Commitments and Contingencies	6 Months Ended
Jun. 30, 2026
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 the product candidates in the Company's CNS portfolio. 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, ONAPGO, 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. The royalty expense incurred for these acquired products is recognized as Cost of revenues in the condensed consolidated statements of earnings (loss). Through the Sage Acquisition, the Company acquired licensing agreements with other pharmaceutical companies for ZURZUVAE (zuranolone). See Note 15, Collaboration Agreements for further details. Navitor Development Agreement and Asset Purchase Agreement In April 2020, the Company entered into a development agreement (Development Agreement) with Navitor Pharmaceuticals, Inc. (Navitor Inc.). The Company agreed to bear certain Phase I and Phase II development costs incurred by either party, up to a maximum of $50 million, which amount could be increased under the terms of the Development Agreement upon Navitor's request and the Company's consent. In 2020, the Company paid a one-time, nonrefundable, and non-creditable fee of $10 million for the option to acquire or license NV-5138 (SPN-820) (Purchase Option) and made a $15 million equity investment representing approximately 13% ownership in Navitor Inc. The Company acquired Series D Preferred Shares of Navitor Inc. (the Navitor Shares), an equity investment representing an approximately 13% ownership position in Navitor Inc. As part of a legal restructuring in March 2021, the Company's Navitor Shares were exchanged for membership interests in Navitor Pharmaceutics LLC (Navitor LLC), which became the sole shareholder of Navitor Inc. The Company determined that although Navitor LLC was a VIE, the Company did not consolidate the results of this VIE into its financial results because the Company lacked the power to direct the activities that most significantly impact Navitor's economic performance. On April 1, 2026, the Company entered into an Asset Purchase Agreement (APA) with Navitor and consummated the transactions contemplated therein whereby the Company acquired, among other things, the right, title, materials, and intellectual property of SPN-820. The transaction included no upfront cash payment, however, the Company is obligated to effect and complete one Phase 2b study and make several milestone payments of up to $350 million contingent upon the achievement of specified development, regulatory and commercial milestones. The Company accounted for the transaction as an asset purchase under ASC 805 Business Combinations. The Company accounted for the contingent milestone payments under ASC 450 Contingencies. As such, no contingent liability was recognized as the contingent milestones were deemed not probable of achievement as of April 1, 2026 and June 30, 2026. The Company retains its 13% equity ownership in Navitor LLC. The Company determined Navitor LLC no longer meets the criteria to be considered a VIE. The Company continues to record its share of the results of Navitor LLC, a private company, on a quarter lag as the financial information of Navitor LLC is not available on a sufficiently timely basis for the Company to apply the equity method of accounting. Other than as described herein, no additional equity investment has been made or financing has been provided to Navitor Inc. or Navitor LLC. USWM Enterprise Commitments Assumed As part of the USWM Acquisition, the Company assumed the remaining commitments of USWM Enterprises and its subsidiaries, which included an annual minimum purchase requirement of MYOBLOC under the contract manufacturing agreement with Merz for manufacture and supply. An amendment to the contract manufacturing agreement with Merz was executed in July 2025. Amendments to the contract manufacturing agreement included among other things, the removal of the annual minimum purchase requirement of MYOBLOC, and the Company's agreement to pay a nonrefundable annual fee of €3.0 million to cover general maintenance and reservation costs for the manufacturing facilities. Biscayne Amendment On January 22, 2026, the Company entered into a First Amendment (Amendment) to the Agreement and Plan of Merger (Agreement) dated September 12, 2018, with former Biscayne security holders. The Amendment relates to the timing and payment of certain milestones under the Biscayne merger agreement. The Company agreed to pay former Biscayne security holders $10.0 million, one of the milestones specified in the Agreement, by June 30, 2026. The Company accrued for the liability in Other current liabilities on the condensed consolidated balance sheets as of March 31, 2026. The Company subsequently paid the Biscayne security holders in June 2026. The amount is recorded in Research and development expense on the condensed consolidated statements of earnings (loss) for the six months ended June 30, 2026. Claims and Litigation From time to time, any of Supernus Pharmaceuticals, Inc. or one or more of its subsidiaries may be involved in various claims, litigation, legal proceedings, and governmental and regulatory investigations. These matters may involve patent litigation, product liability, product-related litigation, securities law-related litigation, commercial and other matters, and government investigations, among others. On a quarterly basis, the Company reviews the status of each significant matter and assesses its potential financial exposure. If the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated, the Company will accrue a liability for the estimated loss. Because of uncertainties related to claims, legal proceedings and litigation, accruals will be based on the Company's best estimates based on available information. The Company may reassess the potential liability related to these matters and may revise these estimates. The process of resolving matters through litigation or other means is inherently uncertain and it is possible that an unfavorable resolution of these matters will adversely affect the Company, its results of operations, financial condition and cash flows. APOKYN Litigation On October 3, 2022, Sage Chemical, Inc. and TruPharma, LLC filed a lawsuit in the United States District Court for the District of Delaware alleging that Supernus Pharmaceuticals, Inc., Britannia Pharmaceuticals Limited (Britannia), and US WorldMeds Partners, LLC (US WorldMeds) violated state and federal antitrust law in connection with APOKYN® (apomorphine HCl). On October 16, 2022, Plaintiffs amended their complaint to add additional defendants MDD US Enterprises, LLC, MDD US Operations, LLC (each a subsidiary of Supernus Pharmaceuticals, Inc.), USWM, LLC (USWM), and individual defendants Paul Breckinridge Jones, Sr., Herbert Lee Warren, Jr., Henry Van Den Berg, and Kristin L. Gullo. On January 10, 2023, Defendants filed an Omnibus Motion to Dismiss the Amended Complaint seeking dismissal of each of Plaintiffs’ claims and the lawsuit in its entirety and US WorldMeds with USWM, Britannia, and the group of individual defendants each filed separate motions to dismiss. On May 9, 2024, and May 28, 2024, respectively, the Court denied the Defendants’ omnibus motion and the Britannia motion to dismiss. On May 31, 2024, and June 4, 2024, respectively, the Court granted the individual defendants’ motion to dismiss and the US WorldMeds and USWM motion to dismiss. On December 6, 2024, Plaintiffs filed a second amended complaint, which added US WorldMeds and USWM back to the case. On February 9, 2026, the Court issued a scheduling order that provided for the close of expert discovery on May 8, 2026, and the submission of dispositive motions by June 9, 2026, with briefing to be completed on September 2, 2026. On June 9, 2026, each side submitted both dispositive motions and motions to exclude certain expert opinions, which are currently being briefed. The scheduling order also sets a pretrial conference on January 15, 2027, and a jury trial beginning on January 25, 2027. The Company intends to defend itself vigorously. However, the Company can offer no assurances that it will be successful in a litigation. Sage Legal Proceedings Merger Complaints In connection with the Sage Merger Agreement and Sage's Board of Directors' (Sage Board) recommendation to Sage shareholders to tender their shares pursuant to the tender offer, two purported Sage shareholders filed complaints in state court against Sage and each member of the Sage Board. Among other things, the complaints assert claims for negligent misrepresentation and concealment and negligence under New York common law. Sage has also received certain demand letters from other purported shareholders with similar allegations to those contained in the complaints. Additional demand letters may be received by Sage and additional complaints may be filed against Sage, the Sage Board, Supernus and Saphire, Inc. in connection with the Sage Merger Agreement and tender offer. Securities Class Action On August 28, 2024, named plaintiff Darren Korver filed a purported federal securities class action lawsuit in the Southern District of New York against Sage and individuals, Barry E. Greene and Kimi Iguchi (Securities Class Action). The complaint in the Securities Class Action alleges violations of U.S. securities laws under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder and seeks an as-yet unspecified amount of damages allegedly sustained by parties who purchased Sage stock between April 12, 2021 and July 23, 2024, as well as applicable attorneys’ fees and costs. On April 17, 2025, Sage Therapeutics, along with all of the individual defendants, filed a motion to dismiss the Securities Class Action in the Southern District of New York. On February 18, 2026, Plaintiffs filed a letter with the Court seeking leave to amend their complaint and asking the Court to refrain from deciding the motion to dismiss pending the Court’s decision on the request to file an amended complaint. On March 10, 2026, Defendants submitted a letter to the Court joining Plaintiffs’ request of February 18, 2026. On April 3, 2026, the parties filed a stipulation, which the Court so ordered on April 9, 2026, permitting Plaintiffs to file an amended complaint by July 15, 2026. On April 30, 2026, Plaintiffs filed the Second Amended Complaint. On July 15, 2026, Defendants filed a motion to dismiss the Second Amended Complaint. Lead Plaintiffs’ opposition to the motion to dismiss is due by August 31, 2026, and Defendants’ reply in further support of their motion is due by September 22, 2026. Related derivative actions remain stayed pending the resolution of this motion. Sage denies any allegations of wrongdoing and intends to vigorously defend against the Securities Class Action. U.S. Securities and Exchange Commission (SEC) Investigation On October 16, 2024, Sage received a subpoena from the Enforcement Division of the SEC requesting documents and information related to Sage’s NDA for zuranolone for the treatment of MDD, including communications with the FDA and any communications containing material nonpublic information. The Company is cooperating with the SEC and intends to continue to provide information responsive to the SEC’s requests. Consolidated Derivative Litigations On March 26, 2025, plaintiff shareholder Qingping Zhu commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage, against sixteen current and former officers and directors of Sage (the Zhu Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Zhu Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief. On April 14, 2025, the Southern District of New York granted a stay of the Zhu Derivative Litigation pending the resolution of the motion to dismiss the amended complaint in the Securities Class Action. On May 13, 2025, plaintiff shareholder Jurgen Matton commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage Therapeutics, against sixteen current and former officers and directors of Sage Therapeutics (the Matton Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Matton Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief. On May 22, 2025, plaintiff shareholder Joseph Pizzelanti commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage Therapeutics, against sixteen current and former officers and directors of the Company (the Pizzelanti Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Pizzelanti Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief. On June 20, 2025, Sage, along with other relevant parties, submitted for the Southern District of New York’s approval of a consolidation of the Zhu Derivative Litigation with the Matton Derivative Litigation and the Pizzelanti Derivative Litigation (the Consolidated Derivative Litigation). At this time, the Company is unable to predict the outcome of the Merger Complaints, Securities Class Action, the SEC investigation, or the Consolidated Derivative Litigation, or reasonably estimate a range of possible losses. The outcome of the matters described above cannot be predicted with certainty.

The Company has obtained exclusive licenses from third parties for proprietary rights to support the product candidates in the Company's CNS portfolio. 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, ONAPGO, 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. The royalty expense incurred for these acquired products is recognized as Cost of revenues in the condensed consolidated statements of earnings (loss).

In April 2020, the Company entered into a development agreement (Development Agreement) with Navitor Pharmaceuticals, Inc. (Navitor Inc.). The Company agreed to bear certain Phase I and Phase II development costs incurred by either party, up to a maximum of $50 million, which amount could be increased under the terms of the Development Agreement upon Navitor's request and the Company's consent. In 2020, the Company paid a one-time, nonrefundable, and non-creditable fee of $10 million for the option to acquire or license NV-5138 (SPN-820) (Purchase Option) and made a $15 million equity investment representing approximately 13% ownership in Navitor Inc. The Company acquired Series D Preferred Shares of Navitor Inc. (the Navitor Shares), an equity investment representing an approximately 13% ownership position in Navitor Inc. As part of a legal restructuring in March 2021, the Company's Navitor Shares were exchanged for membership interests in Navitor Pharmaceutics LLC (Navitor LLC), which became the sole shareholder of Navitor Inc. The Company determined that although Navitor LLC was a VIE, the Company did not consolidate the results of this VIE into its financial results because the Company lacked the power to direct the activities that most significantly impact Navitor's economic performance.

On April 1, 2026, the Company entered into an Asset Purchase Agreement (APA) with Navitor and consummated the transactions contemplated therein whereby the Company acquired, among other things, the right, title, materials, and intellectual property of SPN-820. The transaction included no upfront cash payment, however, the Company is obligated to effect and complete one Phase 2b study and make several milestone payments of up to $350 million contingent upon the achievement of specified development, regulatory and commercial milestones. The Company accounted for the transaction as an asset purchase under ASC 805 Business Combinations. The Company accounted for the contingent milestone payments under ASC 450 Contingencies. As such, no contingent liability was recognized as the contingent milestones were deemed not probable of achievement as of April 1, 2026 and June 30, 2026. The Company retains its 13% equity ownership in Navitor LLC. The Company determined Navitor LLC no longer meets the criteria to be considered a VIE. The Company continues to record its share of the results of Navitor LLC, a private company, on a quarter lag as the financial information of Navitor LLC is not available on a sufficiently timely basis for the Company to apply the equity method of accounting.

As part of the USWM Acquisition, the Company assumed the remaining commitments of USWM Enterprises and its subsidiaries, which included an annual minimum purchase requirement of MYOBLOC under the contract manufacturing agreement with Merz for manufacture and supply. An amendment to the contract manufacturing agreement with Merz was executed in July 2025. Amendments to the contract manufacturing agreement included among other things, the removal of the annual minimum purchase requirement of MYOBLOC, and the Company's agreement to pay a nonrefundable annual fee of €3.0 million to cover general maintenance and reservation costs for the manufacturing facilities.

On January 22, 2026, the Company entered into a First Amendment (Amendment) to the Agreement and Plan of Merger (Agreement) dated September 12, 2018, with former Biscayne security holders. The Amendment relates to the timing and payment of certain milestones under the Biscayne merger agreement. The Company agreed to pay former Biscayne security holders $10.0 million, one of the milestones specified in the Agreement, by June 30, 2026. The Company accrued for the liability in Other current liabilities on the condensed consolidated balance sheets as of March 31, 2026. The Company subsequently paid the Biscayne security holders in June 2026. The amount is recorded in Research and development expense on the condensed consolidated statements of earnings (loss) for the six months ended June 30, 2026.

From time to time, any of Supernus Pharmaceuticals, Inc. or one or more of its subsidiaries may be involved in various claims, litigation, legal proceedings, and governmental and regulatory investigations. These matters may involve patent litigation, product liability, product-related litigation, securities law-related litigation, commercial and other matters, and government investigations, among others. On a quarterly basis, the Company reviews the status of each significant matter and assesses its potential financial exposure. If the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated, the Company will accrue a liability for the estimated loss. Because of uncertainties related to claims, legal proceedings and litigation, accruals will be based on the Company's best estimates based on available information. The Company may reassess the potential liability related to these matters and may revise these estimates. The process of resolving matters through litigation or other means is inherently uncertain and it is possible that an unfavorable resolution of these matters will adversely affect the Company, its results of operations, financial condition and cash flows.

On October 3, 2022, Sage Chemical, Inc. and TruPharma, LLC filed a lawsuit in the United States District Court for the District of Delaware alleging that Supernus Pharmaceuticals, Inc., Britannia Pharmaceuticals Limited (Britannia), and US WorldMeds Partners, LLC (US WorldMeds) violated state and federal antitrust law in connection with APOKYN® (apomorphine HCl). On October 16, 2022, Plaintiffs amended their complaint to add additional defendants MDD US Enterprises, LLC, MDD US Operations, LLC (each a subsidiary of Supernus Pharmaceuticals, Inc.), USWM, LLC (USWM), and individual defendants Paul Breckinridge Jones, Sr., Herbert Lee Warren, Jr., Henry Van Den Berg, and Kristin L. Gullo. On January 10, 2023, Defendants filed an Omnibus Motion to Dismiss the Amended Complaint seeking dismissal of each of Plaintiffs’ claims and the lawsuit in its entirety and US WorldMeds with USWM, Britannia, and the group of individual defendants each filed separate motions to dismiss. On May 9, 2024, and May 28, 2024, respectively, the Court denied the Defendants’ omnibus motion and the Britannia motion to dismiss. On May 31, 2024, and June 4, 2024, respectively, the Court granted the individual defendants’ motion to dismiss and the US WorldMeds and USWM motion to dismiss. On December 6, 2024, Plaintiffs filed a second amended complaint, which added US WorldMeds and USWM back to the case. On February 9, 2026, the Court issued a scheduling order that provided for the close of expert discovery on May 8, 2026, and the submission of dispositive motions by June 9, 2026, with briefing to be completed on September 2, 2026. On June 9, 2026, each side submitted both dispositive motions and motions to exclude certain expert opinions, which are currently being briefed. The scheduling order also sets a pretrial conference on January 15, 2027, and a jury trial beginning on January 25, 2027.

In connection with the Sage Merger Agreement and Sage's Board of Directors' (Sage Board) recommendation to Sage shareholders to tender their shares pursuant to the tender offer, two purported Sage shareholders filed complaints in state court against Sage and each member of the Sage Board. Among other things, the complaints assert claims for negligent misrepresentation and concealment and negligence under New York common law. Sage has also received certain demand letters from other purported shareholders with similar allegations to those contained in the complaints. Additional demand letters may be received by Sage and additional complaints may be filed against Sage, the Sage Board, Supernus and Saphire, Inc. in connection with the Sage Merger Agreement and tender offer.

On August 28, 2024, named plaintiff Darren Korver filed a purported federal securities class action lawsuit in the Southern District of New York against Sage and individuals, Barry E. Greene and Kimi Iguchi (Securities Class Action). The complaint in the Securities Class Action alleges violations of U.S. securities laws under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder and seeks an as-yet unspecified amount of damages allegedly sustained by parties who purchased Sage stock between April 12, 2021 and July 23, 2024, as well as applicable attorneys’ fees and costs. On April 17, 2025, Sage Therapeutics, along with all of the individual defendants, filed a motion to dismiss the Securities Class Action in the Southern District of New York.

On February 18, 2026, Plaintiffs filed a letter with the Court seeking leave to amend their complaint and asking the Court to refrain from deciding the motion to dismiss pending the Court’s decision on the request to file an amended complaint. On March 10, 2026, Defendants submitted a letter to the Court joining Plaintiffs’ request of February 18, 2026. On April 3, 2026, the parties filed a stipulation, which the Court so ordered on April 9, 2026, permitting Plaintiffs to file an amended complaint by July

15, 2026. On April 30, 2026, Plaintiffs filed the Second Amended Complaint. On July 15, 2026, Defendants filed a motion to dismiss the Second Amended Complaint. Lead Plaintiffs’ opposition to the motion to dismiss is due by August 31, 2026, and Defendants’ reply in further support of their motion is due by September 22, 2026. Related derivative actions remain stayed pending the resolution of this motion.

On October 16, 2024, Sage received a subpoena from the Enforcement Division of the SEC requesting documents and information related to Sage’s NDA for zuranolone for the treatment of MDD, including communications with the FDA and any communications containing material nonpublic information. The Company is cooperating with the SEC and intends to continue to provide information responsive to the SEC’s requests.

On March 26, 2025, plaintiff shareholder Qingping Zhu commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage, against sixteen current and former officers and directors of Sage (the Zhu Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Zhu Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief. On April 14, 2025, the Southern District of New York granted a stay of the Zhu Derivative Litigation pending the resolution of the motion to dismiss the amended complaint in the Securities Class Action.

On May 13, 2025, plaintiff shareholder Jurgen Matton commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage Therapeutics, against sixteen current and former officers and directors of Sage Therapeutics (the Matton Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Matton Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief.

On May 22, 2025, plaintiff shareholder Joseph Pizzelanti commenced derivative litigation in the Southern District of New York, purportedly on behalf of Sage Therapeutics, against sixteen current and former officers and directors of the Company (the Pizzelanti Derivative Litigation). Based significantly on the allegations underlying the Securities Class Action, the Pizzelanti Derivative Litigation alleges violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder, breaches of fiduciary duty, unjust enrichment, and waste of corporate assets, and seeks unspecified damages and various equitable relief.