Supernus Pharmaceuticals (SUPN) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-35518
Entity Registrant Name	SUPERNUS PHARMACEUTICALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-2590184
Entity Address, Address Line One	9715 Key West Avenue
Entity Address, City or Town	Rockville
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20850
City Area Code	301
Local Phone Number	838-2500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.001 par value per share
Entity Common Stock, Shares Outstanding		53,018,637
Trading Symbol	SUPN
Security Exchange Name	NASDAQ
Entity Central Index Key	0001356576
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 255,642	$ 288,640
Marketable securities	135,459	133,893
Accounts receivable, net	127,065	140,877
Inventories, net	50,226	48,325
Prepaid expenses and other current assets	17,631	18,682
Total current assets	586,023	630,417
Long term marketable securities	416,566	350,359
Property and equipment, net	37,950	37,824
Intangible assets, net	358,736	364,342
Goodwill	77,911	77,911
Other assets	30,257	43,249
Total assets	1,507,443	1,504,102
Current liabilities
Accounts payable and accrued liabilities	70,099	78,934
Accrued product returns and rebates	128,736	126,192
Contingent consideration, current portion	31,520	30,900
Other current liabilities	10,457	9,082
Total current liabilities	240,812	245,108
Convertible notes, net	366,038	361,751
Contingent consideration, long term	46,200	45,800
Operating lease liabilities, long term	28,532	28,579
Deferred income tax liabilities	31,742	35,215
Other liabilities	39,675	42,791
Total liabilities	752,999	759,244
Stockholders’ equity
Common stock, $0.001 par value; 130,000,000 shares authorized; 52,994,137 and 52,868,482 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	53	53
Additional paid-in capital	415,950	409,332
Accumulated other comprehensive earnings, net of tax	6,249	8,975
Retained earnings	332,192	326,498
Total stockholders’ equity	754,444	744,858
Total liabilities and stockholders’ equity	$ 1,507,443	$ 1,504,102

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Stockholders’ equity
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock shares authorized (in shares)	130,000,000	130,000,000
Common stock shares issued (in shares)	52,994,137	52,994,137
Common stock shares outstanding (in shares)	52,868,482	52,868,482

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenues
Total revenues		$ 130,932	$ 94,976
Costs and expenses
Cost of goods sold	[1]	14,954	4,152
Research and development		34,280	18,937
Selling, general and administrative		61,457	41,614
Amortization of intangible assets		6,007	1,261
Contingent consideration expense		1,020	0
Total costs and expenses		117,718	65,964
Operating earnings		13,214	29,012
Other income (expense)
Interest expense		(6,097)	(5,755)
Interest and other income, net		3,812	5,777
Total other income (expense)		(2,285)	22
Earnings before income taxes		10,929	29,034
Income tax expense		5,235	7,516
Net earnings		$ 5,694	$ 21,518
Earnings per share
Basic (in dollars per share)		$ 0.11	$ 0.41
Diluted (in dollars per share)		$ 0.11	$ 0.40
Weighted-average shares outstanding
Basic (in shares)		52,927,467	52,534,787
Diluted (in shares)		54,196,971	53,581,051
Net product sales
Revenues
Total revenues		$ 128,381	$ 92,490
Royalty revenues
Revenues
Total revenues		$ 2,551	$ 2,486
[1]	Excludes amortization of acquired intangible assets

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 5,694	$ 21,518
Other comprehensive earnings
Unrealized loss on marketable securities, net of tax	(2,726)	(7,583)
Other comprehensive loss	(2,726)	(7,583)
Comprehensive earnings	$ 2,968	$ 13,935

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Stockholder's Equity - USD ($) $ in Thousands	Total	Common Stock	Additional  Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Retained Earnings
Balance (in shares) at Dec. 31, 2019		52,533,348
Balance at Dec. 31, 2019	$ 595,428	$ 53	$ 388,410	$ 7,417	$ 199,548
Increase (Decrease) in Stockholders' Equity
Share-based compensation	3,988		3,988
Issuance of common stock in connection with the Company’s equity award plans (in shares)		3,811
Issuance of common stock in connection with the Company’s equity award plans	32		32
Net earnings	21,518				21,518
Unrealized loss on marketable securities, net of tax	(7,583)			(7,583)
Balance (in shares) at Mar. 31, 2020		52,537,159
Balance at Mar. 31, 2020	613,383	$ 53	392,430	(166)	221,066
Balance (in shares) at Dec. 31, 2020		52,868,482
Balance at Dec. 31, 2020	744,858	$ 53	409,332	8,975	326,498
Increase (Decrease) in Stockholders' Equity
Share-based compensation	4,371		4,371
Issuance of common stock in connection with the Company’s equity award plans (in shares)		125,655
Issuance of common stock in connection with the Company’s equity award plans	2,247		2,247
Net earnings	5,694				5,694
Unrealized loss on marketable securities, net of tax	(2,726)			(2,726)
Balance (in shares) at Mar. 31, 2021		52,994,137
Balance at Mar. 31, 2021	$ 754,444	$ 53	$ 415,950	$ 6,249	$ 332,192

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net earnings	$ 5,694	$ 21,518
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	6,592	1,732
Navitor investment R&D expense	15,000	0
Amortization of deferred financing costs and debt discount	4,287	4,061
Realized gains from sales of marketable securities	(216)	(202)
Amortization of premium/discount on marketable securities	(1,706)	(249)
Change in fair value of contingent consideration	1,020	0
Other noncash adjustments, net	(1,202)	790
Share-based compensation expense	4,371	3,988
Deferred income tax provision	(2,565)	538
Changes in operating assets and liabilities:
Accounts receivable	13,805	(31,823)
Inventories	(1,048)	2,210
Prepaid expenses and other assets	(368)	(454)
Accrued product returns and rebates	2,544	11,824
Accounts payable and other liabilities	(10,008)	(5,017)
Net cash provided by operating activities	36,200	8,916
Cash flows from investing activities
Purchases of marketable securities	(119,063)	(15,382)
Sales and maturities of marketable securities	49,579	53,357
Purchases of property and equipment	(1,508)	(2,537)
Deferred legal fees	(453)	0
Net cash (used in) provided by investing activities	(71,445)	35,438
Cash flows from financing activities
Proceeds from issuance of common stock	2,247	32
Net cash provided by financing activities	2,247	32
Net change in cash and cash equivalents	(32,998)	44,386
Cash and cash equivalents at beginning of year	288,640	181,381
Cash and cash equivalents at end of period	255,642	225,767
Supplemental cash flow information
Cash paid for interest on convertible notes	1,258	1,258
Cash paid for income taxes	301	324
Cash paid for operating leases	1,834	1,261
Noncash investing and financing activities
Lease assets and tenant receivable obtained for new leases	1,432	1,715
Deferred legal fees and fixed assets included in accounts payable and accrued expenses	$ 160	$ 708

Business Organization

Business Organization	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Organization	Business Organization Supernus Pharmaceuticals, Inc. (the Company) is a biopharmaceutical company focused on developing and commercializing products for the treatment of central nervous system (CNS) diseases. The Company's diverse neuroscience portfolio includes approved treatments for epilepsy, migraine, attention-deficit hyperactivity disorder (ADHD), hypomobility in Parkinson’s Disease (PD), cervical dystonia, and chronic sialorrhea. The Company is developing a broad range of novel CNS product candidates including new potential treatments for ADHD, hypomobility in PD, epilepsy, depression, and rare CNS disorders. The Company has a portfolio of commercial products and product candidates. Commercial Products • Trokendi XR ® (topiramate) is the first once-daily extended release topiramate product indicated for the treatment of epilepsy in the United States (U.S.) market. It is also indicated for the prophylaxis of migraine headache. • Oxtellar XR ® (oxcarbazepine) is indicated as therapy for partial onset seizures in adults and children 6 years to 17 years of age and is the first once-daily extended-release oxcarbazepine product indicated for the treatment of epilepsy in the U.S. • Qelbree TM (viloxazine extended-release capsules) is a novel non-stimulant product indicated for the treatment of ADHD in pediatric patients 6 to 17 years of age. • APOKYN ® (apomorphine hydrochloride injection) is a product indicated for the acute, intermittent treatment of hypomobility or "off" episodes ("end-of-dose wearing off" and unpredictable "on-off" episodes) in patients with advanced PD. • MYOBLOC ® (rimabotulinumtoxinB) is a product indicated for the treatment of cervical dystonia and sialorrhea in adults, and it is the only Type B toxin available on the market. • XADAGO ® (safinamide) is a once-daily product indicated as adjunctive treatment to levodopa/carbidopa in patients with PD experiencing "off" episodes. Product Candidates • SPN-812 (viloxazine hydrochloride) is a novel non-stimulant product candidate for the treatment of ADHD in adult patients. • SPN-830 (Apomorphine Infusion Pump) is a late-stage drug/device combination product candidate for the continuous prevention of "off" episodes in PD. • SPN-817 is a novel product candidate for the treatment of severe epilepsy. • SPN-820 is a first-in-class product candidate for treatment resistant depression (TRD). It is an orally active small molecule that directly activates brain mechanistic target of rapamycin complex 1 (mTORC1). In April 2021, the U.S. Food and Drug Administration (FDA) approved Qelbree for the treatment of ADHD in pediatric patients 6 to 17 years of age. The Company plans to make Qelbree available in the U.S. during the second quarter of 2021. On April 28, 2020, the Company entered into a Sale and Purchase Agreement with US WorldMeds Partners, LLC to acquire the CNS portfolio of USWM Enterprises, LLC (USWM Enterprises) (USWM Acquisition). With the acquisition, completed on June 9, 2020, the Company added three established commercial products, APOKYN, XADAGO, and MYOBLOC, and a product candidate in late-stage development, SPN-830, to its portfolio. Refer to Note 3, USWM Acquisition , for further discussion on the USWM Acquisition. On April 21, 2020, the Company entered into a Development and Option Agreement (Development Agreement) with Navitor Pharmaceuticals, Inc. (Navitor Inc.). Under the terms of the Development Agreement, the Company and Navitor Inc. will jointly conduct a Phase II clinical program for NV-5138 (SPN-820) in TRD. In addition to entering into the Development Agreement in April 2020, the Company acquired an ownership position in Navitor Inc. In March 2021, Navitor Inc. underwent a legal restructuring whereby Navitor Inc. became a wholly owned subsidiary of a newly formed limited liability company, Navitor Pharmaceuticals, LLC (Navitor LLC). Refer to Note 5, Investments , for further discussion on the Navitor Development Agreement and equity investment. COVID-19 Impact The Company is closely monitoring the impact of the COVID-19 pandemic on all aspects of its business operations, and has assessed the impact of the COVID-19 pandemic on its condensed consolidated financial statements as of March 31, 2021. Since the situation surrounding the COVID-19 pandemic remains fluid and the duration uncertain, the long-term nature and extent of the impacts of the pandemic on the Company's business operations and financial position cannot be reasonably estimated at this time.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
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 condensed consolidated 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, 2020, 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 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 is now 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 months ended March 31, 2021 and 2020. Consolidation The Company’s condensed consolidated financial statements include those of the Company's wholly-owned subsidiaries and variable interest entities (VIE) where the Company is the primary beneficiary, if any. All significant intercompany transactions and balances have been eliminated in consolidation. 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. The extent to which the COVID-19 pandemic may directly or indirectly impact our business, financial condition and results of operations is highly uncertain and subject to change. As a result, certain of our estimates and assumptions, including the provision for sales deductions, the creditworthiness of customers entering into revenue arrangements, the valuation of the assets and liabilities acquired in the USWM Acquisition, and the fair values of our financial instruments, require increased judgment and carry a higher degree of variability and volatility that could result in material changes to our estimates in future periods. Advertising Expense Advertising expense includes the cost of promotional materials and activities, such as printed materials and digital marketing, marketing programs and speaker programs. The cost of the Company's advertising efforts are expensed as incurred. The Company incurred approximately $15.3 million and $11.6 million in advertising expense for the three months ended March 31, 2021 and 2020, respectively. These expenses are recorded as a component of Selling, general and administrative expenses in the condensed consolidated statements of earnings. Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes - The new standard, issued in December 2019, simplifies the accounting for income taxes. The Company adopted the guidance on January 1, 2021, on a prospective basis. The adoption of the new standard did not have a material impact to the financial statements. ASU 2020-01, Investments — Equity Securities (Topic 321), Investments — Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815), Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 - The new standard, issued in January 2020, clarifies the interaction of the equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain contracts and purchased options accounted for under Topic 815. The amendment clarifies that an entity can elect to adopt the measurement alternative, which is if an entity identifies observable price changes in orderly transactions for the identical or a similar investment of the same issuer, it should measure the equity security at fair value as of the date that the observable transaction occurred before applying or upon discontinuing the equity method. The adoption of the new standard as of January 1, 2021 did not have a material impact to the financial statements. New Accounting Pronouncements Not Yet Adopted The Company is currently evaluating the impact of the new guidance on its consolidated financial statements. ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity

USWM Acquisition

USWM Acquisition	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
USWM Acquisition	USWM Acquisition On June 9, 2020 (the Closing Date), the Company completed its acquisition of all of the outstanding equity of USWM Enterprises, a privately-held biopharmaceutical company, pursuant to a Sale and Purchase Agreement with US WorldMeds Partners, LLC (Seller), dated April 28, 2020 (the Agreement). Under the terms of the Agreement, the Company acquired the right to further develop and commercialize APOKYN, XADAGO, and the Apomorphine Infusion Pump (SPN-830) in the U.S. and MYOBLOC worldwide (the Products) for an upfront cash payment of $297.2 million, subject to working capital adjustments, and the potential for additional contingent consideration payments of up to $230 million. The potential $230 million in contingent consideration payments includes up to $130 million for the achievement of certain SPN-830 regulatory and commercial activities (regulatory and developmental contingent consideration payments) and up to $100 million related to future sales performance of the Products (sales-based contingent consideration payments). The regulatory and developmental contingent consideration payments include a $25 million milestone due upon the FDA's acceptance of the SPN-830 New Drug Application (NDA) for review. The remaining $105 million of the $130 million contingent consideration payments include payments upon the FDA's regulatory approval and subsequent commercial launch of SPN-830, if approved. One of the regulatory milestones has a time-based mechanism for full or partial achievement. The $100 million sales-based contingent consideration payments include a $35 million milestone due upon achievement of certain U.S. net product sales of APOKYN during 2021. The remaining $65 million of the $100 million sales-based contingent consideration payments relate to the achievement of certain net product sales of the Products in 2022 and 2023. The Company's accounting for this acquisition is preliminary and fair value estimates for the assets acquired and liabilities assumed and the Company's estimates and assumptions are subject to change as the Company obtains additional information for its estimates during the measurement period. The Company expects to finalize its purchase price allocation within one year of the Closing Date. The Company continues to analyze and assess relevant information necessary to determine, recognize and record at fair value the assets acquired and liabilities assumed. Examples of areas that rely on preliminary estimates subject to measurement period adjustments include intangibles, lease asset and liability and deferred income tax assets and liabilities. The Company is in the process of obtaining additional market research that may inform the fair value of the acquired intangible assets and additional analysis that may be informative in the determination of the fair value of lease asset and other information. Accordingly, the preliminary recognition and measurement of assets acquired and liabilities assumed as of Closing Date are subject to change. Purchase Price Consideration As Initially Reported Measurement Period Adjustments As Adjusted Cash consideration $ 304,194 $ 1,341 $ 305,535 Estimated fair value of contingent consideration 115,700 (40,900) 74,800 Estimated total purchase consideration $ 419,894 $ (39,559) $ 380,335 Cash consideration to Seller - net of cash acquired (1) $ 297,200 $ 1,341 $ 298,541 ______________________________ (1) Represents total purchase price, less cash and cash equivalents acquired, and contingent consideration liabilities. Measurement period adjustment reflects additional payments made to Seller following the Closing date for working capital adjustments on the purchase price consistent with the Agreement. The Company paid the Seller $297.2 million in cash at the Closing Date. In the fourth quarter of 2020, the Company paid the Seller an additional $1.3 million for working capital adjustments on the purchase price consistent with the Agreement resulting in an increase to the original cash consideration paid to the Seller. Contingent Consideration In addition to the cash paid to the Seller, contingent payments of up to $230 million are also due to the Seller upon the achievement of certain milestones related to the development of SPN-830, the In Process Research and Development (IPR&D) asset, and sale of the Products. The possible outcomes for the contingent consideration range from $0, if no milestone is achieved, to $230 million on an undiscounted basis if all milestones are achieved. The Company initially recorded a contingent consideration liability of $115.7 million as of the Closing Date to reflect the estimated fair value of the contingent consideration based on information available at that time. Subsequent to the Closing Date, the Company adjusted the contingent consideration fair value based on new information related to the facts and circumstances that existed as of the acquisition date related to the timing of meeting the conditions of the milestone payments that are contingent upon regulatory approval and commercial launch of the acquired IPR&D asset as well as the estimated timing of projected revenues from the Products. As a result, the Company recorded in the fourth quarter of 2020, a measurement period adjustment of $40.9 million, which decreased the estimated fair value of the contingent consideration liability as of Closing Date to $74.8 million. Fair Value of Net Assets Acquired The following table presents the Company’s preliminary estimates of the fair value of the assets acquired and liabilities assumed as of the Closing Date, and subsequent measurement period adjustments recorded (dollars in thousands): As Initially Reported Measurement Period Adjustments As Adjusted Cash and cash equivalents $ 6,994 $ — $ 6,994 Accounts receivable 18,474 — 18,474 Inventories (1) 10,400 (700) 9,700 Prepaid expenses and other current assets 3,564 — 3,564 Property and equipment 454 — 454 Finance lease asset (2) 22,747 — 22,747 Intangible assets (1) 387,000 (32,000) 355,000 Other assets 340 — 340 Total fair value of assets acquired 449,973 (32,700) 417,273 Accounts payable (2,573) — (2,573) Accrued expenses and other current liabilities (23,339) — (23,339) Finance lease liability (2) (22,747) — (22,747) Deferred income tax liabilities, net (3) (69,515) 3,325 (66,190) Total fair value of liabilities assumed (118,174) 3,325 (114,849) Total identifiable net assets $ 331,799 $ (29,375) $ 302,424 Goodwill 88,095 (10,184) 77,911 Total purchase price (4) $ 419,894 $ (39,559) $ 380,335 ______________________________ (1) Measurement period adjustments to intangible assets and inventory are primarily due to updates to inputs and assumptions based on information related to the facts and circumstances that existed as of the acquisition date. (2) Refer to Note 12 for further discussion of the acquired finance lease asset and assumed lease liability. (3) Includes tax attributes that are subject to tax limitations. Measurement period adjustment is primarily due to the tax impact of the changes in the initial estimate of the fair value of intangible assets and inventories. (4) Measurement period adjustments include an adjustment to the fair value of the contingent consideration net of the additional cash payment made to the Seller. Acquired Intangible Assets The acquired intangible assets include the acquired IPR&D asset related to the Apomorphine Infusion Pump product candidate and the acquired developed technology and product rights. The Company determined the estimated fair value of the acquired intangible assets as of the Closing Date using the income approach. The fair value measurements of the acquired intangible assets were determined based on significant unobservable inputs and thus represent a Level 3 fair value measurement. Some of the more significant inputs and assumptions used in the intangible assets valuation includes: the timing and probability of success of clinical and regulatory approvals for the IPR&D asset, the estimated future cash flows from Product sales, the timing and projection of costs and expenses, discount rates and tax rates. The Company initially recorded a fair value of intangible assets of $387 million, which consisted of $150 million related to the acquired IPR&D and $237 million related to acquired developed technology and Product rights. The initial estimate of the fair value of intangible assets recorded as of the Closing Date is based on information available at that time. During the year ended December 31, 2020, the Company recorded measurement period adjustments of $32 million, which adjusted the initial estimated fair value of the intangible assets to $355 million as of the Closing Date. The Company updated assumptions with respect to the timing of regulatory approval and the commercialization of the acquired IPR&D asset. In addition, the Company also made refinements of the estimates of projected cash flows based on review of terms of the contractual arrangements associated with the acquired Products. The revisions were based on updated assumptions and information related to the facts and circumstances that existed as of the acquisition date. The following table summarizes the preliminary purchase price allocation, and the preliminary average remaining useful lives for identifiable intangible assets (dollars in thousands): Estimated Fair Value Estimated Useful Lives as of Closing Date Acquired In-process Research & Development $ 123,000 n/a Acquired Developed Technology and Product Rights 232,000 10.5 - 12.5 Total intangible assets $ 355,000 Acquired intangible assets, excluding the acquired IPR&D assets, are amortized over their estimated useful lives on a straight-line basis. IPR&D assets are considered indefinite-lived, until the successful completion or abandonment of the associated research and development efforts. Goodwill Goodwill was calculated as the excess of the consideration paid consequent to completing the acquisition, compared to the net assets recognized. Goodwill represents the future economic benefits from the other acquired assets, and which could not be individually identified and separately valued. Goodwill is primarily attributable to the additional acquired growth platforms and an expanded revenue base. Goodwill is not expected to be deductible for tax purposes. Pro forma Information The following table presents the unaudited pro forma combined financial information as if the USWM Acquisition had occurred on January 1, 2019 (dollars in thousands): Three Months ended March 31, 2020 Pro forma total revenues $ 133,162 Pro forma net earnings 21,314 The unaudited pro forma combined financial information is based on historical financial information as well as the Company's preliminary allocation of the purchase price; therefore, it is subject to subsequent adjustment upon finalization of the purchase price allocation. In order to reflect the occurrence of the acquisition as if it occurred on January 1, 2019, the unaudited pro forma combined financial information reflects the adoption of ASC 842, Leases; the recognition of additional amortization expense on intangible assets, the removal of historical amortization charges and the elimination of non-recurring acquisition-related transaction costs. The unaudited pro forma combined financial information should not be considered indicative of the results that would have occurred if the acquisition had been consummated on the assumed completion date, nor are they indicative of future results.

Disaggregated Revenues

Disaggregated Revenues	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Disaggregated Revenues	Disaggregated Revenues The following table summarizes the disaggregation of revenues by product or source, (dollars in thousands): Three Months ended 2021 2020 (unaudited) Net product sales Trokendi XR $ 71,819 $ 68,551 Oxtellar XR 27,370 23,939 APOKYN 21,730 — MYOBLOC 4,240 — XADAGO 3,222 — Total net product sales $ 128,381 $ 92,490 Royalty revenues 2,551 2,486 Total revenues $ 130,932 $ 94,976 Trokendi XR accounted for 56% and 74% of the Company’s total net product sales for the three months ended March 31, 2021 and 2020, respectively. Each of our three major customers, AmerisourceBergen Drug Corporation, Cardinal Health, Inc. and McKesson Corporation, individually accounted for more than 25% of our total net product sales and collectively accounted for more than 85% of our total net product sales in both 2021 and 2020. The Company recognized noncash royalty revenue of $2.2 million and $1.6 million, for the three months ended March 31, 2021 and 2020, respectively. Refer to Note 15, Commitments and Contingencies

Investments

Investments	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Marketable Securities Unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, December 31, 2020 (unaudited) Corporate and U.S. government agency and municipal debt securities Amortized cost $ 543,713 $ 472,306 Gross unrealized gains 8,958 11,987 Gross unrealized losses (646) (41) Total fair value $ 552,025 $ 484,252 The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, (unaudited) Less than 1 year $ 135,459 1 year to 2 years 151,713 2 years to 3 years 201,619 3 years to 4 years 63,234 Greater than 4 years — Total $ 552,025 As of March 31, 2021, there was no impairment due to credit loss on any available-for-sale marketable securities. Investment in Navitor Development and Option agreement In April 2020, the Company entered into the Development Agreement with Navitor Inc. The Company can terminate the Development Agreement upon 30 days’ notice. Under the terms of the Development Agreement, the Company and Navitor Inc. will jointly conduct a Phase II clinical program for NV-5138 (SPN-820) for TRD. The Company will bear all of the Phase I and Phase II development costs incurred by either party, up to a maximum of $50 million. In addition, the Company will incur certain other research and development support costs. There are certain additional payment amounts which could be incurred by the Company. These costs are contingent upon Navitor Inc. achieving defined development milestones. The Company has an option to acquire or license NV-5138 (SPN-820), for which additional payments would be required. In the second quarter of 2020, the Company paid Navitor Inc. a one time, nonrefundable, and non-creditable fee of $10 million for this option to acquire or license NV-5138 (SPN-820). Equity investment In addition to entering into the Development Agreement in April 2020, the Company acquired Series D Preferred Shares of Navitor Inc. for $15 million, representing an approximately 13% ownership position in Navitor Inc. In March 2021, Navitor Inc. underwent a legal restructuring. In the restructuring, Navitor Inc. became a wholly owned subsidiary of a newly formed limited liability company, Navitor LLC, and the outstanding shares of stock in Navitor Inc. were exchanged for units of membership interest in Navitor LLC having equivalent rights and preferences (Navitor Restructuring). As part of the Navitor Restructuring, the Series D Preferred Shares previously held by the Company were exchanged for Series D Preferred Units in Navitor LLC. In addition, certain assets that did not relate to NV-5138 (SPN-820) were transferred from Navitor Inc. to a newly formed entity that became a separate, wholly owned subsidiary of Navitor LLC. The Company had determined that Navitor LLC is a VIE. The Company does not consolidate this VIE because the Company lacks the power to direct the activities that most significantly impact the investee’s economic performance. Prior to the Navitor Restructuring, the investment was accounted for under the practical expedient allowed for equity securities without readily determinable fair value, which is cost minus impairment plus any changes in observable price changes from an orderly transaction of similar investments in Navitor Inc. Following the legal restructuring and exchange of the preferred shares to member equity units of Navitor LLC, the investment was accounted for under the equity method of accounting due to the Company’s ability to exert significant influence, but not control the financial and operating decisions. The majority of the assets and liabilities recorded in Navitor LLC’s financial statements represent working capital items and cash that are being used for research and development purposes and are significantly lower than the Company’s investment in Navitor LLC. This created a significant basis difference for the Company’s investment in the underlying net assets, requiring the Company to account for the investee as if it were a consolidated subsidiary in a manner consistent with the provisions of ASC 805, Business Consolidation , to apply the acquisition method of accounting. The Company has determined that substantially all of the fair value of the investment is attributable to a single IPR&D asset. As a result, the investee is not considered a business as defined in ASC 805. In the first quarter of 2021, the $15 million investment, which was previously recorded in Other assets in the condensed consolidated balance sheets, was expensed and recorded in Research and development expense in the condensed consolidated statements of earnings . The maximum exposure to losses related to the investee is a maximum of approximately $50 million in expense for Phase I and Phase II development of NV-5138 (SPN-820), and the cost of other development and formulation activities provided by the Company. We have provided no financing to the investee other than amounts required under the Development Agreement.

Fair Value of Financial Measure

Fair Value of Financial Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Measurements The fair value of an asset or liability represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between unrelated market participants. The Company reports the fair value of assets and liabilities using a three level measurement hierarchy that prioritizes the inputs used to measure fair value. Fair value hierarchy consists of the following three levels: • Level 1—Valuations based on unadjusted quoted prices in active markets that are accessible at measurement date for identical assets. • Level 2—Valuations based on quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and model-based valuations in which all significant inputs are observable in the market, either directly or indirectly (e.g., interest rates; yield curves). • Level 3—Valuations using significant inputs that are unobservable in the market and inputs that reflect the Company’s own assumptions. These are based on the best information available, including the Company’s own data. The fair value of the restricted marketable securities which are classified as level 2 financial assets is recorded in Other assets on the condensed consolidated balance sheets. There were no level 3 financial assets as of March 31, 2021 or December 31, 2020. There have been no transfers of assets or liabilities into or out of Level 3 of the fair value hierarchy. Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis The Company’s financial assets that are required to be measured at fair value on a recurring basis are as follows (dollars in thousands): Fair Value Measurements at March 31, 2021 (unaudited) Total Fair Value at March 31, Level 1 Level 2 Level 3 Assets: Cash and cash equivalents Cash $ 154,245 $ 154,245 $ — $ — Money market funds 101,397 101,397 — — Marketable securities Corporate debt securities 135,459 255 135,204 — Long term marketable securities Corporate debt securities 416,566 — 416,566 — Other noncurrent assets Marketable securities - restricted (SERP) 559 4 555 — Total assets at fair value $ 808,226 $ 255,901 $ 552,325 $ — Liabilities: Contingent consideration $ 77,720 $ — $ — $ 77,720 Total liabilities at fair value $ 77,720 $ — $ — $ 77,720 Fair Value Measurements at December 31, 2020 Total Fair Value at December 31, Level 1 Level 2 Level 3 Assets: Cash and cash equivalents Cash $ 218,550 $ 218,550 $ — $ — Money market funds 70,090 70,090 — — Marketable securities Corporate debt securities 133,893 — 133,893 — Long term marketable securities Corporate debt securities 350,359 256 350,103 — Other noncurrent assets Marketable securities - restricted (SERP) 547 3 544 — Total assets at fair value $ 773,439 $ 288,899 $ 484,540 $ — Liabilities: Contingent consideration $ 76,700 $ — $ — 76,700 Total liabilities at fair value $ 76,700 $ — $ — $ 76,700 Other Financial Instruments The carrying amounts of other financial instruments, including accounts receivable, accounts payable, and accrued expenses, approximate fair value due to their short-term maturities. The Company records its convertible debt at carrying value. The fair value of the outstanding convertible debt is based on actual trading information as well as quoted prices, both provided by bond traders. Refer to Note 8, Convertible Senior Notes Due 2023 . The Company also had an investment in Navitor LLC, a privately held company, which it classifies as Level 3 as it does not have a readily determinable fair value. In the first quarter of 2021, the $15 million investment in Navitor LLC was expensed. Refer to Note 5, Investments . Contingent Consideration The contingent consideration liabilities are measured at fair value on a recurring basis, using the same methodology as of the acquisition date; i.e., the Monte Carlo simulation for the sales-based milestones, and the income approach for the other milestones. The following table provides a reconciliation of the beginning and ending balances related to the contingent consideration for the USWM Acquisition (dollars in thousands): March 31, (unaudited) Balance at December 31, 2020 $ 76,700 Change in fair value recognized in earnings 1,020 Balance at March 31, 2021 $ 77,720

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets, Net The following table sets forth the gross carrying amounts and related accumulated amortization of intangibles assets and goodwill (dollars in thousands): Remaining Weighted- March 31, December 31, (unaudited) Goodwill $ 77,911 $ 77,911 Intangible assets: Acquired IPR&D $ 123,000 $ 123,000 Definite-lived intangible assets Acquired developed technology and product rights 9.75 - 11.75 232,000 232,000 Capitalized patent defense costs 1.75 - 6.00 43,980 43,579 Less accumulated amortization (40,244) (34,237) Total intangible assets, net $ 358,736 $ 364,342 Patent defense costs, which are deferred legal fees incurred in conjunction with defending patents for Oxtellar XR and Trokendi XR. U.S. patents covering Oxtellar XR and Trokendi XR will expire no earlier than 2027. As regards Trokendi XR, the Company entered into settlement agreements that allow third parties to enter the market by January 1, 2023, or earlier under certain circumstances. Amortization expense for intangible assets was approximately $6.0 million and $1.3 million, for the three month periods ended March 31, 2021 and 2020, respectively. The increase in expense is due to amortization of the acquired developed technology and product rights from the USWM Acquisition. As of March 31, 2021, there were no identified indicators of impairment.

Convertible Senior Notes Due 20

Convertible Senior Notes Due 2023	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Convertible Senior Notes Due 2023	Convertible Senior Notes Due 2023 The 0.625% Convertible Senior Notes Due 2023 (2023 Notes), which were issued in March 2018, bear interest at an annual rate of 0.625%, payable semi-annually in arrears on April 1 and October 1 of each year. The 2023 Notes will mature on April 1, 2023, unless earlier converted or repurchased by the Company. The Company may not redeem the 2023 Notes at its option before maturity. The total principal amount of 2023 Notes is $402.5 million. The 2023 Notes were issued pursuant to an Indenture between the Company and Wilmington Trust, National Association, as trustee. The Indenture includes customary terms and covenants, including certain events of default upon which the 2023 Notes may be due and payable immediately. The Indenture does not contain any financial or operating covenants, or any restrictions on the payment of dividends, the issuance of other indebtedness, or the issuance or repurchase of securities by the Company. Noteholders may convert their 2023 Notes at their option only in the following circumstances: (1) during any calendar quarter, if the last reported sale price per share of the Company's common stock for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading days ending on, and including the last trading day of the immediately preceding calendar quarter, exceeds 130% of the conversion price, or a price of approximately $77.13 per share on such trading day; (2) during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the "measurement period") in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company's common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on the Company's common stock, as specified in the Indenture; and (4) at any time from and including October 1, 2022, until the close of business on the second scheduled trading day immediately before the maturity date. At its election, the Company will settle conversions by paying or delivering, as applicable, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, based on the applicable conversion rate. The initial conversion rate is 16.8545 shares per $1,000 principal amount of the 2023 Notes, which represents an initial conversion price of approximately $59.33 per share, and is subject to adjustment as specified in the Indenture. In the event of conversion, if converted in cash, the holders would forgo all future interest payments, any unpaid accrued interest, and the possibility of further stock price appreciation. If a “make-whole fundamental change,” as defined in the Indenture occurs, then the Company will in certain circumstances increase the conversion rate for a specified period of time. If a “fundamental change,” as defined in the Indenture occurs, then noteholders may require the Company to repurchase their 2023 Notes at a cash repurchase price equal to the principal amount of the 2023 Notes to be repurchased, plus accrued and unpaid interest, if any. Contemporaneous with the issuance of the 2023 Notes, the Company also entered into separate privately negotiated convertible note hedge transactions (collectively, the Convertible Note Hedge Transactions) with each of the call spread counterparties. The Company issued 402,500 convertible note hedge options. In the event that shares or cash are deliverable to holders of the 2023 Notes upon conversion at limits defined in the Indenture, counterparties to the convertible note hedges will be required to deliver up to approximately 6.8 million shares of the Company’s common stock, or to pay cash to the Company in a similar amount as the value that the Company delivers to the holders of the 2023 Notes, based on a conversion price of $59.33 per share. Concurrently with entering into the Convertible Note Hedge Transactions, the Company also entered into separate privately negotiated warrant transactions (collectively, the Warrant Transactions) with each of the call spread counterparties. The Company issued a total of 6,783,939 warrants. The warrants entitle the holder to one share per warrant. The strike price of the Warrant Transactions will initially be $80.9063 per share of the Company’s common stock, and is subject to adjustment. The Convertible Note Hedge Transactions are expected to reduce the potential dilution of the Company’s common stock upon conversion of the 2023 Notes, and/or offset any potential cash payments the Company is required to make in excess of the principal amount of converted 2023 Notes, as the case may be. The Warrant Transactions were intended to partially offset the cost to the Company of the purchased Convertible Note Hedge Transactions; however, the Warrant Transactions could have a dilutive effect with respect to the Company’s common stock, to the extent that the market price per share of the Company’s common stock, as measured under the terms of the Warrant Transactions, exceeds the strike price of the warrants. The liability component of the 2023 Notes consists of the following, (dollars in thousands): March 31, December 31, (unaudited) 2023 Notes $ 402,500 $ 402,500 Unamortized debt discount and deferred financing costs (36,462) (40,749) Total carrying value $ 366,038 $ 361,751 Fair value (Level 2) $ 389,922 $ 383,381 No 2023 Notes were converted as of March 31, 2021 or December 31, 2020.

Share-Based Payments

Share-Based Payments	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Payments	Share-Based Payments Share-based compensation expense is as follows (dollars in thousands): Three Months ended 2021 2020 (unaudited) Research and development $ 588 $ 681 Selling, general and administrative 3,783 3,307 Total $ 4,371 $ 3,988 Stock Option and Stock Appreciation Rights The following table summarizes stock option and stock appreciation rights (SAR) activities: Number of Weighted- Weighted- Outstanding, December 31, 2020 5,451,862 $ 23.26 6.28 Granted 789,275 $ 29.61 Exercised (99,600) $ 22.57 Forfeited (117,313) $ 32.13 Outstanding, March 31, 2021 (unaudited) 6,024,224 $ 23.93 6.66 As of December 31, 2020: Vested and expected to vest 5,451,862 $ 23.26 6.28 Exercisable 3,218,771 $ 19.36 4.77 As of March 31, 2021: Vested and expected to vest 6,024,224 $ 23.93 6.66 Exercisable 3,806,149 $ 21.06 5.29 Restricted Stock Units The following table summarizes restricted stock unit (RSU) activities: Number of Weighted-Average Nonvested, December 31, 2020 26,055 $ 23.99 Granted 21,110 $ 29.61 Vested (26,055) $ 23.99 Forfeited — $ — Nonvested, March 31, 2021 21,110 $ 29.61 Performance Share Units The following table summarizes performance share unit (PSU) activities: Performance-Based Units Market-Based Units Total PSUs Number of PSUs Weighted- Number of PSUs Weighted- Number of PSUs Weighted- Nonvested, December 31, 2020 — $ — 15,625 $ 23.41 15,625 $ 23.41 Granted 80,000 $ 29.61 20,000 $ 28.63 100,000 $ 29.41 Nonvested, March 31, 2021 80,000 $ 29.61 35,625 $ 26.34 115,625 $ 28.60

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings per share (EPS) is calculated using the weighted-average number of common shares outstanding. Diluted EPS is calculated using the weighted-average number of common shares outstanding, including the dilutive effect of the Company’s stock option grants, SARs, RSUs, employee stock purchase plan (ESPP) awards, and the 2023 Notes, as determined per the treasury stock method. Effect of Convertible Notes and Related Convertible Note Hedges and Warrants In connection with the issuance of the 2023 Notes, the Company entered into Convertible Note Hedge and Warrant Transactions as described further in Note 8, Convertible Senior Notes Due 2023 . The expected collective impact of the Convertible Note Hedge and Warrant Transactions is to reduce the potential dilution that would occur if the price of the Company's common stock was between the conversion price of $59.33 per share and the strike price of the warrants of $80.9063 per share. The 2023 Notes and related Convertible Note Hedge and Warrant Transactions are excluded in the calculation of diluted EPS because inclusion would be anti-dilutive. In addition to the above described effect of the 2023 Notes and the related Convertible Note Hedge and Warrant Transactions, the Company also excluded the common stock equivalents of the following outstanding stock-based awards in the calculation of diluted EPS, because their inclusion would be anti-dilutive: Three Months ended 2021 2020 (unaudited) Stock options, RSUs 1,419,203 3,034,099 The following table sets forth the computation of basic and diluted net earnings per share for the three months ended March 31, 2021 and 2020 (dollars in thousands, except share and per share amounts): Three Months ended 2021 2020 (unaudited) Numerator: Net earnings $ 5,694 $ 21,518 Denominator: Weighted average shares outstanding, basic 52,927,467 52,534,787 Effect of dilutive securities: Stock options, RSUs and SARs 1,269,504 1,046,264 Weighted average shares outstanding, diluted 54,196,971 53,581,051 Earnings per share, basic $ 0.11 $ 0.41 Earnings per share, diluted $ 0.11 $ 0.40

Income Tax Expense

Income Tax Expense	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Tax Expense	Income Tax Expense The following table provides information regarding the Company’s income tax expense for the three months ended March 31, 2021 and 2020 (dollars in thousands): Three Months ended 2021 2020 (unaudited) Income tax expense $ 5,235 $ 7,516 Effective tax rate 47.9 % 25.9 % Income tax expense for the three months ended March 31, 2021, as compared to the same period in the prior year, decreased mainly due to lower earnings before taxes. The effective income tax rate increase was due to changes in the effective state tax rates as a result of the transfer of workforce between legal entities and lower earnings before taxes due to the expensing of the Navitor investment in the first quarter of 2021.

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	Leases Operating Leases The Company has operating leases for its headquarters lease and its fleet vehicles. With respect to the fleet vehicle leases, given the volume of individual leases involved in the overall arrangement, the Company applies a portfolio approach to effectively account for the operating lease assets and liabilities. The Company also elected to combine the lease and non-lease components for the fleet vehicle and headquarters leases. The Company's headquarters lease commenced on February 1, 2019 (the Commencement Date) and will continue until April 30, 2034, unless earlier terminated in accordance with the terms of the lease. The lease includes options to extend the lease for up to 10 years. Finance Lease Contemporaneous with the USWM Acquisition, USWM Enterprises adopted ASC 842, Leases. USWM Enterprises had an existing contract manufacturing agreement with Merz Pharma GmbH & Co. KGaA (Merz), for the manufacture and supply of MYOBLOC (rimabotulinumtoxinB) and NerBloc ® (finished products) (Merz Agreement). Pursuant to the Merz Agreement, Merz agreed to provide a dedicated manufacturing facility that included a stand-alone building, dedicated clean room suites, dedicated manufacturing and purification equipment, and filling and packaging production lines (collectively, the manufacturing facility) to manufacture finished products. The Merz Agreement will expire in July 2027, unless the Company and Merz mutually agree to extend the terms. The Merz Agreement may not be terminated for convenience. In addition, the Company's collaboration partner markets the drug in MYOBLOC, rimabotulinumtoxinB, in Japan under the trade name NerBloc. Under the terms of the agreement, the Company is required to purchase a minimum quantity of finished products on an annual basis. This minimum purchase requirement represents the in-substance fixed contract consideration associated with the dedicated manufacturing facility which the Company accounts for as an embedded lease. The embedded lease is preliminarily classified as a finance lease. The in-substance fixed contract consideration was allocated to the lease component, since the Company has preliminarily elected not to separate lease and non-lease components. Refer to Note 3, USWM Acquisition , for further discussion. Operating and finance lease assets and lease liabilities as reported on the condensed consolidated balance sheets are as follows (dollars in thousands): Balance Sheet Classification March 31, 2021 December 31, 2020 (unaudited) Assets Operating lease assets Other assets $ 20,808 $ 20,231 Finance lease asset Property and equipment, net 20,071 20,874 Total lease assets $ 40,879 $ 41,105 Liabilities Lease liabilities, current Operating lease liabilities, current portion Accounts payable and accrued liabilities $ 4,242 $ 3,760 Finance lease liability, current portion Other current liabilities 4,677 3,761 Lease liabilities, long term Operating lease liabilities, long term Operating lease liabilities, long term 28,532 28,579 Finance lease liability, long term Other liabilities 18,499 20,235 Total lease liabilities $ 55,950 $ 56,335
Leases	Leases Operating Leases The Company has operating leases for its headquarters lease and its fleet vehicles. With respect to the fleet vehicle leases, given the volume of individual leases involved in the overall arrangement, the Company applies a portfolio approach to effectively account for the operating lease assets and liabilities. The Company also elected to combine the lease and non-lease components for the fleet vehicle and headquarters leases. The Company's headquarters lease commenced on February 1, 2019 (the Commencement Date) and will continue until April 30, 2034, unless earlier terminated in accordance with the terms of the lease. The lease includes options to extend the lease for up to 10 years. Finance Lease Contemporaneous with the USWM Acquisition, USWM Enterprises adopted ASC 842, Leases. USWM Enterprises had an existing contract manufacturing agreement with Merz Pharma GmbH & Co. KGaA (Merz), for the manufacture and supply of MYOBLOC (rimabotulinumtoxinB) and NerBloc ® (finished products) (Merz Agreement). Pursuant to the Merz Agreement, Merz agreed to provide a dedicated manufacturing facility that included a stand-alone building, dedicated clean room suites, dedicated manufacturing and purification equipment, and filling and packaging production lines (collectively, the manufacturing facility) to manufacture finished products. The Merz Agreement will expire in July 2027, unless the Company and Merz mutually agree to extend the terms. The Merz Agreement may not be terminated for convenience. In addition, the Company's collaboration partner markets the drug in MYOBLOC, rimabotulinumtoxinB, in Japan under the trade name NerBloc. Under the terms of the agreement, the Company is required to purchase a minimum quantity of finished products on an annual basis. This minimum purchase requirement represents the in-substance fixed contract consideration associated with the dedicated manufacturing facility which the Company accounts for as an embedded lease. The embedded lease is preliminarily classified as a finance lease. The in-substance fixed contract consideration was allocated to the lease component, since the Company has preliminarily elected not to separate lease and non-lease components. Refer to Note 3, USWM Acquisition , for further discussion. Operating and finance lease assets and lease liabilities as reported on the condensed consolidated balance sheets are as follows (dollars in thousands): Balance Sheet Classification March 31, 2021 December 31, 2020 (unaudited) Assets Operating lease assets Other assets $ 20,808 $ 20,231 Finance lease asset Property and equipment, net 20,071 20,874 Total lease assets $ 40,879 $ 41,105 Liabilities Lease liabilities, current Operating lease liabilities, current portion Accounts payable and accrued liabilities $ 4,242 $ 3,760 Finance lease liability, current portion Other current liabilities 4,677 3,761 Lease liabilities, long term Operating lease liabilities, long term Operating lease liabilities, long term 28,532 28,579 Finance lease liability, long term Other liabilities 18,499 20,235 Total lease liabilities $ 55,950 $ 56,335

Composition of Balance Sheet It

Composition of Balance Sheet Items	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Composition of Balance Sheet Items	Composition of Other Balance Sheet ItemsThe following details the composition of other balance sheet items (dollars in thousands for amounts in tables): Accounts Receivables As of March 31, 2021 and December 31, 2020, the Company has reduced accounts receivable by approximately $10.9 million and $11.4 million, respectively. Prompt pay discount and contractual service fees, which were originally recorded as reduction to revenues, represents estimated amounts not expected to be paid by our customers. The Company's customers are primarily pharmaceutical wholesalers and distributors and specialty pharmacies. Receivables from our three major customers account for more than 90% of our total receivables. Inventories March 31, December 31, (unaudited) Raw materials $ 25,987 $ 22,208 Work in process 9,330 8,985 Finished goods 14,909 17,132 Total $ 50,226 $ 48,325 In April 2021, the Company received regulatory approval for SPN-812 (Qelbree) for the treatment of ADHD in pediatric patients 6 to 17 years of age. Pre-launch inventory costs for Qelbree was $24.0 million and $19.1 million as of March 31, 2021 and December 31, 2020, respectively. Inventories include acquired inventory from the USWM Acquisition. Refer to Note 3, USWM Acquisition , for further discussion of the USWM Acquisition. Property and Equipment March 31, December 31, (unaudited) Lab equipment and furniture $ 13,322 $ 12,526 Leasehold improvements 12,453 15,183 Software 2,260 2,295 Finance lease assets 22,747 22,747 Computer equipment 1,839 2,113 52,621 54,864 Less accumulated depreciation and amortization (14,671) (17,040) Total $ 37,950 $ 37,824 Depreciation and amortization expense on property and equipment was approximately $0.6 million and $0.5 million for the three months ended March 31, 2021, and 2020, respectively. The Company retired certain fully depreciated property and equipment for the three months ended March 31, 2021. As of March 31, 2021, there were no identified indicators of impairment. Accrued Payable and Accrued Liabilities March 31, December 31, (unaudited) Accrued compensation $ 13,080 $ 16,008 Accrued royalties (1) 10,635 13,890 Accrued clinical trial costs (2) 10,281 12,842 Accounts payable 5,954 6,147 Income taxes payable 5,744 — Accrued product costs 4,999 9,587 Accrued professional fees 4,524 7,730 Operating lease liabilities, current portion (3) 4,242 3,760 Other accrued expenses 10,640 8,970 Total $ 70,099 $ 78,934 _______________________________ (1) Refer to Note 15, Commitments and Contingencies . (2) Includes preclinical and all clinical trial-related costs. (3) Refer to Note 12, Leases . Accrued Product Returns and Rebates March 31, December 31, (unaudited) Accrued product rebates $ 96,638 $ 96,589 Accrued product returns 32,098 29,603 Total $ 128,736 $ 126,192 Other Liabilities March 31, December 31, (unaudited) Nonrecourse liability related to sale of future royalties, long term $ 11,763 $ 13,410 Finance lease liability, long term (1) 18,499 20,235 Other liabilities 9,413 9,146 Total $ 39,675 $ 42,791 ______________________________ (1) Refer to Note 12, Leases .

Interest Expense

Interest Expense	3 Months Ended
	Mar. 31, 2021
Other Income and Expenses [Abstract]
Interest Expense	Interest Expense The following details the composition of interest expense (dollars in thousands): Three Months ended 2021 2020 (unaudited) Interest expense $ (5,062) $ (4,693) Interest expense on nonrecourse liability related to sale of future royalties (1,035) (1,062) Total $ (6,097) $ (5,755) Interest expense includes noncash interest expense related to amortization of deferred financing costs, and amortization of the debt discount on the 2023 Notes of $4.3 million and $4.1 million for the three months ended March 31, 2021, and 2020, respectively.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Product Licenses The Company has obtained exclusive licenses from third parties for proprietary rights to support certain products and product candidates. Under these license agreements, the Company may be required to pay certain amounts upon the achievement of defined milestones. If these products are ultimately commercialized, the Company is also obligated to pay royalties to third parties, computed as a percentage of net product sales, for each respective product under a license agreement. Through the USWM Acquisition, the Company acquired licensing agreements with other pharmaceutical companies for APOKYN, XADAGO and MYOBLOC. The Company is obligated to pay royalties to third parties, computed as a percentage of net product sales, for each of the products under the respective license agreements. Royalty expense incurred is recognized as Cost of goods sold in the condensed consolidated statements of earnings. Royalty Agreement In the third quarter of 2014, the Company received $30 million pursuant to a Royalty Interest Acquisition Agreement related to the purchase, by HealthCare Royalty Partners III, L.P. (HC Royalty), of certain of the Company’s rights under the Company’s agreement with United Therapeutics Corporation. These rights are related to the commercialization of Orenitram (treprostinil) Extended-Release Tablets. Per the terms of the agreement, full ownership of the royalty rights will revert to the Company if and when a certain cumulative payment threshold is reached. Consequent to this agreement, the Company recorded a nonrecourse liability related to this transaction and amortizes this liability as noncash royalty revenue. Refer to Note 4, Disaggregated Revenues , and Note 13, Composition of Other Balance Sheet Items . USWM Enterprise Commitments Assumed As part of the USWM Acquisition, the Company assumed the remaining commitments of USWM Enterprises and its subsidiaries, which are discussed below. In addition to the annual minimum purchase quantity requirements of MYOBLOC, amounting to an estimated €3.0 million annually, under the contract manufacturing agreement with Merz for manufacture and supply, USWM Enterprises had an existing license and distribution agreement for XADAGO. This included an annual minimum promotional spend to support the marketing of XADAGO for the first five years of the agreement. As of March 31, 2021, the remaining contractual commitments were $2.4 million, of which $0.4 million is for the current period through June 2021 and the remainder is for the period from July 2021 to June 2020. Refer to Note 3, USWM Acquisition , for further discussion on the USWM Acquisition and Note 12, Leases , for further discussion on the Merz Agreement. In March 2019, which is prior to the USWM Acquisition Closing Date, MDD US Operations, LLC (formerly US WorldMeds, LLC) and its subsidiary, Solstice Neurosciences, LLC (US) (collectively, the MDD Subsidiaries) entered into a Corporate Integrity Agreement (CIA) with the Office of Inspector General of the U.S. Department of Health and Human Services. Under the CIA, the MDD Subsidiaries agreed to and paid $17.5 million to resolve U.S. Department of Justice allegations that it violated the False Claims Act and committed to the establishment and ongoing maintenance of an effective compliance program. The fine was paid by the MDD Subsidiaries prior to closing of the USWM Acquisition. As part of the USWM Acquisition, the Company assumed the remaining obligations of the CIA and could become liable for payment of certain stipulated monetary penalties in the event of any CIA violations. In addition, the Company will continue to incur significant costs through March 2024 to maintain a broad array of processes, policies and procedures necessary to comply with the CIA. Claims and Litigation

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In April 2021, the Company notified the European Medicine Agency that it will cease the marketing of rimabotulinumtoxinB (NeuroBloc) in European countries.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	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 condensed consolidated 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, 2020, 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 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 is now 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 months ended March 31, 2021 and 2020. Consolidation The Company’s condensed consolidated financial statements include those of the Company's wholly-owned subsidiaries and variable interest entities (VIE) where the Company is the primary beneficiary, if any. All significant intercompany transactions and balances have been eliminated in consolidation. 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	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. The extent to which the COVID-19 pandemic may directly or indirectly impact our business, financial condition and results of operations is highly uncertain and subject to change. As a result, certain of our estimates and assumptions, including the provision for sales deductions, the creditworthiness of customers entering into revenue arrangements, the valuation of the assets and liabilities acquired in the USWM Acquisition, and the fair values of our financial instruments, require increased judgment and carry a higher degree of variability and volatility that could result in material changes to our estimates in future periods.
Advertising Expense	Advertising Expense Advertising expense includes the cost of promotional materials and activities, such as printed materials and digital marketing, marketing programs and speaker programs. The cost of the Company's advertising efforts are expensed as incurred. The Company incurred approximately $15.3 million and $11.6 million in advertising expense for the three months ended March 31, 2021 and 2020, respectively. These expenses are recorded as a component of Selling, general and administrative expenses in the condensed consolidated statements of earnings.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes - The new standard, issued in December 2019, simplifies the accounting for income taxes. The Company adopted the guidance on January 1, 2021, on a prospective basis. The adoption of the new standard did not have a material impact to the financial statements. ASU 2020-01, Investments — Equity Securities (Topic 321), Investments — Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815), Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 - The new standard, issued in January 2020, clarifies the interaction of the equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain contracts and purchased options accounted for under Topic 815. The amendment clarifies that an entity can elect to adopt the measurement alternative, which is if an entity identifies observable price changes in orderly transactions for the identical or a similar investment of the same issuer, it should measure the equity security at fair value as of the date that the observable transaction occurred before applying or upon discontinuing the equity method. The adoption of the new standard as of January 1, 2021 did not have a material impact to the financial statements. New Accounting Pronouncements Not Yet Adopted The Company is currently evaluating the impact of the new guidance on its consolidated financial statements. ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity

USWM Acquisition (Tables)

USWM Acquisition (Tables)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Purchase price consideration	As Initially Reported Measurement Period Adjustments As Adjusted Cash consideration $ 304,194 $ 1,341 $ 305,535 Estimated fair value of contingent consideration 115,700 (40,900) 74,800 Estimated total purchase consideration $ 419,894 $ (39,559) $ 380,335 Cash consideration to Seller - net of cash acquired (1) $ 297,200 $ 1,341 $ 298,541 ______________________________ (1) Represents total purchase price, less cash and cash equivalents acquired, and contingent consideration liabilities. Measurement period adjustment reflects additional payments made to Seller following the Closing date for working capital adjustments on the purchase price
Schedule of recognized identified assets acquired and liabilities assumed	The following table presents the Company’s preliminary estimates of the fair value of the assets acquired and liabilities assumed as of the Closing Date, and subsequent measurement period adjustments recorded (dollars in thousands): As Initially Reported Measurement Period Adjustments As Adjusted Cash and cash equivalents $ 6,994 $ — $ 6,994 Accounts receivable 18,474 — 18,474 Inventories (1) 10,400 (700) 9,700 Prepaid expenses and other current assets 3,564 — 3,564 Property and equipment 454 — 454 Finance lease asset (2) 22,747 — 22,747 Intangible assets (1) 387,000 (32,000) 355,000 Other assets 340 — 340 Total fair value of assets acquired 449,973 (32,700) 417,273 Accounts payable (2,573) — (2,573) Accrued expenses and other current liabilities (23,339) — (23,339) Finance lease liability (2) (22,747) — (22,747) Deferred income tax liabilities, net (3) (69,515) 3,325 (66,190) Total fair value of liabilities assumed (118,174) 3,325 (114,849) Total identifiable net assets $ 331,799 $ (29,375) $ 302,424 Goodwill 88,095 (10,184) 77,911 Total purchase price (4) $ 419,894 $ (39,559) $ 380,335 ______________________________ (1) Measurement period adjustments to intangible assets and inventory are primarily due to updates to inputs and assumptions based on information related to the facts and circumstances that existed as of the acquisition date. (2) Refer to Note 12 for further discussion of the acquired finance lease asset and assumed lease liability. (3) Includes tax attributes that are subject to tax limitations. Measurement period adjustment is primarily due to the tax impact of the changes in the initial estimate of the fair value of intangible assets and inventories. (4) Measurement period adjustments include an adjustment to the fair value of the contingent consideration net of the additional cash payment
Finite-lived and indefinite-lived intangible assets acquired as part of business combination	The following table summarizes the preliminary purchase price allocation, and the preliminary average remaining useful lives for identifiable intangible assets (dollars in thousands): Estimated Fair Value Estimated Useful Lives as of Closing Date Acquired In-process Research & Development $ 123,000 n/a Acquired Developed Technology and Product Rights 232,000 10.5 - 12.5 Total intangible assets $ 355,000
Business acquisition, pro forma information	The following table presents the unaudited pro forma combined financial information as if the USWM Acquisition had occurred on January 1, 2019 (dollars in thousands): Three Months ended March 31, 2020 Pro forma total revenues $ 133,162 Pro forma net earnings 21,314

Disaggregated Revenues (Tables)

Disaggregated Revenues (Tables)	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Summary of disaggregation of revenues by nature	The following table summarizes the disaggregation of revenues by product or source, (dollars in thousands): Three Months ended 2021 2020 (unaudited) Net product sales Trokendi XR $ 71,819 $ 68,551 Oxtellar XR 27,370 23,939 APOKYN 21,730 — MYOBLOC 4,240 — XADAGO 3,222 — Total net product sales $ 128,381 $ 92,490 Royalty revenues 2,551 2,486 Total revenues $ 130,932 $ 94,976

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of unrestricted available-for-sale marketable securities	Unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, December 31, 2020 (unaudited) Corporate and U.S. government agency and municipal debt securities Amortized cost $ 543,713 $ 472,306 Gross unrealized gains 8,958 11,987 Gross unrealized losses (646) (41) Total fair value $ 552,025 $ 484,252
Schedule of contractual maturities of the unrestricted available-for-sale marketable securities held	The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, (unaudited) Less than 1 year $ 135,459 1 year to 2 years 151,713 2 years to 3 years 201,619 3 years to 4 years 63,234 Greater than 4 years — Total $ 552,025

Fair Value of Financial Measu_2

Fair Value of Financial Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of fair value of the financial assets and liabilities	The Company’s financial assets that are required to be measured at fair value on a recurring basis are as follows (dollars in thousands): Fair Value Measurements at March 31, 2021 (unaudited) Total Fair Value at March 31, Level 1 Level 2 Level 3 Assets: Cash and cash equivalents Cash $ 154,245 $ 154,245 $ — $ — Money market funds 101,397 101,397 — — Marketable securities Corporate debt securities 135,459 255 135,204 — Long term marketable securities Corporate debt securities 416,566 — 416,566 — Other noncurrent assets Marketable securities - restricted (SERP) 559 4 555 — Total assets at fair value $ 808,226 $ 255,901 $ 552,325 $ — Liabilities: Contingent consideration $ 77,720 $ — $ — $ 77,720 Total liabilities at fair value $ 77,720 $ — $ — $ 77,720 Fair Value Measurements at December 31, 2020 Total Fair Value at December 31, Level 1 Level 2 Level 3 Assets: Cash and cash equivalents Cash $ 218,550 $ 218,550 $ — $ — Money market funds 70,090 70,090 — — Marketable securities Corporate debt securities 133,893 — 133,893 — Long term marketable securities Corporate debt securities 350,359 256 350,103 — Other noncurrent assets Marketable securities - restricted (SERP) 547 3 544 — Total assets at fair value $ 773,439 $ 288,899 $ 484,540 $ — Liabilities: Contingent consideration $ 76,700 $ — $ — 76,700 Total liabilities at fair value $ 76,700 $ — $ — $ 76,700
Schedule of unrestricted available-for-sale marketable securities	Unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, December 31, 2020 (unaudited) Corporate and U.S. government agency and municipal debt securities Amortized cost $ 543,713 $ 472,306 Gross unrealized gains 8,958 11,987 Gross unrealized losses (646) (41) Total fair value $ 552,025 $ 484,252
Schedule of contractual maturities of the unrestricted available-for-sale marketable securities held	The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands): March 31, (unaudited) Less than 1 year $ 135,459 1 year to 2 years 151,713 2 years to 3 years 201,619 3 years to 4 years 63,234 Greater than 4 years — Total $ 552,025
Reconciliation of the Beginning and Ending Balances Related to the Contingent Consideration	The following table provides a reconciliation of the beginning and ending balances related to the contingent consideration for the USWM Acquisition (dollars in thousands): March 31, (unaudited) Balance at December 31, 2020 $ 76,700 Change in fair value recognized in earnings 1,020 Balance at March 31, 2021 $ 77,720

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table sets forth the gross carrying amounts and related accumulated amortization of intangibles assets and goodwill (dollars in thousands): Remaining Weighted- March 31, December 31, (unaudited) Goodwill $ 77,911 $ 77,911 Intangible assets: Acquired IPR&D $ 123,000 $ 123,000 Definite-lived intangible assets Acquired developed technology and product rights 9.75 - 11.75 232,000 232,000 Capitalized patent defense costs 1.75 - 6.00 43,980 43,579 Less accumulated amortization (40,244) (34,237) Total intangible assets, net $ 358,736 $ 364,342

Convertible Senior Notes Due _2

Convertible Senior Notes Due 2023 (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Summary of liability component of 2023 Notes	The liability component of the 2023 Notes consists of the following, (dollars in thousands): March 31, December 31, (unaudited) 2023 Notes $ 402,500 $ 402,500 Unamortized debt discount and deferred financing costs (36,462) (40,749) Total carrying value $ 366,038 $ 361,751 Fair value (Level 2) $ 389,922 $ 383,381

Share-Based Payments (Tables)

Share-Based Payments (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of share-based compensation expense	Share-based compensation expense is as follows (dollars in thousands): Three Months ended 2021 2020 (unaudited) Research and development $ 588 $ 681 Selling, general and administrative 3,783 3,307 Total $ 4,371 $ 3,988
Summary of stock options and SAR activities	The following table summarizes stock option and stock appreciation rights (SAR) activities: Number of Weighted- Weighted- Outstanding, December 31, 2020 5,451,862 $ 23.26 6.28 Granted 789,275 $ 29.61 Exercised (99,600) $ 22.57 Forfeited (117,313) $ 32.13 Outstanding, March 31, 2021 (unaudited) 6,024,224 $ 23.93 6.66 As of December 31, 2020: Vested and expected to vest 5,451,862 $ 23.26 6.28 Exercisable 3,218,771 $ 19.36 4.77 As of March 31, 2021: Vested and expected to vest 6,024,224 $ 23.93 6.66 Exercisable 3,806,149 $ 21.06 5.29
Summary of restricted stock units	The following table summarizes restricted stock unit (RSU) activities: Number of Weighted-Average Nonvested, December 31, 2020 26,055 $ 23.99 Granted 21,110 $ 29.61 Vested (26,055) $ 23.99 Forfeited — $ — Nonvested, March 31, 2021 21,110 $ 29.61
Summary of performance stock unit	The following table summarizes performance share unit (PSU) activities: Performance-Based Units Market-Based Units Total PSUs Number of PSUs Weighted- Number of PSUs Weighted- Number of PSUs Weighted- Nonvested, December 31, 2020 — $ — 15,625 $ 23.41 15,625 $ 23.41 Granted 80,000 $ 29.61 20,000 $ 28.63 100,000 $ 29.41 Nonvested, March 31, 2021 80,000 $ 29.61 35,625 $ 26.34 115,625 $ 28.60

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of common stock equivalents excluded in the calculation of diluted earnings per share	In addition to the above described effect of the 2023 Notes and the related Convertible Note Hedge and Warrant Transactions, the Company also excluded the common stock equivalents of the following outstanding stock-based awards in the calculation of diluted EPS, because their inclusion would be anti-dilutive: Three Months ended 2021 2020 (unaudited) Stock options, RSUs 1,419,203 3,034,099
Schedule of computation of basic and diluted earnings per share	The following table sets forth the computation of basic and diluted net earnings per share for the three months ended March 31, 2021 and 2020 (dollars in thousands, except share and per share amounts): Three Months ended 2021 2020 (unaudited) Numerator: Net earnings $ 5,694 $ 21,518 Denominator: Weighted average shares outstanding, basic 52,927,467 52,534,787 Effect of dilutive securities: Stock options, RSUs and SARs 1,269,504 1,046,264 Weighted average shares outstanding, diluted 54,196,971 53,581,051 Earnings per share, basic $ 0.11 $ 0.41 Earnings per share, diluted $ 0.11 $ 0.40

Income Tax Expense (Tables)

Income Tax Expense (Tables)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of reconciliation of income tax expense at the U.S Federal statutory income tax rate to the entity's effective income tax rate	The following table provides information regarding the Company’s income tax expense for the three months ended March 31, 2021 and 2020 (dollars in thousands): Three Months ended 2021 2020 (unaudited) Income tax expense $ 5,235 $ 7,516 Effective tax rate 47.9 % 25.9 %

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Schedule of balance sheet information related to leases	Operating and finance lease assets and lease liabilities as reported on the condensed consolidated balance sheets are as follows (dollars in thousands): Balance Sheet Classification March 31, 2021 December 31, 2020 (unaudited) Assets Operating lease assets Other assets $ 20,808 $ 20,231 Finance lease asset Property and equipment, net 20,071 20,874 Total lease assets $ 40,879 $ 41,105 Liabilities Lease liabilities, current Operating lease liabilities, current portion Accounts payable and accrued liabilities $ 4,242 $ 3,760 Finance lease liability, current portion Other current liabilities 4,677 3,761 Lease liabilities, long term Operating lease liabilities, long term Operating lease liabilities, long term 28,532 28,579 Finance lease liability, long term Other liabilities 18,499 20,235 Total lease liabilities $ 55,950 $ 56,335

Composition of Balance Sheet _2

Composition of Balance Sheet Items (Tables)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of inventories	Inventories March 31, December 31, (unaudited) Raw materials $ 25,987 $ 22,208 Work in process 9,330 8,985 Finished goods 14,909 17,132 Total $ 50,226 $ 48,325
Schedule of property and equipment	Property and Equipment March 31, December 31, (unaudited) Lab equipment and furniture $ 13,322 $ 12,526 Leasehold improvements 12,453 15,183 Software 2,260 2,295 Finance lease assets 22,747 22,747 Computer equipment 1,839 2,113 52,621 54,864 Less accumulated depreciation and amortization (14,671) (17,040) Total $ 37,950 $ 37,824
Schedule of accrued expenses and other current liabilities	Accrued Payable and Accrued Liabilities March 31, December 31, (unaudited) Accrued compensation $ 13,080 $ 16,008 Accrued royalties (1) 10,635 13,890 Accrued clinical trial costs (2) 10,281 12,842 Accounts payable 5,954 6,147 Income taxes payable 5,744 — Accrued product costs 4,999 9,587 Accrued professional fees 4,524 7,730 Operating lease liabilities, current portion (3) 4,242 3,760 Other accrued expenses 10,640 8,970 Total $ 70,099 $ 78,934 _______________________________ (1) Refer to Note 15, Commitments and Contingencies . (2) Includes preclinical and all clinical trial-related costs. (3) Refer to Note 12, Leases .
Schedule of accrued product returns and rebates	Accrued Product Returns and Rebates March 31, December 31, (unaudited) Accrued product rebates $ 96,638 $ 96,589 Accrued product returns 32,098 29,603 Total $ 128,736 $ 126,192
Other liabilities	Other Liabilities March 31, December 31, (unaudited) Nonrecourse liability related to sale of future royalties, long term $ 11,763 $ 13,410 Finance lease liability, long term (1) 18,499 20,235 Other liabilities 9,413 9,146 Total $ 39,675 $ 42,791 ______________________________ (1) Refer to Note 12, Leases .

Interest Expense (Tables)

Interest Expense (Tables)	3 Months Ended
	Mar. 31, 2021
Other Income and Expenses [Abstract]
Schedule of interest expense	The following details the composition of interest expense (dollars in thousands): Three Months ended 2021 2020 (unaudited) Interest expense $ (5,062) $ (4,693) Interest expense on nonrecourse liability related to sale of future royalties (1,035) (1,062) Total $ (6,097) $ (5,755)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2021segment
Accounting Policies [Abstract]
Number of operating segments	1

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Advertising Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Advertising costs	$ 15.3	$ 11.6

USWM Acquisition - Narrative (D

USWM Acquisition - Narrative (Details) - USD ($) $ in Thousands	Jun. 09, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Other noncash adjustments, net		$ 1,020	$ 0
SPN-830 Regulatory And Commercial Activities
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	$ 130,000
SPN-830 Future Sales Performance
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	100,000
SPN-830 FDA Acceptance Milestone
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	25,000
SPN-830 NDA Approval Milestone
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	105,000
SPN-830 First Commercial And Sale
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	100,000
APOKYN
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	35,000
APOKYN And SPN-830
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	65,000
MDD US Enterprises LLC (Formerly USWM Enterprises)
Business Acquisition [Line Items]
Cash consideration to Seller - net of cash acquired	298,541
Additional cash payments upon milestone achievements maximum	230,000
Estimated fair value of contingent consideration	74,800
Additional payable to seller					$ 1,300
Additional cash payments upon milestone achievements minimum	0
Other noncash adjustments, net		40,900		$ (40,900)
Contingent consideration	74,800
Estimated Fair Value	355,000
Intangible assets		$ (32,000)		$ (32,000)
MDD US Enterprises LLC (Formerly USWM Enterprises) | Acquired IPR&D
Business Acquisition [Line Items]
Estimated Fair Value	123,000
MDD US Enterprises LLC (Formerly USWM Enterprises) | Acquired developed technology and product rights
Business Acquisition [Line Items]
Estimated Fair Value	232,000
MDD US Enterprises LLC (Formerly USWM Enterprises) | As Initially Reported
Business Acquisition [Line Items]
Cash consideration to Seller - net of cash acquired	297,200
Estimated fair value of contingent consideration	115,700
Estimated Fair Value	387,000
MDD US Enterprises LLC (Formerly USWM Enterprises) | As Initially Reported | Acquired IPR&D
Business Acquisition [Line Items]
Estimated Fair Value	150,000
MDD US Enterprises LLC (Formerly USWM Enterprises) | As Initially Reported | Acquired developed technology and product rights
Business Acquisition [Line Items]
Estimated Fair Value	$ 237,000

USWM Acquisition - Purchase Pri

USWM Acquisition - Purchase Price Consideration (Details) - USD ($) $ in Thousands	Jun. 09, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Measurement Period Adjustments
Contingent consideration expense		$ 1,020	$ 0
MDD US Enterprises LLC (Formerly USWM Enterprises)
Business Acquisition [Line Items]
Cash consideration	$ 305,535
Estimated fair value of contingent consideration	74,800
Estimated fair value of contingent consideration	380,335
Cash consideration to Seller - net of cash acquired	298,541
Measurement Period Adjustments
Cash consideration				$ 1,341
Contingent consideration expense		$ 40,900		(40,900)
Total purchase price (4)				(39,559)
Cash consideration to Seller - net of cash acquired				$ 1,341
As Initially Reported | MDD US Enterprises LLC (Formerly USWM Enterprises)
Business Acquisition [Line Items]
Cash consideration	304,194
Estimated fair value of contingent consideration	115,700
Estimated fair value of contingent consideration	419,894
Cash consideration to Seller - net of cash acquired	$ 297,200

USWM Acquisition - Schedule of

USWM Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	3 Months Ended	10 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 09, 2020
Business Acquisition [Line Items]
Goodwill	$ 77,911	$ 77,911	$ 77,911
MDD US Enterprises LLC (Formerly USWM Enterprises)
Business Acquisition [Line Items]
Cash and cash equivalents				$ 6,994
Accounts receivable				18,474
Inventories				9,700
Prepaid expenses and other current assets				3,564
Property and equipment				454
Finance lease asset				22,747
Fair value of intangible assets				355,000
Other assets				340
Total fair value of assets acquired				417,273
Accounts payable				(2,573)
Accrued expenses and other current liabilities				(23,339)
Finance lease liability				(22,747)
Deferred income tax liabilities, net				(66,190)
Total fair value of liabilities assumed				(114,849)
Total identifiable net assets				302,424
Goodwill				77,911
Total purchase price (4)				380,335
Measurement Period Adjustments
Inventories (1)		(700)
Intangible assets	$ (32,000)	(32,000)
Total fair value of assets acquired		(32,700)
Deferred income tax liabilities, net		(3,325)
Total fair value of liabilities assumed		(3,325)
Total identifiable net assets		(29,375)
Goodwill		(10,184)
Total purchase price (4)		$ (39,559)
MDD US Enterprises LLC (Formerly USWM Enterprises) | As Initially Reported
Business Acquisition [Line Items]
Cash and cash equivalents				6,994
Accounts receivable				18,474
Inventories				10,400
Prepaid expenses and other current assets				3,564
Property and equipment				454
Finance lease asset				22,747
Fair value of intangible assets				387,000
Other assets				340
Total fair value of assets acquired				449,973
Accounts payable				(2,573)
Accrued expenses and other current liabilities				(23,339)
Finance lease liability				(22,747)
Deferred income tax liabilities, net				(69,515)
Total fair value of liabilities assumed				(118,174)
Total identifiable net assets				331,799
Goodwill				88,095
Total purchase price (4)				$ 419,894

USWM Acquisition - Components o

USWM Acquisition - Components of Intangible Assets and Estimated Useful Lives (Details) - MDD US Enterprises LLC (Formerly USWM Enterprises) $ in Thousands	Jun. 09, 2020USD ($)
Business Acquisition [Line Items]
Estimated Fair Value	$ 355,000
Acquired IPR&D
Business Acquisition [Line Items]
Estimated Fair Value	123,000
Acquired developed technology and product rights
Business Acquisition [Line Items]
Estimated Fair Value	$ 232,000
Acquired developed technology and product rights | Minimum
Business Acquisition [Line Items]
Estimated Useful Lives as of Closing Date (in years)	10 years 6 months
Acquired developed technology and product rights | Maximum
Business Acquisition [Line Items]
Estimated Useful Lives as of Closing Date (in years)	12 years 6 months

USWM Acquisition - Pro Forma In

USWM Acquisition - Pro Forma Information (Details) - MDD US Enterprises LLC (Formerly USWM Enterprises) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Business Acquisition [Line Items]
Pro forma total revenues	$ 133,162
Pro forma net earnings	$ 21,314

Disaggregated Revenues - Summar

Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 130,932	$ 94,976
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	128,381	92,490
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	71,819	68,551
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	27,370	23,939
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	21,730	0
MYOBLOC
Disaggregation of Revenue [Line Items]
Total revenues	4,240	0
XADAGO
Disaggregation of Revenue [Line Items]
Total revenues	3,222	0
Royalty revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,551	$ 2,486

Disaggregated Revenues - Narrat

Disaggregated Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Recognition
Non-cash royalty revenue	$ 2.2	$ 1.6
Revenue from Contract with Customer Benchmark | Product Concentration Risk | Trokendi XR
Revenue Recognition
Concentration risk percentage (more than)	56.00%	74.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Three Major Customers
Revenue Recognition
Concentration risk percentage (more than)	25.00%	85.00%

Investments - Unrestricted Mark

Investments - Unrestricted Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized cost	$ 543,713	$ 472,306
Gross unrealized gains	8,958	11,987
Gross unrealized losses	(646)	(41)
Total fair value	$ 552,025	$ 484,252

Investments - Contractual Matur

Investments - Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Less than 1 year	$ 135,459
1 year to 2 years	151,713
2 years to 3 years	201,619
3 years to 4 years	63,234
Greater than 4 years	0
Total	$ 552,025	$ 484,252

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Impairment due to credit losses		$ 0
Navitor Pharmaceuticals, Inc. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Agreement termination notice period	30 days
Threshold for development costs payments	$ 50,000,000
Payment for option issue fee			$ 10,000,000
Investments		$ 15,000,000
VIE, qualitative or quantitative information, ownership percentage	13.00%

Fair Value of Financial Measu_3

Fair Value of Financial Measurements - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair value of financial instruments
Impairment due to credit losses	$ 0
Recurring
Fair value of financial instruments
Total assets at fair value	808,226,000	$ 773,439,000
Recurring | Level 3
Fair value of financial instruments
Total assets at fair value	$ 0	$ 0

Fair Value of Financial Measu_4

Fair Value of Financial Measurements - Carrying Value (Details) - Recurring - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Other noncurrent assets
Marketable securities - restricted (SERP)	$ 559,000	$ 547,000
Total assets at fair value	808,226,000	773,439,000
Liabilities:
Contingent consideration	77,720,000	76,700,000
Total liabilities at fair value	77,720,000	76,700,000
Corporate debt securities
Marketable securities
Marketable securities	135,459,000	133,893,000
Long term marketable securities
Long term marketable securities	416,566,000	350,359,000
Cash
Assets:
Cash and cash equivalents	154,245,000	218,550,000
Money market funds
Assets:
Cash and cash equivalents	101,397,000	70,090,000
Level 1
Other noncurrent assets
Marketable securities - restricted (SERP)	4,000	3,000
Total assets at fair value	255,901,000	288,899,000
Liabilities:
Contingent consideration	0	0
Total liabilities at fair value	0	0
Level 1 | Corporate debt securities
Marketable securities
Marketable securities	255,000	0
Long term marketable securities
Long term marketable securities	0	256,000
Level 1 | Cash
Assets:
Cash and cash equivalents	154,245,000	218,550,000
Level 1 | Money market funds
Assets:
Cash and cash equivalents	101,397,000	70,090,000
Level 2
Other noncurrent assets
Marketable securities - restricted (SERP)	555,000	544,000
Total assets at fair value	552,325,000	484,540,000
Liabilities:
Contingent consideration	0	0
Total liabilities at fair value	0	0
Level 2 | Corporate debt securities
Marketable securities
Marketable securities	135,204,000	133,893,000
Long term marketable securities
Long term marketable securities	416,566,000	350,103,000
Level 2 | Cash
Assets:
Cash and cash equivalents	0	0
Level 2 | Money market funds
Assets:
Cash and cash equivalents	0	0
Level 3
Other noncurrent assets
Marketable securities - restricted (SERP)	0	0
Total assets at fair value	0	0
Liabilities:
Contingent consideration	77,720,000	76,700,000
Total liabilities at fair value	77,720,000	76,700,000
Level 3 | Corporate debt securities
Marketable securities
Marketable securities	0	0
Long term marketable securities
Long term marketable securities	0	0
Level 3 | Cash
Assets:
Cash and cash equivalents	0	0
Level 3 | Money market funds
Assets:
Cash and cash equivalents	$ 0	$ 0

Fair Value of Financial Measu_5

Fair Value of Financial Measurements - Reconciliation of the Beginning and Ending Balances Related to the Contingent Consideration (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2020	$ 76,700
Change in fair value recognized in earnings	1,020
Balance at March 31, 2021	$ 77,720

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Goodwill and Intangible Assets Gross Carrying Amount and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Intangible assets:
Goodwill	$ 77,911	$ 77,911
Less accumulated amortization	(40,244)	(34,237)
Total intangible assets, net	358,736	364,342
Acquired developed technology and product rights
Intangible assets:
Intangible assets subject to amortization	232,000	232,000
Capitalized patent defense costs
Intangible assets:
Intangible assets subject to amortization	43,980	43,579
Acquired IPR&D
Intangible assets:
Acquired IPR&D	$ 123,000	$ 123,000
Minimum | Acquired developed technology and product rights
Intangible assets:
Remaining Weighted- Average Life (Years)	9 years 9 months
Minimum | Capitalized patent defense costs
Intangible assets:
Remaining Weighted- Average Life (Years)	1 year 9 months
Maximum | Acquired developed technology and product rights
Intangible assets:
Remaining Weighted- Average Life (Years)	11 years 9 months
Maximum | Capitalized patent defense costs
Intangible assets:
Remaining Weighted- Average Life (Years)	6 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 6,007	$ 1,261

Convertible Senior Notes Due _3

Convertible Senior Notes Due 2023 - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)day$ / sharesRateshares	Dec. 31, 2020USD ($)
Notes payable
Strike price of the warrant transactions (in dollars per share) | $ / shares	$ 80.9063
Convertible Debt
Notes payable
Interest rate	0.625%
Principal amount of debt | $	$ 402,500,000	$ 402,500,000
Conversion rate for the notes (in shares per $1,000 principal amount)	0.0168545
Conversion price, per share of common stock (in dollars per share) | $ / shares	$ 59.33
Convertible note hedge options issued (in shares) | shares	402,500
Common stock issued upon conversion of notes (in shares) | shares	6,800,000
Warrants issued (in shares) | shares	6,783,939
Number of shares per warrant entitled to holder (in shares) | shares	1
Conversion of debt to equity | $	$ 0	$ 0
Convertible Debt | Conversion Circumstance One
Notes payable
Threshold trading days (whether or not consecutive) | day	20
Consecutive trading day period (in days) | day	30
Conversion rate of the notes on trading day (as percent)	130.00%
Conversion option stock price trigger (in dollars per share) | $ / shares	$ 77.13
Convertible Debt | Conversion Circumstance Two
Notes payable
Threshold trading days (whether or not consecutive) | day	5
Consecutive trading day period (in days) | day	10
Conversion rate of the notes on trading day (as percent) | Rate	98.00%

Convertible Senior Notes Due _4

Convertible Senior Notes Due 2023 - Summary of liability component of 2023 Notes (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total carrying value	$ 366,038,000	$ 361,751,000
Convertible Debt
Debt Instrument [Line Items]
2023 Notes	402,500,000	402,500,000
Unamortized debt discount and deferred financing costs	(36,462,000)	(40,749,000)
Total carrying value	366,038,000	361,751,000
Convertible Notes | Level 2
Debt Instrument [Line Items]
Fair value (Level 2)	$ 389,922,000	$ 383,381,000

Share-Based Payments - Share-ba

Share-Based Payments - Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based payments
Total	$ 4,371	$ 3,988
Research and development
Share-based payments
Total	588	681
Selling, general and administrative
Share-based payments
Total	$ 3,783	$ 3,307

Share-Based Payments - SAR Acti

Share-Based Payments - SAR Activity (Details) - Stock option and Stock Appreciation Rights - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Number of Options
Outstanding at the beginning of the period (in shares)	5,451,862
Granted (in shares)	789,275
Exercised (in shares)	(99,600)
Forfeited (in shares)	(117,313)
Outstanding at the end of the period (in shares)	6,024,224	5,451,862
Exercisable (in shares)	3,806,149	3,218,771
Vested and expected to vest (in shares)	6,024,224	5,451,862
Weighted- Average Exercise Price (per share)
Outstanding at the beginning of the period (in dollars per share)	$ 23.26
Granted (in dollars per share)	29.61
Exercised (in dollars per share)	22.57
Forfeited (in dollars per share)	32.13
Outstanding at the end of the period (in dollars per share)	23.93	$ 23.26
Exercisable (in dollars per share)	21.06	19.36
Vested and expected to vest (in dollars per share)	$ 23.93	$ 23.26
Weighted- Average Remaining Contractual Term (in years)
Outstanding at the end of the period	6 years 7 months 28 days	6 years 3 months 10 days
Vested and expected to vest	6 years 7 months 28 days	6 years 3 months 10 days
Exercisable	5 years 3 months 14 days	4 years 9 months 7 days

Share-Based Payments - Restrict

Share-Based Payments - Restricted Stock Units (Details) - RSUs	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Number of RSUs
Nonvested, beginning balance (in shares) | shares	26,055
Granted (in shares) | shares	21,110
Vested (in shares) | shares	(26,055)
Forfeited (in shares) | shares	0
Nonvested, ending balance (in shares) | shares	21,110
Weighted-Average Grant Date Fair Value per Share
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 23.99
Granted (in dollars per share) | $ / shares	29.61
Vested (in dollars per share) | $ / shares	23.99
Forfeited (in dollars per share) | $ / shares	0
Nonvested, ending balance (in dollars per share) | $ / shares	$ 29.61

Share-Based Payments - Performa

Share-Based Payments - Performance Stock Units (Details)	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Total PSUs
Number of PSUs
Nonvested, beginning balance (in shares)	15,625
Granted (in shares)	100,000
Nonvested, ending balance (in shares)	115,625
Weighted-Average Grant Date Fair Value per Share
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 23.41
Weighted average fair value, grant date, (in dollars per share) | $ / shares	29.41
Nonvested, ending balance (in dollars per share) | $ / shares	$ 28.60
Vested (in shares)	0
Forfeited (in shares)	0
Performance-Based Units
Number of PSUs
Nonvested, beginning balance (in shares)	0
Granted (in shares)	80,000
Nonvested, ending balance (in shares)	80,000
Weighted-Average Grant Date Fair Value per Share
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 0
Weighted average fair value, grant date, (in dollars per share) | $ / shares	29.61
Nonvested, ending balance (in dollars per share) | $ / shares	$ 29.61
Market-Based Units
Number of PSUs
Nonvested, beginning balance (in shares)	15,625
Granted (in shares)	20,000
Nonvested, ending balance (in shares)	35,625
Weighted-Average Grant Date Fair Value per Share
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 23.41
Weighted average fair value, grant date, (in dollars per share) | $ / shares	28.63
Nonvested, ending balance (in dollars per share) | $ / shares	$ 26.34

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income per share
Strike price of the warrant transactions (in dollars per share)	$ 80.9063
Numerator:
Net earnings	$ 5,694	$ 21,518
Denominator:
Weighted average shares outstanding, basic (in shares)	52,927,467	52,534,787
Effect of dilutive securities:
Stock options, RSU and SAR (in shares)	1,269,504	1,046,264
Weighted average shares outstanding, diluted (in shares)	54,196,971	53,581,051
Earnings per share, basic (in dollars per share)	$ 0.11	$ 0.41
Earnings per share, diluted (in dollars per share)	$ 0.11	$ 0.40
Stock options, RSUs
Income per share
Common stock equivalents excluded in the calculation of diluted income per share (in shares)	1,419,203	3,034,099
Convertible Debt
Income per share
Conversion price, per share of common stock (in dollars per share)	$ 59.33

Income Tax Expense (Details)

Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 5,235	$ 7,516
Effective tax rate	47.90%	25.90%

Leases - Leases Balance Sheet I

Leases - Leases Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Operating lease assets	$ 20,808	$ 20,231
Finance lease asset	20,071	20,874
Total lease assets	$ 40,879	$ 41,105
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net
Lease liabilities, current
Operating lease liabilities, current portion	$ 4,242	$ 3,760
Finance lease liability, current portion	$ 4,677	$ 3,761
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Lease liabilities, long term
Operating lease liabilities, long term	$ 28,532	$ 28,579
Finance lease liability, long term	$ 18,499	$ 20,235
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease liabilities, long term	Operating lease liabilities, long term
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Total lease liabilities	$ 55,950	$ 56,335

Leases - Narrative (Details)

Leases - Narrative (Details)	Feb. 01, 2019
Leases [Abstract]
Optional lease renewal term (in years)	10 years

Composition of Balance Sheet _3

Composition of Balance Sheet Items - Accounts Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for expected sales discounts and allowances	$ 10.9	$ 11.4
Three Major Customers | Accounts Receivable | Customer Concentration Risk
Concentration of Credit Risk
Concentration risk percentage (more than)	90.00%

Composition of Balance Sheet _4

Composition of Balance Sheet Items - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 25,987	$ 22,208
Work in process	9,330	8,985
Finished goods	14,909	17,132
Total inventories	50,226	48,325
Inventory [Line Items]
Raw materials	25,987	22,208
Product Candidates
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	24,000	19,100
Inventory [Line Items]
Raw materials	$ 24,000	$ 19,100

Composition of Balance Sheet _5

Composition of Balance Sheet Items - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property and equipment
Finance lease assets	$ 22,747		$ 22,747
Total property and equipment, gross	52,621		54,864
Less accumulated depreciation and amortization	(14,671)		(17,040)
Property and equipment, net	37,950		37,824
Depreciation and amortization expense	600	$ 500
Lab equipment and furniture
Property and equipment
Property and equipment, gross	13,322		12,526
Leasehold improvements
Property and equipment
Property and equipment, gross	12,453		15,183
Software
Property and equipment
Property and equipment, gross	2,260		2,295
Computer equipment
Property and equipment
Property and equipment, gross	$ 1,839		$ 2,113

Composition of Balance Sheet _6

Composition of Balance Sheet Items Accrued Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation	$ 13,080	$ 16,008
Accrued royalties	10,635	13,890
Accrued clinical trial costs	10,281	12,842
Accounts payable	5,954	6,147
Income taxes payable	5,744	0
Accrued product costs	4,999	9,587
Accrued professional fees	4,524	7,730
Operating lease liabilities, current portion	4,242	3,760
Other accrued expenses	10,640	8,970
Total	$ 70,099	$ 78,934

Composition of Balance Sheet _7

Composition of Balance Sheet Items - Accrued Product Returns and Rebates (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued product rebates	$ 96,638	$ 96,589
Accrued product returns	32,098	29,603
Total	$ 128,736	$ 126,192

Composition of Balance Sheet _8

Composition of Balance Sheet Items - Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nonrecourse liability related to sale of future royalties, long term	$ 11,763	$ 13,410
Finance lease liability, long term	18,499	20,235
Other liabilities	9,413	9,146
Total	$ 39,675	$ 42,791

Interest Expense (Details)

Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Interest expense	$ (5,062)	$ (4,693)
Interest expense on nonrecourse liability related to sale of future royalties	(1,035)	(1,062)
Total	6,097	5,755
Amortization of deferred financing costs and debt discount	$ 4,287	$ 4,061

Commitments and Contingencies (

Commitments and Contingencies (Details) € in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2021EUR (€)	Sep. 30, 2014USD ($)
Long-term Purchase Commitment [Line Items]
Nonrecourse liability related to sale of future royalties, long term				$ 30
MDD US Enterprises LLC (Formerly USWM Enterprises)
Long-term Purchase Commitment [Line Items]
Payment to resolve U.S. Department of Justice allegations	$ 17.5
MDD US Enterprises LLC (Formerly USWM Enterprises)
Long-term Purchase Commitment [Line Items]
Annual minimum purchase quantity requirement amount | €			€ 3
Commitment period		5 years
Spend commitment amount		$ 2.4
Spend commitment amount, current period		$ 0.4