ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization On May 20, 2020, Assertio Holdings, Inc. (Assertio or the Company) completed a Merger (the Zyla Merger) with Zyla Life Sciences (Zyla) pursuant to an Agreement and Plan of Merger (Merger Agreement), dated as of March 16, 2020. Prior to the consummation of the Zyla Merger, Assertio Therapeutics, Inc. implemented a holding company reorganization (Assertio Reorganization) pursuant to an Agreement and Plan of Merger, dated as of May 19, 2020, by and among Assertio Therapeutics, Inc., the Company and a wholly-owned subsidiary formed to effectuate the Assertio Reorganization. As a result of the Assertio Reorganization, Assertio Therapeutics, Inc. became a direct, wholly-owned subsidiary of the Company, with the Company assuming Assertio Therapeutics, Inc.’s listing on the Nasdaq Stock Market and being deemed as successor issuer to Assertio Therapeutics, Inc. under applicable securities law. Each issued and outstanding share of common stock, $0.0001 par value per share, of Assertio Therapeutics, Inc. immediately prior to the Assertio Reorganization automatically converted into an equivalent corresponding share of common stock, $0.0001 par value per share, of the Company having the same designations, rights, powers, preferences, qualifications, limitations and restrictions as the converted share of Assertio Therapeutics, Inc. common stock. Unless otherwise noted or required by context, the Company uses “Assertio” to refer to Assertio Reorganization and Assertio Holdings, Inc. following the Assertio Reorganization. Assertio is a commercial pharmaceutical company offering differentiated products to patients. The Company’s commercial portfolio of branded products focuses on three areas: neurology; hospital; and pain and inflammation. The Company has built its commercial portfolio through a combination of increased opportunities with its existing products, as well as through the acquisition or licensing of additional approved products. The Company’s primary marketed products include: SPRIX Nasal Spray ® (ketorolac) A nonsteroidal anti-inflammatory drug (NSAID) indicated in adult patients for the short term (up to five days) management of moderate to moderately severe pain that requires analgesia at the opioid level. CAMBIA ® (diclofenac potassium for oral solution) A prescription medicine used to treat migraine attacks in adults. It does not prevent or lessen the number of migraines one has, and it is not for other types of headaches. It contains diclofenac potassium, an NSAID. INDOCIN ® (indomethacin) Suppositories INDOCIN ® (indomethacin) Oral Suspension A suppository form and oral solution of indomethacin approved for: • Moderate to severe rheumatoid arthritis including acute flares of chronic disease • Moderate to severe ankylosing spondylitis • Moderate to severe osteoarthritis • Acute painful shoulder (bursitis and/or tendinitis) • Acute gouty arthritis ZIPSOR ® (diclofenac potassium) Liquid filled capsules) A prescription NSAID used for relief of mild-to-moderate pain in adults (18 years of age and older) Additional commercially available products include ZORVOLEX® (diclofenac), VIVLODEX® (meloxicam) (collectively the SOLUMATRIX® products), and OXAYDO® (oxycodone HCI, USP) tablets for oral use only —CII. In September 2020, the Company terminated its Second Amended and Restated Nano-Reformulated Compound License Agreement as of January 27, 2020 (the “iCeutica License”), with iCeutica Inc. and iCeutica Pty Ltd. (collectively, “iCeutica”). The iCeutica License allowed the Company to utilize certain technology and intellectual property related to iCeutica’s SOLUMATRIX technology and certain other rights of iCeutica. The intellectual property related to SOLUMATRIX technology will no longer be used by the Company and the Company will no longer manufacture products using SOLUMATRIX technology. On February 13, 2020, the Company completed the sale of its remaining rights, title and interest in and to the NUCYNTA® franchise to Collegium Pharmaceutical, Inc. (Collegium) for $375.0 million, less royalties, in cash at closing. Collegium assumed certain contracts, liabilities and obligations relating to the NUCYNTA products, including those related to manufacturing and supply, post-market commitments and clinical development costs. Collegium also paid for certain inventories relating to the products. On January 10, 2020, the Company completed the sale of Gralise ® (gabapentin) to Golf Acquiror LLC, an affiliate to Alvogen, Inc. (Alvogen), for cash proceeds of $130.3 million. The total value included $75.0 million in cash at closing, with the balance receivable as 75% of Alvogen’s first $70.0 million of Gralise net sales after the closing (consideration receivable). Alvogen also paid for certain inventories relating to Gralise. On June 3, 2020, the Company entered into an agreement with Alvogen to settle the remaining balance of $39.7 million in consideration receivable, whereby the Company reduced the consideration receivable by $0.9 million and Alvogen paid $38.8 million in cash. Basis of Presentation The unaudited condensed consolidated financial statements of Assertio and its subsidiaries and the related footnote information of the Company have been prepared pursuant to the requirements of the Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules and regulations, certain footnotes or other financial information that are normally required by U.S. generally accepted accounting principles (U.S. GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of the Company’s management, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair presentation of the information for the periods presented. The results for the three and nine months ended September 30, 2020 are not necessarily indicative of results to be expected for the entire year ending December 31, 2020 or future operating periods. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2019 included in Assertio Therapeutics, Inc.’s Annual Report on Form 10-K filed with the SEC on March 10, 2020 (the 2019 Form 10-K). The Consolidated Condensed Balance Sheet as of December 31, 2019 has been derived from the audited financial statements at that date, as filed in the Company’s 2019 Form 10-K. In connection with the preparation of the financial statements for the three and nine months ended September 30, 2020, the Company evaluated whether there were conditions and events, considered in the aggregate, which raised substantial doubt as to the entity's ability to continue as a going concern within twelve months after the date of the issuance of these financial statements noting that there did not appear to be evidence of substantial doubt of the entity's ability to continue as a going concern. Principles of Consolidation The condensed consolidated financial statements of Assertio include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Estimates are used when accounting for amounts recorded in connection with acquisitions, including initial fair value determinations of assets and liabilities as well as subsequent fair value measurements. Additionally, estimates are used in determining items such as sales discounts and product returns, depreciable and amortizable lives, share-based compensation assumptions and taxes on income. Although management believes these estimates are based upon reasonable assumptions within the bounds of its knowledge of the Company’s business and operations, actual results could differ materially from these estimates. Segment Information The Company manages its business within one reportable segment. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance. To date, substantially all of the Company’s revenues from product sales are related to sales in the United States. Acquisitions The Company accounts for acquired businesses using the acquisition method of accounting under ASC 805, Business Combinations (ASC 805), which requires that assets acquired and liabilities assumed be recorded at date of acquisition at their respective fair values. The fair value of the consideration paid, including contingent consideration, is assigned to the underlying net assets of the acquired business based on their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. Significant judgments are used in determining the estimated fair values assigned to the assets acquired and liabilities assumed and in determining estimates of useful lives of long-lived assets. Fair value determinations and useful life estimates are based on, among other factors, estimates of expected future net cash flows, estimates of appropriate discount rates used to present value expected future net cash flows, the assessment of each asset’s life cycle, and the impact of competitive trends on each asset’s life cycle and other factors. These judgments can materially impact the estimates used to allocate acquisition date fair values to assets acquired and liabilities assumed and the resulting timing and amounts charged to, or recognized in current and future operating results. For these and other reasons, actual results may vary significantly from estimated results. Any changes in the fair value of contingent consideration resulting from a change in the underlying inputs is recognized in operating expenses until the contingent consideration arrangement is settled. Changes in the fair value of contingent consideration resulting from the passage of time are recorded within interest expense until the contingent consideration is settled. If the acquired net assets do not constitute a business under the acquisition method of accounting, the transaction is accounted for as an asset acquisition and no goodwill is recognized. In an asset acquisition, the amount allocated to acquired in-process research and development (IPR&D) with no alternative future use is charged to expense at the acquisition date. Revenue Recognition Under ASC 606, Revenue from Contracts with Customers (ASC 606), the Company recognizes revenue when its customer obtains control of the promised goods or services, in an amount that reflects the consideration which the Company expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of ASC 606, the Company performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the Company satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that Company will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within each contract and determines those that are performance obligations and assesses whether each promised good or service is distinct. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation, when (or as) the performance obligation is satisfied. The Company assesses the term of the contract based upon the contractual period in which the Company and Collegium have enforceable rights and obligations. Variable consideration arising from sales or usage-based royalties, promised in exchange for a license of the Company’s Intellectual Property, is recognized at the later of (i) when the subsequent product sales occur or (ii) the performance obligation, to which some or all of the sales-based royalty has been allocated, has been satisfied. The Company recognizes a contract asset relating to its conditional right to consideration for completed performance obligations. Accounts receivable are recorded when the right to consideration becomes unconditional. A contract liability is recorded for payments received in advance of the related performance obligation being satisfied under the contract. Product Sales The Company sells commercial products to wholesale distributors and specialty pharmacies. Product sales revenue is recognized when title has transferred to the customer and the customer has assumed the risks and rewards of ownership, which typically occurs on delivery to the customer. The Company’s performance obligation is to deliver product to the customer, and the performance obligation is completed upon delivery. The transaction price consists of a fixed invoice price and variable product sales allowances, which include rebates, discounts and returns. Product sales revenues are recorded net of applicable sales tax and reserves for these product sales allowances. Receivables related to product sales are typically collected one Product Sales Allowances—The Company considers products sales allowances to be variable consideration and estimates and recognizes product sales allowances as a reduction of product sales in the same period the related revenue is recognized. Product sales allowances are based on actual or estimated amounts owed on the related sales. These estimates take into consideration the terms of the Company’s agreements with customers, historical product returns, rebates or discounts taken, estimated levels of inventory in the distribution channel, the shelf life of the product and specific known market events, such as competitive pricing and new product introductions. The Company uses the most likely method in estimating product sales allowances. If actual future results vary from the Company’s estimates, the Company may need to adjust these estimates, which could have an effect on product sales and earnings in the period of adjustment. The Company’s sales allowances include: Product Returns—The Company allows customers to return product for credit with respect to that product within six months before and up to 12 months after its product expiration date. The Company estimates product returns and associated credit on NUCYNTA, Gralise, CAMBIA, Zipsor, Lazanda and products acquired from Zyla, INDOCIN, ZORVOLEX, VIVLODEX and OXAYDO. Estimates for returns are based on historical return trends by product or by return trends of similar products, taking into consideration the shelf life of the product at the time of shipment, shipment and prescription trends, estimated distribution channel inventory levels and consideration of the introduction of competitive products. The Company did not assume financial responsibility for returns of NUCYNTA previously sold by Janssen Pharma or Lazanda product previously sold by Archimedes Pharma US Inc. Under the Commercialization Agreement with Collegium for NUCYNTA, the divestiture of Lazanda to Slán and the divestiture of Gralise to Alvogen, the Company is only financially responsible for product returns for product that were sold by the Company, which are identified by specific lot numbers. Shelf lives, from the respective manufacture dates, for the Company’s products range from 24 months to 48 months. Because of the shelf life of the Company’s products and its return policy of issuing credits with respect to product that is returned within six months before and up to 12 months after its product expiration date, there may be a significant period of time between when the product is shipped and when the Company issues credit on a returned product. Accordingly, the Company may have to adjust these estimates, which could have an effect on product sales and earnings in the period of adjustments. Wholesaler and Pharmacy Discounts—The Company offers contractually determined discounts to certain wholesale distributors and specialty pharmacies that purchase directly from it. These discounts are either taken off invoice at the time of shipment or paid to the customer on a quarterly basis one Prompt Pay Discounts—The Company offers cash discounts to its customers (generally 2% of the sales price) as an incentive for prompt payment. Based on the Company’s experience, the Company expects its customers to comply with the payment terms to earn the cash discount. Patient Discount Programs—The Company offers patient discount co-pay assistance programs in which patients receive certain discounts off their prescriptions at participating retail and specialty pharmacies. The discounts are reimbursed by the Company to program administrators approximately one month after the prescriptions subject to the discount are filled. Medicaid Rebates—The Company participates in Medicaid rebate programs, which provide assistance to certain low income patients based on each individual state’s guidelines regarding eligibility and services. Under the Medicaid rebate programs, the Company pays a rebate to each participating state, generally two Chargebacks—The Company provides discounts to authorized users of the Federal Supply Schedule (FSS) of the General Services Administration under an FSS contract with the Department of Veterans Affairs and 340B eligible entities. These federal and 340B entities purchase products from the wholesale distributors at a discounted price, and the wholesale distributors then charge back to the Company the difference between the current retail price and the price the federal entity paid for the product. Managed Care Rebates—The Company offers discounts under contracts with certain managed care providers. The Company generally pays managed care rebates one Medicare Part D Coverage Gap Rebates — The Company participates in the Medicare Part D Coverage Gap Discount Program under which it provides rebates on prescriptions that fall within the “donut hole” coverage gap. The Company generally pays Medicare Part D Coverage Gap rebates two Royalty Revenue For arrangements that include sales-based royalties and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes royalty revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied). The Company currently has the right to receive royalties based on sales of CAMBIA in Canada, which are recognized as revenue when the related sales occur as there are no continuing performance obligations by the Company under those agreements. Milestones For arrangements that include milestones, the Company recognizes such revenue using the most likely method. As part of adopting ASC 606, the Company evaluated whether the future milestones should have been included as part of the transaction price in periods before January 1, 2018. The Company concluded that because of development and regulatory risks at the time, it was probable that a significant revenue reversal could have occurred. At the end of each subsequent reporting period, the Company re-evaluates the probability or achievement of each such milestone and any related constraint, and if necessary, adjusts its estimates of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect revenue in the period of adjustment. Leases The Company adopted ASC 842, Leases (ASC 842), on January 1, 2019 using the modified retrospective approach with cumulative effect. There was no adjustment to the Company's opening balance of accumulated deficit resulting from the adoption of this guidance. In addition, the Company elected the package of practical expedients, which among other things, allowed for the carryforward of the historical lease classification. The Company did not elect the hindsight practical expedient to determine the reasonably certain lease term for existing leases. Prior to the adoption of ASC 842, the Company accounted for its operating leases in accordance with ASC 840. Under ASC 840, only capital leases were recognized on the balance sheet and therefore the Company’s operating leases were reflected in the financial statement footnotes. The adoption of ASC 842 did not materially affect the Company’s Condensed Consolidated Statements of Comprehensive Income. The Company assesses contracts for lease arrangements at inception and, if applicable, upon any partial or full lease termination event. Operating right-of-use (ROU) assets and liabilities are recognized at the lease commencement date equal to the present value of future lease payments using the implicit, if readily available, or incremental borrowing rate based on the information readily available at the commencement date. ROU assets include any lease payments as of commencement and initial direct costs but exclude any lease incentives. Lease and non-lease components are generally accounted for separately and the Company recognizes operating lease expense straight-line over the term of the lease. Operating leases are included in other long term assets, other current liabilities, and other long term liabilities in the Condensed Consolidated Balance Sheet. The Company accounts for operating leases with an initial term of 12 months or less on a straight-line basis over the lease term in the Condensed Consolidated Statements of Comprehensive Income. Stock Based Compensation The Company’s stock-based compensation generally includes stock options, restricted stock unit awards (RSUs), performance share unit awards (PSUs), and purchases under the Company’s employee stock purchase plan (ESPP). The Company accounts for forfeitures as they occur for each type of award. Stock-based compensation expense related to RSUs is based on the market value of the underlying stock on the date of grant and the related expense is recognized ratably over the requisite service period. The stock-based compensation expense related to PSUs is estimated at grant date based on the fair value of the award. The PSU awards are measured exclusively to the relative total shareholder return (TSR) performance, which is measured against the three-year TSR of a custom index of companies. The actual number of shares awarded is adjusted to between zero and 200% of the target award amount based upon achievement in each of the three expense is recognized ratably over the requisite service period regardless of whether or not the market condition is satisfied. The Monte Carlo valuation model considers a variety of potential future share prices for Assertio and our peer companies in a selected market index. The Company uses the Black-Scholes option valuation model to determine the fair value of stock options and ESPP shares. The determination of the fair value of stock-based payment awards on the date of grant using an option valuation model is affected by our stock price as well as assumptions, which include the expected term of the award, the expected stock price volatility, risk-free interest rate and expected dividends over the expected term of the award. The Company uses historical option exercise data to estimate the expected term of the options. The Company estimates the volatility of our common stock price by using the historical volatility over the expected term of the options. The Company bases the risk-free interest rate on U.S. Treasury zero coupon issues with terms similar to the expected term of the options as of the date of grant. The Company does not anticipate paying any cash dividends in the foreseeable future, and therefore, uses an expected dividend yield of zero in the option valuation model. Stock-based compensation expense related to the ESPP and options is recognized on a straight-line basis over its respective term. Intangible and Long-Lived Assets Intangible assets consist of purchased developed technology and trademarks that are accounted for as definite-lived intangible assets subject to amortization. The Company determines the fair value of acquired intangible assets as of the acquisition date. Discounted cash flow models are typically used in these valuations, which require the use of significant estimates and assumptions, including but not limited to, developing appropriate discount rates and estimating future cash flows from product sales and related expenses. The fair value recorded is amortized on a straight-line basis over the estimated useful life of the asset. The Company estimated the useful life of the assets by considering competition by products prescribed for the same indication, the likelihood and estimated future entry of non-generic and generic competition for the same or similar indication and other related factors. The Company evaluates purchased intangibles for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. An impairment loss would be recognized when estimated undiscounted future cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. The impairment loss is calculated as the excess of the carrying amount over the fair value. Estimating future cash flows and fair value related to an intangible asset involves significant estimates and assumptions. If the Company’s assumptions are not correct, there could be an impairment loss or, in the case of a change in the estimated useful life of the asset, a change in amortization expense. The Company assess the recoverability of our long-lived assets, which include property and equipment and product rights whenever significant events or changes in circumstances indicate impairment may have occurred. If indicators of impairment exist, projected future undiscounted cash flows associated with the asset are compared to the carrying amount to determine whether the asset’s value is recoverable. Any resulting impairment is recorded as a reduction in the carrying value of the related asset and a charge to operating results. Goodwill Under the purchase method of accounting pursuant to ASC 805, Goodwill is calculated as the excess of the purchase price over the fair value of the assets acquired and liabilities assumed. Goodwill, which is not tax-deductible, is recognized within other long-term assets, and is not amortized but subject to an annual review for impairment. Goodwill is tested for impairment at the reporting unit level at least annually or when a triggering event occurs that could indicate a potential impairment by assessing qualitative factors or performing a quantitative analysis in determining whether it is more likely than not that the fair value of net assets are below their carrying amounts. A reporting unit is the same as, or one level below, an operating segment. The Company’s operations are currently comprised of a single reporting unit. Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13 Financial Instruments-Credit Losses (ASU 2016-13 or Topic 326): Measurement of Credit Losses on Financial Instruments, which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss methodology, which will result in more timely recognition of credit losses. The Company adopted this standard on January 1, 2020 and updated its internal controls to include certain forward-looking considerations in the current process of developing and recognizing credit losses for in scope financial assets, which primarily included accounts receivable and a $3.5 million investment in a company engaged in medical research. ASC 326 had an immaterial impact to our allowance for credit losses reported in accounts receivable on our Condensed Consolidated Balance Sheet upon adoption. The investment is structured as a long-term loan receivable with a convertible feature and carried at amortized cost with accruing interest. To calculate the expected credit loss allowance, the Company utilized a probability-of-default method (PDM). This process estimates the probability of the loan being successfully paid back or converted into equity based on the ability of the investee to obtain FDA acceptance of its research. As of September 30, 2020, the Company estimated an expected credit loss of approximately $1.9 million, which was recognized in Other (expense) income in the Company’s Condensed Consolidated Statement of Comprehensive Income in the first quarter of 2020 and is included in Investments, net in the Company’s Condensed Consolidated Balance Sheet. The Company’s expected credit losses can vary from period to period based on several factors, such as progress of the medical research and FDA submission, and overall economic environment and the ability of the investee to fund its operations. The primary factor that contributed to the provision for expected credit losses as of the second quarter of 2020 was an evaluation of probability of default to exist based on the outlook of the macro environment due to the COVID-19 pandemic and its impact to delay the FDA acceptance process combined with the investee’s ability to fund its operations and raise capital if required. In June 2018, the FASB issued ASU 2018-18 Collaborative Arrangements (ASU 2018-18), which clarifies the interaction between ASC 808, Collaborative Arrangements (ASC 808) and ASC 606, Revenue from Contracts with Customers (ASC 606). The update clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. In addition, the update precludes an entity from presenting consideration from a transaction in a collaborative arrangement as revenue if the counterparty is not a customer for that transaction. The Company adopted the standard as of January 1, 2020 and have applied modified retrospective transition method to the date of initial application of ASC 606. The adoption of this guidance did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Accounting for Cloud Computing Arrangements (Subtopic 350-40), which provides new guidance on the accounting for implementation, set-up, and other upfront costs incurred in a hosted cloud computing arrangement. Under the new guidance, entities will apply the same criteria for capitalizing implementation costs as they would for an internal-use software license arrangement. Effective January 1, 2020, the Company adopted the standard using the prospective approach to eligible costs incurred on or after the date of adoption. The adoption of this guidance did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018-13 Fair Value Measurement Disclosure Framework (ASU 2018-03), which is part of a broader disclosure framework project by the FASB to improve the effectiveness of disclosures by more clearly communicating the information to the user. The Company adopted the standard as of January 1, 2020 and included these disclosures in the condensed consolidated financial statements. The additional elements of this release did not impact the Company's condensed consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (ASU 2019-12): Simplifying the Accounting for Income Taxes |