Summary of Significant Accounting Policies | Summary of Significant Accounting Policies Basis of Presentation The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with the requirements of the U.S. Securities and Exchange Commission (SEC) for interim financial information. As permitted under Generally Accepted Accounting Principles in the United States (U.S. GAAP), certain notes and other information have been omitted from the interim unaudited condensed consolidated financial statements presented in this Quarterly Report on Form 10-Q. Therefore, these financial statements should be read in conjunction with the Company’s most recent Annual Report on Form 10-K, for the year ended December 31, 2019, filed with the SEC. In management’s opinion, the condensed consolidated financial statements include all normal and recurring adjustments necessary for a fair presentation of the Company’s financial position, results of operations, and cash flows. The results of operations for any interim period are not necessarily indicative of the Company’s future quarterly or annual results. The Company, which is primarily located in the United States (U.S.), operates in one operating segment. Reclassifications Certain prior year amounts in the condensed consolidated statements of earnings have been reclassified to conform to the current year presentation, including a reclassification made to separately present amortization of intangible assets. This was previously included in Selling, general and administrative expenses , and now is recorded as a component of Amortization of intangible assets on the condensed consolidated statements of earnings. These reclassifications had no effect on operating earnings or on our other condensed consolidated financial statements for the three and nine months ended September 30, 2020 and 2019. Consolidation The Company’s condensed consolidated financial statements include the accounts of: Supernus Pharmaceuticals, Inc.; Supernus Europe Ltd.; Biscayne Neurotherapeutics, Inc. and its wholly owned subsidiary; MDD US Enterprises, LLC (formerly USWM Enterprises, LLC); and MDD US Enterprises, LLC's wholly owned subsidiaries. These are collectively referred to herein as “Supernus” or “the Company.” All significant intercompany transactions and balances have been eliminated in consolidation. The condensed consolidated financial statements reflect the consolidation of entities in which the Company has a controlling financial interest. In determining whether there is a controlling financial interest, the Company considers if it has a majority of the voting interests of the entity, or if the entity is a variable interest entity (VIE) and if the Company is the primary beneficiary. In determining the primary beneficiary of a VIE, the Company evaluates whether it has both: the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; and the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to that VIE. The Company's judgment with respect to its level of influence or control of an entity involves the consideration of various factors, including: the form of ownership interest; representation in the entity’s governance; the size of the investment; estimates of future cash flows; the ability to participate in policy making decisions; and the rights of the other investors to participate in the decision making process, including the right to liquidate the entity, if applicable. If the Company is not the primary beneficiary of the VIE, and an ownership interest is maintained in the entity, the interest is accounted for under the equity or cost methods of accounting, as appropriate. The Company continuously assesses whether it is the primary beneficiary of a VIE, as changes to existing relationships or future transactions may affect its conclusions. Use of Estimates The Company bases its estimates on: historical experience; forecasts; information received from its service providers; information from other sources, including public and proprietary sources; and other assumptions that the Company believes are reasonable under the circumstances. Actual results could differ materially from the Company’s estimates. The Company periodically evaluates the methodologies employed in making its estimates. Business Combinations and Contingent Considerations To determine whether an acquisition should be accounted for as a business combination or as an asset acquisition, the Company makes certain judgments regarding whether the acquired set of activities and assets meets the definition of a business. Significant judgment is required in assessing whether the acquired processes or activities, along with their inputs, would be substantive so as to constitute a business, as defined by U.S. GAAP. If the acquired set of activities and assets meets the definition of a business, the Company applies the acquisition method of accounting to that transaction. Otherwise, the transaction is recorded as an asset acquisition rather than a business combination. In an asset acquisition, any acquired in-process research and development (IPR&D) that does not have an alternative future use is charged to expense as of the acquisition date, and no goodwill is recorded. Under the acquisition method of accounting, assets acquired and liabilities assumed are recorded at their respective fair values as of the acquisition date. The excess of the purchase price over the fair value of the acquired net assets, if applicable, is recorded as goodwill. The operating results of the acquired business are included in the Company’s condensed consolidated statement of earnings, beginning on the effective acquisition date. Acquisition-related expenses are recognized separately from the business combination, and are expensed as incurred. Significant judgment is involved in the determination of the fair value assigned to assets acquired and liabilities assumed in a business combination, as well as the estimated useful lives of assets. These estimates can materially affect our consolidated results of operations. The fair value of intangible assets, including acquired IPR&D, are determined using information available as of the acquisition date, and are based on estimates and assumptions that are deemed reasonable by management. Significant estimates and assumptions include, but are not limited to: probability of technical success; revenue growth; and appropriate discount rate. Depending on the facts and circumstances, the Company may deem it necessary to engage an independent valuation expert to assist in valuing significant assets and liabilities. While the Company uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed as of the acquisition date, estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Uncertain tax positions and tax-related valuation allowances are initially recorded in connection with a business combination as of the acquisition date. The Company continues to collect information and evaluate these estimates and assumptions on a quarterly basis. The Company records any adjustments to the Company’s preliminary estimates to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to our condensed consolidated statements of earnings in the period that these adjustments are identified. Contingent Considerations Certain of the Company’s business combinations involve the potential for future payments that are contingent upon the achievement of certain milestones related to the development or commercial sale of its products, including product development milestones or royalty payments on future product sales. The fair value of these contingent consideration liabilities is determined as of the acquisition date using estimated or forecast inputs. These inputs include: the estimated amount and timing of projected cash flows; volatility of projected cash flows; the probability of milestone achievement (i.e., achievement of the contingent event); and the estimated discount rates and risk-free rate used to present value the probability-weighted cash flows. Subsequent to the acquisition date, at each reporting period prior to resolution of the contingency, the contingent consideration liability is remeasured at current fair value, with changes recorded in earnings in the period of remeasurement. Similarly, the determination of the initial and subsequent fair value of the contingent consideration liability requires significant judgment by management. Changes in any of the inputs may result in a significantly different fair value adjustment, which can impact the results of operations in the period in which the adjustment is made. These changes are reported on the condensed consolidated statement of earnings in Selling, general and administrative expenses . Additional information regarding the Company's recent business combination and its assessment of contingent consideration is included in Note 3, USWM Acquisition . Revenue from Product Sales The Company’s customers are primarily pharmaceutical wholesalers, specialty pharmacies, and pharmaceutical distributors. Customers purchase product to fulfill orders from retail pharmacy chains and independent pharmacies of varying size and purchasing power. The Company recognizes gross revenue when its products are shipped from a third party fulfillment center and physically received by its customers. The Company's customers take control of its products, including title and ownership, upon physical receipt of its products at their facilities. Customer orders are generally fulfilled within a few days of order receipt, resulting in minimal order backlog. The Company does not adjust revenue for any financing effects as the Company expects the period between the transfer of the goods and collection of payment to be less than one year. There are no minimum product purchase requirements with our customers. The Company recognizes revenue from product sales in an amount that reflects the consideration the Company expects to ultimately receive in exchange for those goods. Product sales are recorded net of various forms of variable consideration, including: provision for estimated rebates; provision for estimated future product returns; and an estimated provision for discounts. These are collectively considered "sales deductions." As described below, variability in the net transaction price for the Company’s products arises primarily from the aforementioned sales deductions. Significant judgment is required in estimating certain sales deductions. In making these estimates, the Company considers: historical experience; product price increases; current contractual arrangements under applicable payor programs; unbilled claims; processing time lags for claims; inventory levels in the wholesale, specialty pharmacy, and retail distribution channel; and product life cycle. The Company adjusts its estimates of revenue either when the most likely amount of consideration it expects to receive changes, or when the consideration becomes fixed. Variable consideration on product sales is only recognized when it is probable that a significant reversal will not occur. If actual results in the future vary from our estimates, the Company adjusts its estimates in that calendar period. These adjustments could materially affect net product sales and earnings in the period in which the adjustment(s) is recorded. Sales Deductions The Company records product sales net of the following sales deductions: • Rebates: Rebates are discounts which the Company pays under either public sector or private sector health care programs. Rebates paid under public sector programs are generally mandated under law, whereas private sector rebates are generally contractually negotiated by the Company with managed care providers. Both types of rebates vary over time. Public sector rebate programs encompass: various Medicaid drug rebate programs; Medicare gap coverage programs; programs covering public health service institutions; and programs covering government entities. All federal employees and agencies purchase drugs under the Federal Supply Schedule. Private sector rebate programs include: contractual agreements with managed care providers, under which the Company pays fees to gain access to that provider’s patient drug formulary; and Company-sponsored programs, under which the Company defrays or eliminates patient co-payment charges that the patient would otherwise be obligated to pay to their managed care provider in order to fill their prescription. Rebates are owed upon dispensing our product to a patient; i.e., filling a prescription. The accrual balance for rebates consists of the following three components. First, because rebates are generally invoiced and paid quarterly in arrears, the accrual balance consists of an estimate of the amount expected to be incurred for prescriptions dispensed in the current quarter. Second, the accrual balance also includes an estimate for known or estimated prior quarters’ unpaid rebates, covering those prescriptions dispensed in past quarters but for which no invoice has yet been received. Third, the accrual balance includes an estimate for rebates that will be prospectively owed for prescriptions filled in future quarters. This estimate pertains to product that has been sold by the Company to wholesalers or distributors, and which resides either as wholesaler/distributor inventory or as inventory held at pharmacies. As of the end of the reporting period, this product has not been dispensed to a patient. The Company’s estimates of expected rebate claims vary by program and by type of customer because the period between the date at which the prescription is filled and the date at which the Company receives and pays the invoice varies substantially. For each of its products, the Company bases its estimates of expected rebate claims on multiple factors, including: historical levels of deductions; contractual terms with managed care providers; actual and anticipated changes in product price; prospective changes in managed care fee for service contracts; prospective changes in co-payment assistance programs; and anticipated changes in program utilization rates; i.e., patient participation rates under each specific program. The Company records an estimated liability for rebates at the time the customer takes title to the product (i.e., at the time of sale to wholesalers/distributors). This liability is recorded as a reduction to gross product sales, and an increase in Accrued product returns and rebates. The liability is recorded as a component of current liabilities on the condensed consolidated balance sheets. The sensitivity of the Company’s estimates to subsequent adjustment varies by program and by type of customer. If actual rebates vary from estimated amounts, the Company will adjust the balances of such accrued rebates to reflect actual experience. These adjustments could materially affect the estimated liability balance, net product sales, and earnings in the period in which the adjustment(s) is made. • Returns : Sales of the Company’s products are not subject to a general right of return. Product that has been used to fill patient prescriptions is no longer subject to any right of return. However, the Company will accept return of product that is damaged or defective when shipped from its third party fulfillment center. The Company will also accept return of expired product six months prior to and up to 12 months subsequent to the product’s expiry date. Expired or defective returned product cannot be re-sold, and is therefore destroyed. The Company records an estimated liability for product returns at the time the customer takes title to the product (i.e., at time of sale). The liability is reflected as a reduction to gross product sales, and an increase in Accrued product returns and rebates. This liability is recorded as a component of current liabilities on the condensed consolidated balance sheets. The Company estimates the liability for returns primarily based on the actual returns experience for its five commercial products. Because the Company’s products have a shelf life up to 60 months from date of manufacture, and because the Company accepts return of product up to 12 months post its expiry date, there is a time lag of several years between the time when the product is sold and the time when the Company issues credit on expired product. The Company’s returns policy generally permits product returns to be processed at current wholesaler price rather than at historical acquisition price; hence, the Company’s estimated liability for product returns is affected by price increases taken subsequent to the date of sale and prior to its return. At the time the Company adjusts its estimates for product returns, such adjustment affects the estimated liability, product sales and earnings in the period of adjustment. Those adjustments may be material to our financial results. • Sales discounts : Distributors and wholesalers of the Company's pharmaceutical products are generally offered various forms of consideration, including allowances, service fees and prompt payment discounts, for distributing our products. Distributor and wholesaler allowances and service fees arise from contractual agreements, and are estimated as a percentage of the price at which the Company sells product to them. In addition, distributors and wholesalers are offered a prompt pay discount for payment within a specified period. Prompt pay discounts are estimated as a percentage of the price at which the Company sells product. The Company accounts for these discounts at the time of sale, as a reduction to gross product sales, and records these discounts as a valuation allowance against Accounts receivable on the condensed consolidated balance sheets. Royalty Revenues The Company recognizes noncash royalty revenue for amounts earned pursuant to its royalty agreement with United Therapeutics Corporation (United Therapeutics), based on estimated product sales of Orenitram by United Therapeutics (see Note 4). This agreement includes the right to use the Company’s intellectual property as a functional license. In 2014, the Company sold certain of these royalty rights to Healthcare Royalty Partners III, L.P. (HC Royalty) (see Note 19). Consequent to this agreement, the Company recorded a nonrecourse liability related to this transaction, and amortizes this liability as noncash royalty revenue. Sales of Orenitram by United Therapeutics result in payments from United Therapeutics to HC Royalty, in accordance with this agreement. The Company also recognizes noncash interest expense related to the nonrecourse liability and accrues interest expense at an estimated effective interest rate (see Note 18). This interest rate is determined based on projections of HC Royalty’s rate of return. Royalty revenue also includes cash royalty amounts received from other collaboration partners, including from Takeda Pharmaceutical Company Ltd, based on net product sales of Takeda's product, Mydayis, in the current period. Royalty revenue is only recognized when the underlying product sale by Takeda has occurred. The Takeda arrangement also includes Takeda's right to use the Company’s intellectual property as a functional license. There are no guaranteed minimum amounts owed to the Company related to any of these royalty revenue agreements. Research and Development Expenses and Related Accrued Research and Development Expenses Research and development expenditures are expensed as incurred. These expenses include: employee salaries, benefits, and share-based compensation; cost of contract research and development services provided by third parties; costs for conducting preclinical and clinical studies; cost of acquiring or manufacturing clinical trial materials; regulatory costs; research facilities costs; depreciation expense and allocated occupancy expenses; and license fees and milestone payments related to in-licensed products and technologies. Assets that are used for research and development and that have no future alternative use are expensed as incurred in-process research and development. The Company estimates preclinical and clinical trial expenses based on services performed pursuant to contracts with research institutions, clinical investigators, clinical research organizations (CROs) and other service providers that work on the Company’s behalf. In recording service fees, the Company estimates the cost of those services which have been performed on behalf of the Company during the current period, and compares those costs with the cumulative expenses recorded and cumulative payments made, for such services. As appropriate, the Company accrues additional expense for services that have been delivered, or defers nonrefundable advance payments until the related services are performed. If the actual timing of the performance of services or the level of effort varies from our estimate, the Company adjusts its accrued expenses or its deferred advance payments, accordingly. If the Company subsequently determines that it no longer expects the services associated with a nonrefundable advance payment to be rendered, the remaining portion of that advance payment is charged to expense in the period in which such a determination is made. Marketable Securities Marketable securities consist of investments in: U.S. Treasury bills and notes; bank certificates of deposit; various U.S. governmental agency debt securities; corporate and municipal debt securities; and other fixed income securities. The Company places all investments with governmental, industrial, or financial institutions whose debt is rated as investment grade. The Company's investments are classified as available-for-sale and are carried at fair value. The Company classifies all available-for-sale marketable securities with maturities greater than one year from the balance sheet date as non-current assets. Any unrealized holding gains or losses on debt securities are reported, net of any tax effects, as a component of other comprehensive earnings (loss) in the condensed consolidated statement of comprehensive earnings. Realized gains and losses, included in Other income (expense), net in the condensed consolidated statement of earnings, are determined using the specific identification method for determining the cost of securities sold. The Company adopted Accounting Standards Update (ASU) No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020, using the allowance approach. Declines in fair value below amortized cost related to credit losses (i.e., impairment due to credit losses), are included in the condensed consolidated statement of earnings, with a corresponding allowance established. If the estimate of expected credit losses decreases in subsequent periods, the Company will reverse the credit losses through current period earnings, and accordingly adjust the allowance (see Recently Issued Accounting Pronouncements). Inventories Inventories, which are recorded at the lower of cost or net realizable value, include materials, labor, direct costs and indirect costs. These are valued using the first-in, first-out method. The Company writes down inventory that has become obsolete, or has a cost basis in excess of its expected net realizable value. Expired inventory is destroyed, and the related costs are recognized as Cost of goods sold in the condensed consolidated statement of earnings. Inventories Produced in Preparation of Product Launches The Company capitalizes inventories produced in preparation for product launches when future commercialization of a product is probable, and when a future economic benefit is expected to be realized. The determination to capitalize is based on the particular facts and circumstances relating to the product. Capitalization of such inventory begins when the Company determines that (i) positive clinical trial results have been obtained in order to support regulatory approval; (ii) uncertainties regarding regulatory approval have been significantly reduced; and (iii) it is probable that these capitalized costs will provide future economic benefit, in excess of capitalized costs. In evaluating whether these conditions are met, the Company considers the following factors: the product candidate’s current status in the regulatory approval process; results from the related pivotal and supportive clinical trials; results from meetings with relevant regulatory agencies prior to the filing of regulatory applications; completion of the regulatory applications; consequent acceptance by the regulatory agency; potential impediments to the approval process, such as product safety or efficacy concerns, potential labeling restrictions, and other impediments; historical experience with manufacturing and commercializing similar products as well as manufacture of the relevant product candidate; and the resilience of the Company’s manufacturing environment, and supply chain, in determining logistical constraints that could hamper approval or commercialization. In assessing the economic benefit that the Company is likely to realize, the Company considers: the shelf life of the product in relation to the expected timeline for approval; patent related or contractual issues that may prevent or delay commercialization; product stability data of all pre-approval production to assess adequacy of expected shelf life; viability of commercialization, taking into account competitive dynamics in the marketplace and market acceptance; anticipated future sales; and anticipated reimbursement strategies that may prevail with respect to the product, to determine product profit margin. In applying the lower of cost or net realizable value to pre-launch inventory, the Company estimates a range of likely commercial prices based on pricing of competitive commercial products, and pre-launch discussions with managed care providers. The Company could be required to write down previously capitalized costs related to pre-launch inventories upon a change in facts and circumstances, including among other potential factors, a denial or significant delay of approval by regulatory bodies, a delay in commercialization, or other adverse factors. Intangible Assets Intangible assets consist of definite-lived intangible assets, including: acquired developed technology; product rights; and patent defense costs. They also consist of indefinite-lived intangible assets, such as acquired IPR&D. Patent defense costs are legal fees that have been incurred in connection with legal proceedings related to the defense of patents for Oxtellar XR and Trokendi XR. Patent defense costs are charged to expense in the event of an unsuccessful litigation outcome. Definite-lived intangible assets are carried at cost less accumulated amortization, with amortization calculated on a straight line basis over the estimated useful lives of the assets. The Company evaluates the estimated remaining useful life of its intangible assets annually, or when events or changes in circumstances warrant a revision to the remaining periods of amortization. Indefinite-lived intangible assets are not amortized but are tested for impairment annually. Acquired IPR&D in a business combination is considered to be an indefinite-lived asset until the completion or abandonment of the associated research and development efforts. Upon successful completion of the project, the Company will make a determination as to the then-useful life of the intangible asset. This is generally determined by the period over which the substantial majority of the cash flows are expected to be generated. The capitalized amount is then amortized over its estimated useful life. If a project is abandoned, all remaining capitalized amounts are written off immediately. During the period prior to completion or abandonment, the IPR&D asset will not be amortized but will be tested for impairment on an annual basis or when potential indicators of impairment are identified. Goodwill and Goodwill Impairment Assessment Goodwill is calculated as the excess of the consideration paid consequent to completing an acquisition compared to the net assets recognized in a business combination. Goodwill represents the future economic benefits arising from the other acquired assets that could not be individually identified and separately quantified. The Company evaluates goodwill for possible impairment at least annually (during the fourth quarter of each fiscal year), or more often, if and when circumstances indicate that goodwill may be impaired. This includes but is not limited to significant adverse changes in the business climate, market conditions, or other events that indicate that it is more likely than not that the fair value of the reporting unit is less than its carrying value. In performing its goodwill assessment, the Company first performs a qualitative test. If necessary, the Company then performs a quantitative test. To conduct the quantitative impairment test of goodwill, the Company compares the fair value of a reporting unit to its carrying value. Evaluating for impairment requires judgment, including estimating future cashflows. The Company estimates the fair values of its reporting unit using discounted cash flow models or other valuation models, such as comparative transactions or market multiples. If the reporting unit’s carrying value exceeds its fair value, the Company records an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value. Impairment of Long Lived Assets Long-lived assets consist primarily of property and equipment, operating lease assets and intangible assets. The carrying value of intangible assets is assessed for impairment annually (during the fourth quarter of each year), or more frequently if impairment indicators exist. Impairment indicators include but are not limited to adverse changes in circumstances, or other events that indicate that the carrying amount of an asset may not be recoverable. Evaluating for impairment requires judgment, including estimating future cash flows, future growth rates, future profitability, and the expected life over which projected cash flows will occur. For IPR&D assets, the Company also considers various factors and risks for potential impairment, including the current legal and regulatory environment, and the competitive landscape. Adverse clinical trial results, significant trial delays, inability to obtain governmental approval, inability to commercialize a product candidate, and the introduction or advancement of competitive products and product candidates, could result in partial or full impairment of the related intangible asset. In these circumstances, the eventual realized value of the IPR&D asset may vary from its fair value as of the date of acquisition, and impairment charges may be recorded in future periods. Changes in the Company's business strategy or adverse changes in market conditions could likewise adversely affect impairment analyses. If indications of impairment exist, projected future undiscounted cash flows associated with the asset would be compared to the carrying value of the asset, to determine whether the asset's value is recoverable. If impairment is determined, the Company writes down the asset to its estimated fair value; i.e., the Company recognizes an impairment charge equal to the excess of the carrying value of the long-lived asset over its estimated fair value, as of the time at which such a determination is made. Share-Based Compensation Stock Options The Company recognizes share-based compensation expense over the service period, using the straight-line method. Employee share-based compensation for stock options is determined using the Black-Scholes option-pricing model to compute the fair value of option grants as of their grant date. Forfeitures are accounted for as incurred. The Company uses the following assumptions for estimating the fair value of option grants: Fair Value of Common Stock —The fair value of the common stock underlying the option grants is determined based on observable market prices of the Company’s common stock. Expected Volatility —Volati |