under Topic 606. (3) Adjustments to license revenue during the year ended December 31, 2018 to recognize revenue under Topic 605 that was recognized under Topic 606. (4) Adjustments to cost of goods manufactured and sold to recognize the cost from the transactions noted in item (1) above. The Company’s changes in assets and liabilities within its condensed consolidated statement of cash flows changed as a result of the differences in the condensed consolidated balance sheet and changes in net loss in the condensed consolidated statement of operations, but the overall cash flows used in operating activities did not change. Collaborative Arrangements The Company has entered into collaboration agreements with pharmaceutical companies including Janssen Pharmaceutica Inc. (“Janssen, Inc.”), Janssen Pharmaceutica International, a division of Cilag International AG (“Janssen International”), and Janssen Pharmaceutica N.V. (together with Janssen, Inc., Janssen International and their affiliates “Janssen”) for INVEGA SUSTENNA ® ® ® ® ® ® ® Manufacturing Revenue The Company recognizes manufacturing revenues from the sale of products it manufactures for resale by its licensees. Manufacturing revenues Prior to the adoption of Topic 606, the Company recorded manufacturing revenue from the sale of products it manufactures for resale by its partners after the Company had shipped such products and risk of loss had passed to the Company’s partner, assuming persuasive evidence of an arrangement existed, the sales price was fixed or determinable and collectability was reasonably assured. The Company is the exclusive manufacturer of RISPERDAL CONSTA for commercial sale under its manufacturing and supply agreement with Janssen. The Company determined that it is appropriate to record revenue under this agreement at the point in time when control of the product passes to Janssen, which is determined to be when the product has been fully manufactured, since Janssen does not control the product during the manufacturing process and, in the event Janssen terminates the manufacturing and supply agreement, it is uncertain whether, and at what amount, the Company would be reimbursed for performance completed to date for product not yet fully manufactured. The manufacturing process is considered fully complete once the finished goods have been approved for shipment by both the Company and Janssen. The sales price for certain of the Company’s manufacturing revenues is based on the end-market sales price earned by its licensees. As end-market sales generally occur after the Company has recorded manufacturing revenue, the Company estimates the sales price for such products based on information supplied to it by the Company’s licensees, its historical transaction experience and other third-party data. Differences between actual manufacturing revenues and estimated manufacturing revenues are reconciled and adjusted for in the period in which they become known, which is generally within the same quarter. The difference between the Company’s actual and estimated manufacturing revenues has not been material to date. Royalty Revenue The Company recognizes royalty revenues related to the sale of products by its licensees that incorporate the Company's technologies. Royalties, with the exception of those earned on sales of AMPYRA as set forth below, qualify for the sales-and-usage exemption under Topic 606 as (i) royalties are based strictly on the sales-and-usage by the licensee; and (ii) a license of intellectual property (“IP”) is the sole or predominant item to which such royalties relate. Based on this exemption, these royalties are earned in the period the products are sold by the Company's partner and the Company has a present right to payment. Royalties on AMPYRA manufactured under our license and supply agreements with Acorda are incorporated into the standard cost-based model described in the manufacturing revenues section, above, as the terms of such agreements entitle the Company to royalty revenue as the product is being manufactured, which represents a faithful depiction of the transfer of goods, and not based on the actual end-market sales of the licensee. Certain of the Company's royalty revenues are recognized by the Company based on information supplied to the Company by its licensees and require estimates to be made. Differences between actual royalty revenues and estimated royalty revenues are reconciled and adjusted for in the period in which they become known, which is generally within the same quarter. The difference between the Company’s actual and estimated royalty revenues has not been material to date. Research and Development Revenue R&D revenue consists of funding that compensates the Company for formulation, pre‑clinical and clinical testing under R&D arrangements with its partners. The Company generally bills its partners under R&D arrangements using a full‑time equivalent (“FTE”) or hourly rate, plus direct external costs, if any. Revenue is recognized as the obligations under the R&D arrangements are performed. License Revenue The Company recognizes revenue from the grant of distinct, right-to-use licenses of intellectual property (“IP”) when control of the license is transferred to the customer, which is the point in time the customer is able to direct the use of and obtain substantially all of the benefits from the license. Product Sales, Net The Company’s product sales, net consist of sales of VIVITROL ® ® in the U.S. primarily to wholesalers, specialty distributors and pharmacies. Product sales, net are recognized when the customer obtains control of the product, which is when the product has been received by the customer. Revenues from product sales are recorded net of reserves established for applicable discounts and allowances that are offered within contracts with the Company’s customers, health care providers or payers. The Company’s process for estimating reserves established for these variable consideration components does not differ materially from historical practices. The transaction price, which includes variable consideration reflecting the impact of discounts and allowances, may be subject to constraint and is included in the net sales price only to the extent that it is probable that a significant reversal of the amount of the cumulative revenues recognized will not occur in a future period. Actual amounts may ultimately differ from the Company’s estimates. If actual results vary, the Company adjusts these estimates, which could have an effect on earnings in the period of adjustment. The following are the Company’s significant categories of sales discounts and allowances: • Medicaid Rebates — the Company records accruals for rebates to states under the Medicaid Drug Rebate Program as a reduction of sales when the product is shipped into the distribution channel using the expected value method. The Company rebates individual states for all eligible units purchased under the Medicaid program based on a rebate per unit calculation, which is based on the Company’s average manufacturer prices. The Company estimates expected unit sales and rebates per unit under the Medicaid program and adjusts its rebate based on actual unit sales and rebates per unit. To date, actual Medicaid rebates have not differed materially from the Company’s estimates; • Chargebacks — discounts that occur when contracted indirect customers purchase directly from wholesalers and specialty distributors. Contracted customers generally purchase a product at its contracted price. The wholesaler or specialty distributor, in turn, then generally charges back to the Company the difference between the wholesale acquisition cost and the contracted price paid to the wholesaler or specialty distributor by the customer. The allowance for chargebacks is made using the expected value method and is based on actual and expected utilization of these programs. Chargebacks could exceed historical experience and the Company’s estimates of future participation in these programs. To date, actual chargebacks have not differed materially from the Company’s estimates; • Product Discounts — cash consideration, including sales incentives, given by the Company under agreements with a number of wholesaler, distributor, pharmacy, and treatment provider customers that provide them with a discount on the purchase price of products. The reserve is made using the expected value method and to date, actual product discounts have not differed materially from the Company’s estimates; and • Product Returns — the Company records an estimate for product returns at the time its customers take control of the Company’s product. The Company estimates this liability using the expected value method based on its historical return levels and specifically identified anticipated returns due to known business conditions and product expiry dates. Return amounts are recorded as a deduction to arrive at product sales, net. Once product is returned, it is destroyed. • Medicare Part D — the Company records accruals for Medicare Part D liabilities under the Medicare Coverage Gap Discount Program (“CGDP”) as a reduction of sales. Under the CGDP, patients reaching the annual coverage gap threshold are eligible for reimbursement coverage for out-of-pocket costs for covered prescription drugs. Under an agreement with the Center for Medicare and Medicaid, manufacturers are responsible to reimburse prescription plan sponsors for the portion of out-of-pocket expenses not covered under their Medicare plans. Receivables, net Receivables, net, include amounts billed and currently unconditionally due from customers. The amounts due are stated at their net estimated realizable value. The Company maintains an allowance for doubtful accounts to provide for the estimated amounts of receivables that will not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and collateral to the extent applicable. The Company’s allowance for doubtful accounts was $0.2 million at December 31, 2018 and 2017. Contract Assets Contract assets include unbilled amounts resulting from sales under certain of the Company’s manufacturing contracts where revenue is recognized over time. The products included in the contract assets table below complete the manufacturing process in ten days to eight weeks. Contract assets are classified as current. Contract assets consisted of the following: (In thousands) Contract Assets Contract assets at January 1, 2018 $ 9,110 Additions 57,617 Transferred to receivables, net (58,497 ) Contract assets at December 31, 2018 $ 8,230 Contract Liabilities The Company’s contract liabilities consist of contractual obligations related to deferred revenue. Contract liabilities consisted of the following: (In thousands) Contract Liabilities Contract liabilities at January 1, 2018 $ 9,442 Additions 6,381 Amounts recognized into revenue (3,129 ) Contract liabilities at December 31, 2018 $ 12,694 Foreign Currency The Company's functional and reporting currency is the U.S. dollar. Transactions in foreign currencies are recorded at the exchange rate prevailing on the date of the transaction. The resulting monetary assets and liabilities are translated into U.S. dollars at exchange rates prevailing on the subsequent balance sheet date. Gains and losses as a result of translation adjustments are recorded within “Other (expense) income, net” in the accompanying consolidated statements of operations and comprehensive loss. During the years ended December 31, 2018, 2017 and 2016 the Company recorded a (loss) gain on foreign currency translation of $(2.3) million, $3.7 million and $0.1 million, respectively. Concentrations Financial instruments that potentially subject the Company to concentrations of credit risk are receivables and marketable securities. Billings to large pharmaceutical companies account for the majority of the Company's receivables, and collateral is generally not required from these customers. To mitigate credit risk, the Company monitors the financial performance and credit worthiness of its customers. The following represents revenue and receivables from the Company's customers exceeding 10% of the total in each category as of, and for the years ended, December 31, 2018, 2017 and 2016: Year Ended December 31, 2018 2017 2016 Customer Receivables Revenue Receivables Revenue Receivables Revenue Janssen 27 % 29 % 31 % 33 % 33 % 36 % Acorda 15 % 10 % 14 % 13 % 17 % 15 % Cardinal Health * 13 % * * * * Biogen * 10 % * * * * * Indicates the revenues or receivables for the customer did not exceed 10% of the Company’s total in each category as of or for the years ended December 31, 2018, 2017 and 2016, as noted. The Company holds its interest‑bearing investments with major financial institutions and, in accordance with documented investment policies, the Company limits the amount of credit exposure to any one financial institution or corporate issuer. The Company’s investment objectives are, first, to assure liquidity and conservation of capital and, second, to obtain investment income. Geographic Information Company revenues by geographic location, as determined by the location of the customer, and the location of its assets, are as follows: Year Ended December 31, (In thousands) 2018 2017 2016 Revenue by region: U.S. $ 884,600 $ 700,090 $ 557,312 Ireland 4,915 9,706 4,407 Rest of world 204,759 193,578 183,975 Assets by region: Current assets: U.S. $ 546,533 $ 402,481 $ 382,168 Ireland 433,837 403,167 407,761 Rest of world 2,882 3,196
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