UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
(Exact name of registrant as specified in its charter)
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(State or other jurisdiction |
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| (IRS Employer |
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Registrant’s telephone number, including area code: (
N/A
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Securities registered pursuant to Section 12(b) of the Act:
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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
On June 24, 2025 Rhythm Pharmaceuticals, Inc. (the “Company”) held its Annual Meeting of Stockholders (the “Annual Meeting”). At the Annual Meeting, the Company’s stockholders approved an amendment to the Company’s Amended and Restated Certificate of Incorporation (the “Amendment”), which had previously been adopted by the Company’s Board of Directors (the “Board”) subject to stockholder approval at the Annual Meeting. The Amendment updates the exculpation provision with respect to certain officers of the Company as permitted by recent amendments to the General Corporation Law of the State of Delaware.
A description of the Amendment is included in Proposal No. 4 of the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 29, 2025 (the “Definitive Proxy Statement”), which description is incorporated herein by reference.
As a result, the Company filed a Certificate of Amendment to the Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware on June 25, 2025, which became effective upon filing (the “Certificate of Amendment”).
The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Certificate of Amendment, which is filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.
Item 5.07. Submission of Matters to a Vote of Security Holders.
At the close of business on the April 28, 2025 record date (the “Record Date”) for the Annual Meeting, there were (i) 63,597,942 shares of the Company’s common stock outstanding, of which each share of common stock was entitled to one vote; and (ii) 150,000 shares of the Company’s Series A convertible preferred stock (“Convertible Preferred Stock”) outstanding, of which 90,000 shares were entitled to vote (each share of Convertible Preferred Stock being entitled to a number of votes equal to 20.8333 shares of common stock per $1,000 liquidation preference of Series A convertible preferred stock). As a result, there were a total of 65,472,938 eligible votes as of the record date. A total of 60,718,627 votes were present online or represented by proxy at the Annual Meeting, representing approximately 92.74% of the total eligible votes as of the Record Date. The following are the voting results for the proposals considered and voted upon at the meeting, all of which were described in the Definitive Proxy Statement.
Item 1 - Election of two Class II Directors to serve until the 2028 Annual Meeting of Stockholders, and until their respective successors have been duly elected and qualified.
NOMINEE |
| Votes FOR |
| Votes WITHHELD |
| Broker Non-Votes | |||
Jennifer Good | 55,565,432 | 3,393,257 | 1,759,938 | ||||||
Edward T. Mathers | 35,169,176 | 23,789,513 | 1,759,938 | ||||||
Item 2 - Ratification of the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2025.
Votes FOR |
| Votes AGAINST |
| Votes ABSTAINED |
| Broker Non-Votes | |||
60,554,577 | 158,123 | 5,927 | 0 | ||||||
Item 3 - Approval, on an advisory (non-binding) basis, of the compensation of the Company’s named executive officers.
Votes FOR |
| Votes AGAINST |
| Votes ABSTAINED |
| Broker Non-Votes | |||
40,890,846 | 18,057,763 | 10,080 | 1,759,938 | ||||||
Item 4 – Approval of an amendment to our Amended and Restated Certificate of Incorporation to provide for exculpation of officers from breaches of fiduciary duty to the fullest extent permitted by the General Corporation Law of the State of Delaware (the “Officer Exculpation Amendment”).
Votes FOR |
| Votes AGAINST |
| Votes ABSTAINED |
| Broker Non-Votes | |||
55,466,440 | 3,483,935 | 8,314 | 1,759,938 | ||||||
Item 5 – Approval of an adjournment of the Annual Meeting, if necessary, to solicit additional proxies if there are not sufficient votes at the time of the Annual Meeting to approve the Officer Exculpation Amendment.
Votes FOR |
| Votes AGAINST |
| Votes ABSTAINED |
| Broker Non-Votes | |||
52,278,219 | 6,673,470 | 7,000 | 1,759,938 | ||||||
Based on the foregoing votes, Jennifer Good and Edward T. Mathers were elected as Class II Directors, and Items 2, 3, 4 and 5 were approved.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits
Exhibit | ||
No. | Description | |
3.1 | ||
104 | Cover Page Interactive Data File (embedded within the inline XBRL document) |
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| RHYTHM PHARMACEUTICALS, INC. | |
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Date: June 26, 2025 | By: | /s/ Hunter Smith |
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| Hunter Smith |
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| Chief Financial Officer |
Exhibit 3.1
AMENDED AND RESTATED
CERTIFICATE OF INCORPORATION OF
RHYTHM PHARMACEUTICALS, INC.
Rhythm Pharmaceuticals, Inc., a corporation organized and existing under the laws of the State of Delaware (the “Corporation”), DOES HEREBY CERTIFY:
FIRST:The name of the Corporation is “Rhythm Pharmaceuticals, Inc.” The date of filing the original Certificate of Incorporation of the Corporation with the Secretary of State of the State of Delaware was February 26, 2013 under the name “Rhythm Metabolic, Inc.”.
SECOND:This Amended and Restated Certificate of Incorporation (this “Restated Certificate”) has been duly approved by the Board of Directors of the Corporation.
THIRD:This Restated Certificate has been duly adopted by the stockholders of the Corporation in accordance with the provisions of Sections 228, 242 and 245 of the General Corporation Law of the State of Delaware (the “DGCL”), and notice thereof has been given in accordance with the provisions of Section 228 of the DGCL.
FOURTH:The Certificate of Incorporation of this Corporation is hereby amended, integrated and restated to read as follows:
ARTICLE ONE
The name of the Corporation is Rhythm Pharmaceuticals, Inc.
ARTICLE TWO
The address of the Corporation’s registered office is 251 Little Falls Drive, in the City of Wilmington, New Castle County, Delaware 19808. The name of the registered agent at such address is Corporation Service Company.
ARTICLE THREE
The nature of the business or purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the DGCL.
ARTICLE FOUR
Section 1. Authorized Shares. The total number of shares of all classes of capital stock which the
Corporation shall have authority to issue is One Hundred Thirty Million (130,000,000) shares, consisting of:
Such stock may be issued from time to time by the Corporation for such consideration as may be fixed by the board of directors of the Corporation (the “Board of Directors”). The following is a statement of the powers, designations, preferences, privileges, and relative rights in respect of each class of capital stock of the Corporation.
Section 2. Common Stock.
Section 3. Preferred Stock. To the fullest extent authorized by the DGCL, shares of Preferred Stock may be issued from time to time in one or more series, each of such series to have such powers, designations, preferences, and relative, participating, optional, or other special rights, if any, and such qualifications and restrictions, if any, as are stated or expressed in the resolution or resolutions of the Board of Directors providing for such series of Preferred Stock. Different series of Preferred Stock shall not be construed to constitute different classes of shares for the purposes of voting by classes unless expressly so provided in such resolution or resolutions.
Authority is hereby granted to the Board of Directors, acting by resolution or resolutions adopted at any time and from time to time, to create, provide for, designate and issue, out of the authorized but unissued shares of Preferred Stock, one or more series of Preferred Stock, and, in connection with the creation of any such series of Preferred Stock, to determine and fix the powers, designations, preferences, and relative, participating, optional, or other special rights, if any, and the qualifications and restrictions, if any, including without limitation dividend rights, conversion rights, voting rights (if any), redemption privileges, and liquidation preferences, of such series of Preferred Stock (which need not be uniform among series), all to the fullest extent now or hereafter permitted by the DGCL. Without limiting the generality of the foregoing, the resolution or resolutions providing for the creation or
issuance of any series of Preferred Stock may provide that such series shall be superior to, rank equally with, or be junior to any other series of Preferred Stock, all to the fullest extent permitted by law. No resolution, vote, or consent of the holders of the capital stock of the Corporation shall be required in connection with the creation or issuance of any shares of any series of Preferred Stock authorized by and complying with the conditions of this Restated Certificate, the right to any such resolution, vote, or consent being expressly waived by all present and future holders of the capital stock of the Corporation.
Any resolution or resolutions adopted by the Board of Directors pursuant to the authority vested in them by this Section 3 of Article Four shall be set forth in a certificate of designation along with the number of shares of such series of Preferred Stock as to which the resolution or resolutions shall apply and such certificate shall be executed, acknowledged, filed, recorded, and shall become effective, in accordance with Section 103 of the DGCL. Unless otherwise provided in any such resolution or resolutions, the number of shares of any such series of Preferred Stock to which such resolution or resolutions apply may be increased (but not above the total number of authorized shares of Preferred Stock) or decreased (but not below the number of shares of such series of Preferred Stock then outstanding) by a certificate likewise executed, acknowledged, filed and recorded, setting forth a statement that a specified increase or decrease therein has been authorized and directed by a resolution or resolutions likewise adopted by the Board of Directors. In case the number of such shares shall be decreased, the number of shares so specified in the certificate shall resume the status which they had prior to the adoption of the first resolution or resolutions. When no shares of any such series of Preferred Stock are outstanding, either because none were issued or because none remain outstanding, a certificate setting forth a resolution or resolutions adopted by the Board of Directors that none of the authorized shares of such series of Preferred Stock are outstanding, and that none will be issued subject to the certificate of designations previously filed with respect to such series of Preferred Stock, may be executed, acknowledged, filed and recorded in the same manner as previously described and it shall have the effect of eliminating from this Restated Certificate all matters set forth in the certificate of designations with respect to such series of Preferred Stock. If no shares of any such series of Preferred Stock established by a resolution or resolutions adopted by the Board of Directors have been issued, the voting powers, designations, preferences and relative, participating, optional or other rights, if any, with the qualifications, limitations or restrictions thereof, may be amended by a resolution or resolutions adopted by the Board of Directors. In the event of any such amendment, a certificate which (i) states that no shares of such series of Preferred Stock have been issued, (ii) sets forth the copy of the amending resolution or resolutions and (iii) if the designation of such series of Preferred Stock is being changed, indicates the original designation and the new designation, shall be executed, acknowledged, filed, recorded, and shall become effective, in accordance with Section 103 of the DGCL.
ARTICLE FIVE
The Corporation is to have perpetual existence.
ARTICLE SIX
Section 1. Classification of Directors. Effective as of the closing (the “IPO Closing”) of the Corporation’s first public offering of shares of Common Stock registered pursuant to the Securities Act of 1933, as amended, the Board of Directors shall be divided into three classes of directors, Class I, Class II, and Class III, such classes to be as nearly equal in number of directors as possible, having staggered three-year terms of office (except to the extent otherwise provided in the next sentence with respect to the initial terms of such classes of directors). The initial term of office of the directors of Class I shall expire as of the first annual meeting of the Corporation’s stockholders following the IPO Closing; the initial term of office of the directors of Class II shall expire as of the second annual meeting of the Corporation’s stockholders following the IPO Closing; and the initial term of office of the directors of Class III shall expire as of the third annual meeting of the Corporation’s stockholders following the IPO Closing. At each annual meeting of stockholders of the Corporation after the IPO Closing, nominees will stand for election to succeed those directors whose terms are to expire as of such annual meeting of stockholders, and such nominees
elected at such annual meeting of stockholders shall be elected for a term expiring at the third annual meeting of stockholders following their election. Directors shall hold office until the annual meeting of stockholders in which their term is scheduled to expire as set forth above in this Section 1 of Article Six and until their respective successors are duly elected or qualified or until their earlier death, incapacity, resignation or removal. Those directors already in office immediately prior to the IPO Closing shall be allocated among the three classes of directors contemplated under this Section 1 of Article Six pursuant to a resolution or resolutions adopted by the Board of Directors prior to the IPO Closing.
Section 2. Removal. Subject to the special rights of the holders of any series of Preferred Stock to elect directors, the directors of the Corporation may be removed only for cause by the affirmative vote of the holders of at least seventy-five percent (75%) of the outstanding shares of capital stock of the Corporation entitled to vote in the election of directors or class of directors, voting together as a single class, at a meeting of the stockholders called for that purpose.
Section 3. Vacancies. Except as the DGCL may otherwise require, any new directorships or vacancies in the Board of Directors, including new directorships resulting from any increase in the number of directors to serve in the Board of Directors and/or any unfilled vacancies by reason of death, resignation, disqualification, removal for cause, failure to elect or otherwise with respect to any director, may be filled only by the vote of a majority of the remaining directors then in office, although less than a quorum, or by the sole remaining director.
Section 4. Number of Directors. Subject to the special rights of the holders of any series of Preferred Stock to elect directors, the number of directors which shall constitute the Board of Directors shall be fixed exclusively by the Board of Directors from time to time in accordance with the by-laws of the Corporation. No decrease in the number of directors constituting the whole board shall shorten the term of any incumbent director.
ARTICLE SEVEN
The Board of Directors shall have the power and authority: (i) to adopt, amend or repeal the Corporation’s by-laws, subject to the power of the stockholders of the Corporation entitled to vote with respect thereto to make, alter, amend or repeal the by-laws; provided, that with respect to the powers of stockholders entitled to vote with respect thereto to make, alter, amend or repeal the by-laws, in addition to any other vote otherwise required by law, the affirmative vote of the holders of at least seventy-five percent (75%) of the outstanding shares of capital stock of the Corporation entitled to vote in the election of directors or class of directors, voting together as a single class, shall be required to make, alter, amend or repeal the by-laws of the Corporation; and (ii) to the full extent permitted or not prohibited by law, and without the consent of or other action by the stockholders, to authorize or create mortgages, pledges or other liens or encumbrances upon any or all of the assets, real, personal or mixed, and franchises of the Corporation, including after-acquired property, and to exercise all of the powers of the Corporation in connection therewith.
ARTICLE EIGHT
Except as otherwise provided for by any resolutions of the Board of Directors providing for the issuance of any series of Preferred Stock, effective as of the IPO Closing, any action required or permitted to be taken by the stockholders of the Corporation may be taken only at a duly called annual or special meeting of the stockholders in which such action is properly brought before such meeting, and not by written consent in lieu of such a meeting. Subject to any special rights of the holders of any series of Preferred Stock, and to the requirements of applicable law, special meetings of stockholders of the Corporation may be called only by or at the direction of the Board of Directors pursuant to a resolution adopted by a majority of the total number of directors. Any business transacted at any special meeting of stockholders shall be limited to matters relating to the purpose or purposes stated in the notice of meeting
ARTICLE NINE
The Corporation reserves the right to amend, alter, change or repeal any provision contained in this Restated Certificate, in the manner now or hereafter prescribed by the DGCL, and all rights conferred upon stockholders herein are granted subject to this reservation. Notwithstanding anything to the contrary contained in this Restated Certificate, and notwithstanding that a lesser percentage may be permitted from time to time by applicable law, the affirmative vote of the holders of at least seventy-five percent (75%) of the outstanding shares of capital stock of the Corporation entitled to vote in the election of directors or class of directors, voting together as a single class (in addition to any separate class vote that may in the future be required pursuant to the terms of any outstanding Preferred Stock), shall be required to amend or repeal the provisions of Articles Four (only to the extent it relates to the authority of the Board of Directors to issue shares of Preferred Stock in one or more series, the terms of which may be determined by the Board of Directors), Six, Seven, Eight, Nine, Ten, or Eleven of this Restated Certificate or to reduce the numbers of authorized shares of Common Stock or Preferred Stock.
ARTICLE TEN
Section 1. Limitation of Liability. To the fullest extent permitted by the DGCL as it now exists or may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the Corporation to provide broader indemnification rights than permitted prior thereto), no director of the Corporation shall be personally liable to the Corporation or to any of its stockholders for monetary damages for breach of fiduciary duty as a director, notwithstanding any provision of law imposing such liability; provided, however, that to the extent required from time to time by applicable law, this Article Ten shall not eliminate or limit the liability of a director, to the extent such liability is provided by applicable law, (i) for any breach of the director’s duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL, or (iv) for any transactions from which the director derived an improper personal benefit.
Section 2. Indemnification. The Corporation shall, to the fullest extent permitted by Section 145 of the DGCL and as further provided in the Corporation’s by-laws, each as amended from time to time, indemnify each person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative, by reason of the fact that such person is or was, or has agreed to become, a director or officer of the Corporation, or is or was serving, or has agreed to serve, at the request of the Corporation, as a director, officer or trustee of, or in a similar capacity with, another corporation, partnership, joint venture, trust or other enterprise (including any employee benefit plan), or by reason of any action alleged to have been taken or omitted in such capacity, against all expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him or her or on his or her behalf in connection with such action, suit or proceeding and any appeal therefrom.
Indemnification may include payment by the Corporation of expenses in defending an action or proceeding in advance of the final disposition of such action or proceeding upon receipt of an undertaking by the person indemnified to repay such payment if it is ultimately determined that such person is not entitled to indemnification under this Article Ten, which undertaking may be accepted without reference to the financial ability of such person to make such repayment.
The Corporation shall not indemnify any such person seeking indemnification in connection with a proceeding (or part thereof) initiated by such person unless the initiation thereof was approved by the Board of Directors or except and to the extent otherwise permitted in the Corporation’s by-laws or in an agreement between the Corporation and such person.
The indemnification rights provided in this Article Ten (i) shall not be deemed exclusive of any other rights to which those indemnified may be entitled under the Corporation’s by-laws, any law, agreement or vote of
stockholders or disinterested directors or otherwise, and (ii) shall inure to the benefit of the heirs, executors and administrators of such persons. The Corporation may, to the extent authorized from time to time by its Board of Directors, grant indemnification rights to other employees or agents of the Corporation or other persons serving the Corporation and such rights may be equivalent to, or greater or less than, those set forth in this Article Ten.
Section 3. Merger or Consolidation. For purposes of this Article Ten, references to the “Corporation” shall include, in addition to the resulting corporation, any constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger which, if its separate existence had continued, would have had power and authority to indemnify its directors, officers and employees or agents, so that any person who is or was a director, officer, employee or agent of such constituent corporation, or is or was serving at the request of such constituent corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, shall stand in the same position under this Article Ten with respect to the resulting or surviving corporation as he or she would have with respect to such constituent corporation if its separate existence had continued.
Section 4. Amendment or Repeal. No amendment to or repeal of this Article Ten shall apply to or have any effect on the liability or alleged liability of any director for or with respect to any acts or omissions of such director occurring prior to the effective date of such amendment or repeal.
ARTICLE ELEVEN
Unless the Corporation, as authorized by the Board of Directors, consents in writing to the selection of one or more alternative forums, the Court of Chancery of the State of Delaware shall be the sole and exclusive forum for a stockholder (including a beneficial owner) to bring (i) any derivative action or proceeding brought on behalf of the Corporation, (ii) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee of the Corporation to the Corporation or the Corporation’s stockholders, (iii) any action asserting a claim against the Corporation arising pursuant to any provision of the DGCL or this Restated Certificate or the Corporation’s by-laws or (iv) any action asserting a claim against the Corporation, its directors, officers or employees governed by the internal affairs doctrine. Any person or entity purchasing or otherwise acquiring any interest in shares of capital stock of the Corporation (including, without limitation, shares of Common Stock) shall, and shall be deemed to, have notice of and to have consented to the provisions of this Article Eleven.
ARTICLE TWELVE
If any provision or provisions of this Restated Certificate shall be held to be invalid, illegal or unenforceable as applied to any circumstance for any reason whatsoever: (i) the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Restated Certificate (including, without limitation, each portion of any paragraph of this Restated Certificate containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and (ii) to the fullest extent possible, the provisions of this Restated Certificate (including, without limitation, each such portion of any paragraph of this Restated Certificate containing any such provision held to be invalid, illegal or unenforceable) shall be construed so as to permit the Corporation to protect its directors, officers, employees and agents from personal liability in respect of their good faith service to or for the benefit of the Corporation to the fullest extent permitted by law.
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IN WITNESS WHEREOF, this Amended and Restated Certificate of Incorporation has been executed by a duly authorized officer of this Corporation on this 10th day of October, 2017.
RHYTHM PHARMACEUTICALS, INC.
| By: | /s/ Keith Gottesdiener |
| Name: | Kieth Gottesdiener |
| Title: | Chief Executive Officer |
CERTIFICATE OF AMENDMENT
TO
AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
OF
RHYTHM PHARMACEUTICALS, INC.
Pursuant to Section 242 of the
General Corporation Law of the State of Delaware
Rhythm Pharmaceuticals, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware,
does hereby certify that:
1. The Board of Directors of the Corporation duly adopted resolutions recommending and declaring advisable that the Amended and Restated Certificate of Incorporation of the Corporation be amended and that such amendment be submitted to the stockholders of the Corporation for their consideration, as follows:
RESOLVED, that the Amended and Restated Certificate of Incorporation of the Corporation be amended to add a new Article THIRTEEN, which shall read as follows:
“Except to the extent that the DGCL prohibits the elimination or limitation of liability of officers for breaches of fiduciary duty, no officer of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty as an officer. No amendment to or repeal of this provision shall apply to or have any effect on the liability or alleged liability of any officer of the Corporation for or with respect to any acts or omissions of such officer occurring prior to such amendment or repeal. If the DGCL is amended to permit further elimination or limitation of the personal liability of officers, then the liability of an officer of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL as so amended.”
2. The stockholders of the Corporation duly approved such amendment at an annual meeting of the stockholders of the Corporation.
3. Such amendment has been duly adopted in accordance with Section 242 of the General Corporation Law of the State of Delaware.
IN WITNESS WHEREOF, this Certificate of Amendment to Restated Certificate of Incorporation has been executed by a duly authorized officer of the Corporation on this 25th day of June, 2025.
| By: | /s/ David P. Meeker |
| Name: | David P. Meeker |
| Title: | President and Chief Executive Officer |
Document and Entity Information |
Jun. 24, 2025 |
|---|---|
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 24, 2025 |
| Entity File Number | 001-38223 |
| Entity Registrant Name | RHYTHM PHARMACEUTICALS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 46-2159271 |
| Entity Address State Or Province | MA |
| Entity Address, Address Line One | 222 Berkeley Street |
| Entity Address, Adress Line Two | 12th Floor |
| Entity Address, City or Town | Boston |
| Entity Address, Postal Zip Code | 02116 |
| City Area Code | 857 |
| Local Phone Number | 264-4280 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value per share |
| Trading Symbol | RYTM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001649904 |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | false |