Serina Therapeutics (SER) 10-Q 12 Nov 24 2024 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2024	Nov. 07, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	1-38519
Entity Registrant Name	Serina Therapeutics, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-1436829
Entity Address, Address Line One	601 Genome Way
Entity Address, Address Line Two	Suite 2001
Entity Address, City or Town	Huntsville
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35806
City Area Code	(256)
Local Phone Number	327-9630
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	SER
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		8,891,976
Entity Central Index Key	0001708599
Amendment Flag	false
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2024
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 3,185	$ 7,619
Grant receivable	14	0
Prepaid expenses and other current assets	2,224	0
Total current assets	5,423	7,619
Restricted cash	50	0
Property and equipment, net	519	573
Right of use assets - operating leases	509	666
Right of use assets - finance leases	92	110
Intangible assets, net	509	0
Other long-term prepaid assets	333	0
TOTAL ASSETS	7,435	8,968
Current liabilities:
Accounts payable	1,695	580
Accrued expenses	1,159	583
Loans due to Juvenescence, net of debt issuance costs	10,462	0
Other current liabilities	198	250
Total current liabilities	13,514	1,413
Warrant liability	6,744	0
Loans due to Juvenescence, net of current portion	693	0
Convertible promissory notes, at fair value	0	2,983
Operating lease liabilities, net of current portion	312	461
Finance lease liabilities, net of current portion	0	1
TOTAL LIABILITIES	21,263	4,858
Commitments and contingencies (Note 11)
Redeemable convertible preferred stock:
Redeemable convertible preferred stock, $0.01 par value; 10,000 authorized; none and 3,438 issued and outstanding at September 30, 2024 and December 31, 2023, respectively; Liquidation preference of none and $36,982 at September 30, 2024 and December 31, 2023, respectively	0	36,404
Stockholders’ deficit:
Preferred stock, $0.0001 par value, 5,000 shares authorized; none issued and outstanding at September 30, 2024 and December 31, 2023, respectively;	0	0
Common stock, $0.0001 par value, 40,000 shares authorized; and 8,892 and 2,410 shares issued and outstanding at September 30, 2024 and December 31, 2023, respectively;	1	25
Additional paid-in capital	8,000	858
Accumulated deficit	(21,775)	(33,177)
Total Serina Therapeutics, Inc. stockholders’ deficit	(13,774)	(32,294)
Noncontrolling interest	(54)	0
Total stockholders’ deficit	(13,828)	(32,294)
TOTAL LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK, AND STOCKHOLDERS’ DEFICIT	$ 7,435	$ 8,968

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Temporary equity, par or stated value per share (in usd per share)	$ 0.01	$ 0.01
Temporary equity, shares authorized (in shares)	10,000,000	10,000,000
Temporary equity, shares issued (in shares)	0	3,438,000
Temporary equity, shares outstanding (in shares)	0	3,438,000
Liquidation Preference	$ 0	$ 36,982
Preferred stock, par or stated value per share (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding( in shares )	0	0
Common stock, par or stated value per share (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares, issued (in shares)	8,892,000	2,410,000
Common stock, shares, outstanding (in shares)	8,892,000	2,410,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
REVENUES
Total revenues	$ 14	$ 29	$ 70	$ 66
OPERATING EXPENSES
Research and development	2,415	603	5,115	1,481
General and administrative	2,911	889	6,454	1,955
Total operating expenses	5,326	1,492	11,569	3,436
Loss from operations	(5,312)	(1,463)	(11,499)	(3,370)
OTHER INCOME (EXPENSE), NET
Interest expense	(16)	(100)	(509)	(382)
Fair value inception adjustment on convertible promissory note	0	0	0	2,240
Change in fair value of convertible promissory notes	0	2,614	(7,017)	4,477
Change in fair value of warrants	6,669	596	10,385	1,059
Other income, net	42	105	185	194
Total other income, net	6,695	3,215	3,044	7,588
NET INCOME (LOSS)	1,383	1,752	(8,455)	4,218
Net loss attributable to noncontrolling interest	27	0	54	0
NET INCOME (LOSS) ATTRIBUTABLE TO SERINA THERAPEUTICS, INC.	$ 1,410	$ 1,752	$ (8,401)	$ 4,218
NET EARNINGS (LOSS) PER COMMON SHARE:
BASIC (in usd per share)	$ 0.16	$ 0.80	$ (1.24)	$ 1.94
DILUTED (in usd per share)	$ 0.13	$ 0.23	$ (1.24)	$ 0.57
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
BASIC (in shares)	8,851	2,190	6,774	2,176
DILUTED (in shares)	10,751	7,584	6,774	7,548
Grant revenues
REVENUES
Total revenues	$ 14	$ 29	$ 70	$ 66

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2022	3,323,000
Beginning balance at Dec. 31, 2022	$ 35,442
Ending balance (in shares) at Mar. 31, 2023	3,323,000
Ending balance at Mar. 31, 2023	$ 35,442
Beginning balance at Dec. 31, 2022	(37,778)	$ 22	$ 646	$ (38,446)
Beginning balance (in shares) at Dec. 31, 2022		2,167,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2		2
Net income (loss)	1,658			1,658
Ending balance at Mar. 31, 2023	$ (36,118)	$ 22	648	(36,788)
Ending balance (in shares) at Mar. 31, 2023		2,167,000
Beginning balance (in shares) at Dec. 31, 2022	3,323,000
Beginning balance at Dec. 31, 2022	$ 35,442
Ending balance (in shares) at Sep. 30, 2023	3,438,000
Ending balance at Sep. 30, 2023	$ 36,404
Beginning balance at Dec. 31, 2022	(37,778)	$ 22	646	(38,446)
Beginning balance (in shares) at Dec. 31, 2022		2,167,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,218
Ending balance at Sep. 30, 2023	$ (33,346)	$ 24	858	(34,228)
Ending balance (in shares) at Sep. 30, 2023		2,410,000
Beginning balance (in shares) at Mar. 31, 2023	3,323,000
Beginning balance at Mar. 31, 2023	$ 35,442
Ending balance (in shares) at Jun. 30, 2023	3,323,000
Ending balance at Jun. 30, 2023	$ 35,442
Beginning balance at Mar. 31, 2023	(36,118)	$ 22	648	(36,788)
Beginning balance (in shares) at Mar. 31, 2023		2,167,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		15,000
Issuance of common stock upon exercise of stock options	1		1
Stock-based compensation	23		23
Net income (loss)	808			808
Ending balance at Jun. 30, 2023	$ (35,286)	$ 22	672	(35,980)
Ending balance (in shares) at Jun. 30, 2023		2,182,000
Redeemable Preferred Stock
Issuance of common stock upon conversion of preferred stock (in shares)	(115,000)
Issuance of common stock upon conversion of preferred stock	$ (962)
Ending balance (in shares) at Sep. 30, 2023	3,438,000
Ending balance at Sep. 30, 2023	$ 36,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		228,000
Issuance of common stock upon exercise of stock options	13	$ 2	11
Issuance of common stock upon conversion of AgeX-Serina Note	175		175
Net income (loss)	1,752			1,752
Ending balance at Sep. 30, 2023	$ (33,346)	$ 24	858	(34,228)
Ending balance (in shares) at Sep. 30, 2023		2,410,000
Beginning balance (in shares) at Dec. 31, 2023	3,438,000
Beginning balance at Dec. 31, 2023	$ 36,404
Redeemable Preferred Stock
Issuance of common stock upon conversion of preferred stock (in shares)	(3,438,000)
Issuance of common stock upon conversion of preferred stock	$ (36,404)
Ending balance (in shares) at Mar. 31, 2024	0
Ending balance at Mar. 31, 2024	$ 0
Beginning balance at Dec. 31, 2023	(32,294)	$ 25	858	(33,177)	$ 0
Beginning balance (in shares) at Dec. 31, 2023		2,410,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		64,000
Issuance of common stock upon exercise of stock options	4	$ 1	3
Issuance of common stock upon conversion of preferred stock (in shares)		3,438,000
Issuance of common stock upon conversion of preferred stock	36,404	$ 35	36,369
Issuance of common stock upon conversion of AgeX-Serina Note (in shares)		616,000
Issuance of common stock upon conversion of AgeX-Serina Note	10,721	$ 6	10,715
Cancellation of common stock upon consummation of Merger on March 26, 2024 (in shares)		(6,528,000)
Cancellation of common stock upon consummation of Merger on March 26, 2024	(10,721)	$ (67)	(47,833)	37,179
Merger and issuance of common stock to Legacy Serina shareholders upon consummation of Merger on March 26, 2024 (in shares)		8,414,000
Merger and issuance of common stock to Legacy Serina shareholders upon consummation of Merger on March 26, 2024	961	$ 1	960
Stock-based compensation	53		53
Net income (loss)	(15,015)			(15,015)
Ending balance at Mar. 31, 2024	$ (28,388)	$ 1	0	(28,389)	0
Ending balance (in shares) at Mar. 31, 2024		8,414,000
Beginning balance (in shares) at Dec. 31, 2023	3,438,000
Beginning balance at Dec. 31, 2023	$ 36,404
Ending balance (in shares) at Sep. 30, 2024	0
Ending balance at Sep. 30, 2024	$ 0
Beginning balance at Dec. 31, 2023	$ (32,294)	$ 25	858	(33,177)	0
Beginning balance (in shares) at Dec. 31, 2023		2,410,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	164,000
Merger and issuance of common stock to Legacy Serina shareholders upon consummation of Merger on March 26, 2024 (in shares)	5,913,277
Net income (loss)	$ (8,455)
Ending balance at Sep. 30, 2024	$ (13,828)	$ 1	8,000	(21,775)	(54)
Ending balance (in shares) at Sep. 30, 2024		8,892,000
Beginning balance (in shares) at Mar. 31, 2024	0
Beginning balance at Mar. 31, 2024	$ 0
Ending balance (in shares) at Jun. 30, 2024	0
Ending balance at Jun. 30, 2024	$ 0
Beginning balance at Mar. 31, 2024	(28,388)	$ 1	0	(28,389)	0
Beginning balance (in shares) at Mar. 31, 2024		8,414,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Deemed dividend from issuance of warrants	(18,501)		(1,125)	(17,376)
Issuance of common stock upon exercise of Post-Merger Warrants (in shares)		378,000
Issuance of common stock upon exercise of Post-Merger Warrants	6,360		6,360
Stock-based compensation	458		458
Transactions with noncontrolling interests	0		3		(3)
Net income (loss)	5,177			5,204	(27)
Ending balance at Jun. 30, 2024	$ (16,393)	$ 1	6,821	(23,185)	(30)
Ending balance (in shares) at Jun. 30, 2024		8,792,000
Ending balance (in shares) at Sep. 30, 2024	0
Ending balance at Sep. 30, 2024	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		100,000
Issuance of common stock upon exercise of stock options	86		86
Stock-based compensation	1,096		1,096
Transactions with noncontrolling interests	0		(3)		3
Net income (loss)	1,383			1,410	(27)
Ending balance at Sep. 30, 2024	$ (13,828)	$ 1	$ 8,000	$ (21,775)	$ (54)
Ending balance (in shares) at Sep. 30, 2024		8,892,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES:
Net income (loss)	$ (8,455)	$ 4,218
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	138	84
Non-cash lease expense	174	139
Non-cash interest expense on convertible promissory note	163	382
Amortization of debt issuance costs	337	0
Stock-based compensation	1,607	25
Fair value inception adjustment on convertible promissory note	0	(2,240)
Change in fair value of convertible promissory notes	7,017	(4,477)
Change in fair value of warrants	(10,385)	(1,059)
Changes in operating assets and liabilities:
Grant receivable	51	0
Prepaid expenses and other current assets	(2,449)	2
Accounts payable	(712)	523
Accrued expenses	132	(62)
Operating lease liabilities	(166)	(132)
Net cash used in operating activities	(12,548)	(2,597)
INVESTING ACTIVITIES:
Purchase of equipment	(17)	(434)
Net cash used in investing activities	(17)	(434)
FINANCING ACTIVITIES:
Drawdown on loan facilities from Juvenescence	2,933	0
Cash and restricted cash acquired in connection with the Merger	337	0
Proceeds from the exercise of stock options	90	15
Proceeds from the exercise of Post-Merger Warrants by Juvenescence	4,988	0
Proceeds from the issuance of convertible promissory notes	0	10,100
Principal repayment on loan facilities to Juvenescence	(133)	0
Principal repayments on finance lease liabilities	(34)	(35)
Net cash provided by financing activities	8,181	10,080
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(4,384)	7,049
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
At beginning of the period	7,619	532
At end of the period	3,235	7,581
SUPPLEMENTAL DISCLOSURES
Cash paid for interest	2	4
SUPPLEMENTAL SCHEDULE OF NON-CASH FINANCING AND INVESTING ACTIVITIES:
Right of use asset acquired in exchange for operating lease liabilities	0	672
Issuance of common stock upon conversion of Preferred Stock	36,404	0
Issuance of common stock upon conversion of AgeX-Serina Note	10,721	0
Merger and issuance of common stock upon consummation of Merger on March 26, 2024	961	0
Deemed dividend from issuance of warrants	$ 1,125	$ 0

Organization, Business Overview

Organization, Business Overview and Liquidity	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Business Overview and Liquidity	Organization, Business Overview and Liquidity Serina Therapeutics, Inc. (“Serina” or the “Company”) was incorporated as AgeX Therapeutics, Inc. in January 2017 in the state of Delaware. On March 26, 2024, AgeX Therapeutics, Inc. (“AgeX”) completed a merger transaction in accordance with the terms and conditions of the Agreement and Plan of Merger and Reorganization, dated as of August 29, 2023 (the “Merger Agreement”), by and among AgeX, Canaria Transaction Corporation, an Alabama corporation and a wholly owned subsidiary of AgeX (“Merger Sub”), and Serina Therapeutics, Inc., an Alabama corporation (“Legacy Serina”), pursuant to which Merger Sub merged with and into Legacy Serina, with Legacy Serina surviving the merger as a wholly owned subsidiary of AgeX (the “Merger”). Additionally, on March 26, 2024, AgeX changed its name from “AgeX Therapeutics, Inc.” to “Serina Therapeutics, Inc.” (the “Company”). At the effective time of the Merger, each outstanding share of Legacy Serina capital stock (after giving effect to the automatic conversion of all shares of Legacy Serina preferred stock into shares of Legacy Serina common stock and excluding any shares held as treasury stock by Legacy Serina or held or owned by AgeX or any subsidiary of AgeX or of Legacy Serina and any dissenting shares) was converted into the right to receive 0.97682654 shares of AgeX common stock, which resulted in AgeX issuing an aggregate of 5,913,277 shares of AgeX common stock to the stockholders of Legacy Serina. In addition, AgeX assumed the Legacy Serina 2017 Stock Option Plan, and each outstanding and unexercised option to purchase Legacy Serina common stock and each outstanding and unexercised warrant to purchase Legacy Serina capital stock was adjusted with such stock options and warrants henceforth representing the right to purchase a number of shares of Company common stock equal to 0.97682654 multiplied by the number of shares of Legacy Serina common stock previously represented by such options and warrants. Following the consummation of the Merger, the business previously conducted by Legacy Serina became the business conducted by the Company, which is now a clinical-stage biotechnology company developing Legacy Serina’s drug product candidates. The Company’s headquarters are located in Huntsville, Alabama (Legacy Serina’s headquarters). The Company is a clinical-stage biotechnology company developing a pipeline of wholly-owned drug product candidates to treat neurological diseases and pain. The Company’s POZ drug delivery technology is designed to enable certain existing drugs and novel drug candidates to be modified in a way that may provide an increase in efficacy and safety of the resulting polymeric drug conjugate. The Company’s proprietary POZ technology is based on a synthetic, water soluble, low viscosity polymer called poly(2-oxazoline). The Company’s POZ technology is engineered to provide greater control in drug loading and more precision in the rate of release of attached drugs delivered via subcutaneous injection. The therapeutic agents in the Company’s product candidates are typically well-understood and marketed drugs that are effective but are limited by pharmacokinetic (PK) profiles that can include toxicity, side effects and short half-life. The Company believes that by using POZ technology, drugs with narrow therapeutic windows can be designed to maintain more desirable and stable levels in the blood. The Company believes that POZ technology can be applied to small molecules, proteins, antibody drug conjugates, and other classes of molecules. Prior to the closing of the Merger, any assets of AgeX other than certain “Legacy Assets” were transferred into a recently formed subsidiary of AgeX, UniverXome Bioengineering, Inc. (“UniverXome”). UniverXome assumed (i) any outstanding indebtedness of AgeX to Juvenescence Limited (“Juvenescence”), which was secured by the assets contributed to UniverXome, (ii) most of the Company’s contracts with third parties, other than certain designated contracts and any contracts that were terminated before the Merger, and (iii) all other liabilities of the Company in existence as of the effective time of the Merger (other than certain transaction expenses related to the Merger). Liquidity and Going Concern In addition to general economic and capital market trends and conditions, the Company’s ability to raise sufficient additional capital to finance its operations from time to time will depend on a number of factors specific to the Company’s operations such as operating expenses and progress in out-licensing its technologies and development of its product candidates. The unavailability or inadequacy of financing to meet future capital needs could force the Company to modify, curtail, delay, or suspend some or all aspects of planned operations. Sales of additional equity securities could result in the dilution of the interests of its stockholders. The Company cannot assure that adequate financing will be available on favorable terms, if at all. The Company recognized net loss of $8.5 million for the nine months ended September 30, 2024. The Company used $12.5 million in net cash from operating activities for the period ended September 30, 2024 and has historically incurred losses from operations and expects to continue to generate negative cash flows as the Company implements its business plan. Management believes that its cash and cash equivalents of $3.2 million as of September 30, 2024, along with the $10 million of cash proceeds expected to be received from Juvenescence through the exercise of Juvenescence’s remaining Post-Merger Warrants as provided in a “Side Letter”, will be used to fund Company operations but are not expected to be sufficient to satisfy the Company’s anticipated operating and other funding requirements for the twelve months from the issuance of these condensed consolidated interim financial statements. See Note 7, Stockholders’ Equity/(Deficit) regarding the Post-Merger Warrants and Side Letter. Management has based its estimate of the funds needed to finance Company operations on assumptions that may prove to be wrong, and available capital resources could be exhausted sooner than expected. As such, there is substantial doubt about the Company’s ability to continue as a going concern. The Company is subject to risks and uncertainties common to early-stage companies in the biotechnology industry, including, but not limited to, technical risks associated with the successful research, development and manufacturing of therapeutic candidates, development by competitors of new technological innovations, dependence on key personnel, protection of proprietary technology, compliance with government regulations, and the ability to secure additional capital to fund operations. Therapeutic drug candidates currently under development will require significant additional research and development efforts, including extensive preclinical and clinical testing and regulatory approval prior to commercialization. These efforts will require significant amounts of additional capital, adequate personnel, and infrastructure. Even if the Company’s product development efforts are successful, it is uncertain when, if ever, the Company will realize revenue from product sales. The Company expects to largely rely on raising capital from equity investors for funding its operations. Some funding is expected to be obtained through licensing agreements or other arrangements with commercial entities.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies The unaudited condensed consolidated interim financial statements presented herein, and as discussed below, have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the requirements of the Securities and Exchange Commission (“SEC”) for interim reporting. In accordance with those rules and regulations, certain information and footnote disclosures normally included in comprehensive consolidated financial statements have been condensed or omitted. The condensed consolidated balance sheet as of September 30, 2024 and the condensed consolidated statements of operations, condensed consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit) for the three and nine months ended September 30, 2024, and 2023 and condensed consolidated statements of cash flows for the nine months ended September 30, 2024, and 2023 are unaudited. The condensed consolidated balance sheet as of December 31, 2023 was derived from the audited consolidated financial statements at that date but does not include all the information and footnotes required by U.S. GAAP. These condensed consolidated interim financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the years ended December 31, 2023 and 2022 attached as Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on April 1, 2024 . The accompanying condensed consolidated interim financial statements, in the opinion of management, include all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the Company’s financial condition and results of operations. The condensed consolidated results of operations are not necessarily indicative of the results to be expected for any other interim period or for the entire year. Principles of consolidation The consolidated financial statements include the accounts of the Company and its subsidiaries in which the Company has a controlling financial interest. For consolidated entities where the Company has less than 100% of ownership, the Company records net loss attributable to noncontrolling interest on the consolidated statement of operations equal to the percentage of the ownership interest retained in such entities by the respective noncontrolling parties. The noncontrolling interest is reflected as a separate element of stockholders’ equity (deficit) on the Company’s consolidated balance sheets. Any material intercompany transactions and balances have been eliminated upon consolidation. The Company assesses whether it is the primary beneficiary of a variable interest entity (“VIE”) at the inception of the arrangement and at each reporting date. This assessment is based on its power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the Company’s obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. If the entity is within the scope of the variable interest model and meets the definition of a VIE, the Company considers whether it must consolidate the VIE or provide additional disclosures regarding its involvement with the VIE. If the Company determines that it is the primary beneficiary of the VIE, the Company will consolidate the VIE. This analysis is performed at the initial investment in the entity or upon any reconsideration event. For entities the Company holds as an equity investment that are not consolidated under the VIE model, the Company will consider whether its investment constitutes a controlling financial interest in the entity and therefore should be considered for consolidation under the voting interest model. The Company has five subsidiaries: Legacy Serina and UniverXome, which are wholly-owned subsidiaries, and ReCyte Therapeutics, Inc. (“ReCyte”), Reverse Bioengineering, Inc. (“Reverse Bio”), and NeuroAirmid Therapeutics, Inc. (“NeuroAirmid”). Following the Merger, the Company is primarily focused on developing Legacy Serina’s product candidates which are described elsewhere in this Report. Prior to the Merger, on March 26, 2024, pursuant to the Merger Agreement, the Company contributed all of its stock in Reverse Bio and ReCyte, along with substantially all of the assets (other than the stock of NeuroAirmid) of the Company to UniverXome. In exchange for the contribution of those assets, UniverXome assumed certain liabilities, including all of the Company’s indebtedness to Juvenescence. UniverXome owns 94.8% of the outstanding capital stock of ReCyte. ReCyte owns certain pre-clinical research and development assets involving stem cell-derived endothelial and cardiovascular related progenitor cells for the treatment of vascular disorders and ischemic conditions. The Company owns 100% of the outstanding capital of Reverse Bio through UniverXome. Reverse Bio owns assets involved in partial cellular reprogramming using its iTR™ technology with the intent to revert aged or diseased cells to a healthy and functional state. NeuroAirmid is jointly owned by the Company and certain researchers from the University of California and was organized to pursue certain cell therapies, focusing initially on Huntington’s Disease. The Company owns 47.5% of the outstanding capital stock of NeuroAirmid. The Company consolidates NeuroAirmid despite not having majority ownership interest as it has the ability to influence decision making and financial results through contractual rights and obligations as per Accounting Standards Codification (“ASC”) 810, Consolidation . On March 27, 2024, the Board of Directors of the Company formed a special committee for the purpose of exploring strategic alternatives for the business, assets and/or stock of UniverXome, Reverse Bio, ReCyte and NeuroAirmid. Financial Statement Reclassification Certain account balances from prior periods have been reclassified in these condensed consolidated financial statements to conform to current period classifications. Accounts payable and accrued expenses, previously presented as one line item on the condensed consolidated balance sheet, are now presented separately given the materiality of the balances. The current portion of operating and finance lease liabilities were also reclassified to other current liabilities. Additionally, the Non-cash interest expense on convertible promissory note, previously combined with accrued expenses in the operating activities section of the condensed consolidated statement of cash flows, is now presented separately within operating activities. These reclassifications had no effect on the reported results of operations or financial position. Use of estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect (i) the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and (ii) the reported amounts of revenues and expenses during the reporting period, in each case with consideration given to materiality. Significant estimates and assumptions which are subject to significant judgment include those related to going concern assessment of consolidated financial statements, useful lives associated with long-lived assets, including evaluation of asset impairment, allowances for uncollectible accounts receivables, loss contingencies, deferred income taxes and tax reserves, including valuation allowances related to deferred income taxes, determining the fair value of the Company’s embedded derivatives in the convertible notes payable and receivable, and assumptions used to value stock-based awards or other equity instruments and liability classified warrants. Actual results could differ materially from those estimates. To the extent there are material differences between the estimates and actual results, the Company’s future results of operations will be affected. Concentration of credit risk and other risks and uncertainties Financial instruments that potentially subject the Company to concentrations of risk consist principally of cash equivalents. The Company maintains its cash deposits in Federal Deposit Insurance Corporation (“FDIC”) insured financial institutions and may at times hold investments at Securities Investor Protection Corporation (“SIPC”) insured broker-dealers. At times, the balances in these accounts may be in excess of FDIC and SIPC insured limits. At September 30, 2024 and December 31, 2023, cash and cash equivalents deposits in excess of FDIC limits were $0.9 million and zero, respectively, and investments and deposits in excess of SIPC limits were $1.3 million and $7.3 million, respectively. Product candidates developed by the Company and its subsidiaries will require approvals or clearances from the United States Food and Drug Administration (“FDA”) or foreign regulatory agencies prior to commercial sales. There can be no assurance that any of the product candidates being developed or planned to be developed by the Company or its subsidiaries will receive any of the required approvals or clearances. If regulatory approval or clearance were to be denied or any such approval or clearance was to be delayed, it would have a material adverse impact on the Company. Fair value measurements of financial instruments The Company has adopted ASC Topic 820, Fair Value Measurement , for certain financial instruments measured as fair value on a recurring basis. ASC Topic 820 defines fair value, establishes a framework for measuring fair value in accordance with accounting principles generally accepted in the United States, and expands disclosures about fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of inputs that may be used to measure fair value are as follows: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities. Level 2 inputs also include non-binding market consensus prices that can be corroborated with observable market data, as well as quoted prices that were adjusted for security-specific restrictions. • Level 3: Unobservable inputs to the valuation methodology are significant to the measurement of the fair value of assets or liabilities. Level 3 inputs also include non-binding market consensus prices or non-binding broker quotes that we were unable to corroborate with observable market data. Accounting for warrants The Company determines the accounting classification of warrants it issues, as either liability or equity, by first assessing whether the warrants meet liability classification in accordance with ASC 480-10, Accounting for Certain Financial Instruments with Characteristics of both Liabilities and Equity , then in accordance with ASC 815-40, Accounting for Derivative Financial Instruments Indexed to, and Potentially Settled in, a Company’s Own Stock . Under ASC 480, warrants are considered liability classified if the warrants are mandatorily redeemable, obligate the Company to settle the warrants or the underlying shares by paying cash or other assets, or warrants that must or may require settlement by issuing a variable number of shares. If warrants do not meet liability classification under ASC 480-10, the Company assesses the requirements under ASC 815-40, which states that contracts that require or may require the issuer to settle the contract for cash are liabilities recorded at fair value, irrespective of the likelihood of the transaction occurring that triggers the net cash settlement feature. If the warrants do not require liability classification under ASC 815-40, and in order to conclude equity classification, the Company also assesses whether the warrants are indexed to its common stock and whether the warrants are classified as equity under ASC 815-40 or other applicable U.S. GAAP. After all relevant assessments, the Company concludes whether the warrants are classified as liability or equity. Liability classified warrants require fair value accounting at issuance and subsequent to initial issuance with all changes in fair value after the issuance date recorded in the consolidated statements of operations. Equity classified warrants only require fair value accounting at issuance with no changes recognized subsequent to the issuance date. See Notes 5, Related Party Transactions and 6, Fair Value Measurements , for additional information regarding warrants. Redeemable convertible preferred stock The Company recorded redeemable convertible preferred stock at fair value upon issuance, net of any issuance costs. As of December 31, 2023, the Company's preferred stock that was redeemable in circumstances not within the Company’s control was classified outside of permanent equity. The redeemable preferred stock was converted into common stock on March 26, 2024 upon consummation of the Merger. Cash, cash equivalents, and restricted cash A reconciliation of the Company’s cash and cash equivalents in the condensed consolidated balance sheets to cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows for all periods presented is as follows (in thousands): September 30, 2024 December 31, 2023 Cash and cash equivalents $ 3,185 $ 7,619 Restricted cash (1) 50 — Cash, cash equivalents, and restricted cash as shown in the condensed consolidated statements of cash flows $ 3,235 $ 7,619 (1) Restricted cash entirely represents the deposit required to maintain the Company’s corporate credit card program. Property and equipment, net Property and equipment are carried at cost less accumulated depreciation. The costs of additions and betterments are capitalized and expenditures for repairs and maintenance are expensed as incurred. When items of property and equipment are sold or retired, the related costs and accumulated depreciation are removed from the accounts and any gain or loss is included in the consolidated statements of operations. Depreciation of property and equipment is provided utilizing the straight-line method over the range of lives used of the respective assets, which is 3 - 10 years. Leases The Company determines if an arrangement is a lease at inception. Leases are classified as either financing or operating, with classification affecting the pattern of expense recognition in the consolidated statements of operations. The Company recognizes right-of-use (“ROU”) assets and lease liabilities for leases with terms greater than twelve months in the consolidated balance sheet. ROU assets represent an entity’s right to use an underlying asset during the lease term and lease liabilities represent an entity’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. If the lease agreement does not provide an implicit rate in the contract, the lessee uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. For such purposes, the lease term applied may include options to extend or terminate the lease when it is reasonably certain that the Company or a subsidiary will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has elected to combine lease and non-lease components as a single component. Operating leases are recognized on the consolidated balance sheet as ROU lease assets, current lease liabilities, and non-current lease liabilities. Fixed rents are included in the calculation of the lease balances, while variable costs paid for certain operating and pass through costs are excluded. Lease expense is recognized over the expected term on a straight-line basis. Intangible assets, net Intangible assets, consisting primarily of acquired in-process research and development (“IPR&D”) with alternative future use and patents, are stated at acquired cost, less accumulated amortization. Amortization expense is computed using the straight-line method over the estimated useful life of 10 years. See Note 3, Selected Balance Sheet Components . Impairment of long-lived assets The Company assesses the impairment of long-lived assets whenever events or changes in circumstances indicate that such assets might be impaired and the carrying value may not be recoverable. If events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the expected undiscounted future cash flows attributable to the asset are less than the carrying amount of the asset, an impairment loss, equal to the excess of the carrying value of the asset over its fair value, is recorded. There has been no impairment of long-lived assets for the accounting periods presented. Grant revenues The Company receives government grants that reimburse the Company for certain allowable costs for funded projects. Grant revenue is recognized in the condensed consolidated statement of operations on a systematic basis over the period in which the Company recognizes qualified research and development costs that grant is intended to compensate and there is reasonable assurance that the Company will meet the terms and conditions of the grant. The Company accounts for grants received to perform research and development services in accordance with ASC 730-20, Research and Development Arrangements. At the inception of the grant, we perform an assessment as to whether the grant is a liability or a contract to perform research and development services for others. If the Company or a subsidiary receiving the grant is obligated to repay the grant funds to the grantor regardless of the outcome of the research and development activities, then the Company is required to estimate and recognize that liability. Alternatively, if the Company or a subsidiary receiving the grant is not required to repay, or if it is required to repay the grant funds only if the research and development activities are successful, then the grant agreement is accounted for as a contract to perform research and development services for others, in which case, grant revenue is recognized when the related research and development expenses are incurred. In applying the provisions of Topic 606, the Company has determined that government grants are out of the scope of Topic 606 because the government entities do not meet the definition of a “customer”, as defined by Topic 606, as there is not considered to be a transfer of control of good or services to the government entities funding the grant. In the absence of applicable guidance under U.S. GAAP, our policy is to recognize grant revenue when the related costs are incurred, provided that the applicable conditions under the government contracts have been met. Only costs that are allowable under the grant award, certain government regulations and the National Institutes of Health’s supplemental policy and procedure manual may be claimed for reimbursement, and the reimbursements are subject to routine audits from governmental agencies from time to time. Costs incurred are recorded in research and development expenses on the accompanying condensed consolidated statements of operations. The Company believes the recognition of revenue as costs are incurred and amounts become realizable is analogous to the concept of transfer of control of a service over time under ASC 606. Grant revenues for the three and nine months ended September 30, 2024 and 2023 were not material. Research and development Research and development costs are expensed as they are incurred and include compensation for scientists, support personnel, outside contracted services, and material costs associated with product development. The Company continually evaluates new product opportunities and engages in intensive research and product development efforts. Research and development expenses include both direct costs tied to a specific contract or grant, and indirect costs. Research and development expenses incurred and reimbursed by grants from third parties or governmental agencies, if any and as applicable, approximate the respective revenues recognized in the condensed consolidated statements of operations. General and administrative General and administrative expenses consist primarily of compensation and related benefits, including stock-based compensation, for executive and corporate personnel, and professional and consulting fees. Income taxes Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently due plus deferred taxes related primarily to differences between the basis of loss carryovers and depreciation differences for financial and income tax reporting. Deferred taxes represent the future tax return consequences of those differences, which will either be taxable or deductible when the assets and liabilities are recovered or settled. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which the differences are expected to be recovered or settled. The Company only recognizes tax benefits from an uncertain tax position if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate resolution. To date, the Company has not recognized such tax benefits in its financial statements. Stock-based Compensation Expense The Company recognizes compensation expense related to employee option grants and restricted stock grants, if any, in accordance with ASC 718, Compensation – Stock Compensation (“ASC 718”). Forfeitures are accounted for as they occur. The Company uses the Black-Scholes option pricing model for estimating the fair value of options granted under its equity award plans, including the 2024 Inducement Plan, 2024 Incentive Plan, 2017 Option Plan, and 2017 Incentive Plan. The fair value of each restricted stock grant, if any, is determined based on the value of the common stock granted or sold. The Company has elected to treat stock-based payment awards with time-based service conditions as a single award and recognizes stock-based compensation on a straight-line basis over the requisite service period. Compensation expense for non-employee stock-based awards is recognized in accordance with ASC 718. Stock option awards issued to non-employees, principally consultants or outside contractors, as applicable, are accounted for at fair value using the Black-Scholes option pricing model. Management believes that the fair value of the stock options and restricted stock units can more reliably be measured than the fair value of services received. The Company records compensation expense based on the then-current fair values of the stock options and restricted stock units at the grant date. Compensation expense for non-employee grants is recorded on a straight-line basis in the condensed consolidated statements of operations. Basic and diluted net earnings (loss) per share attributable to common stockholders Basic earnings (loss) per share (“EPS”) of common stock is computed by dividing net income (loss) available to common stockholders (numerator) by the weighted average number of shares of common stock outstanding (denominator) during the period. Diluted EPS gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method for stock options and warrants and the if-converted method for redeemable convertible preferred stock and convertible promissory notes. In computing diluted EPS, the average stock price for the period is used to determine the number of shares assumed to be purchased from the exercise of stock options and/or warrants. Diluted EPS excluded all dilutive potential shares if their effect is anti-dilutive. Segment reporting Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker, the Chief Executive Officer, in making decisions regarding resource allocation and assessing performance. The Company views its operations and manages its business as one operating segment in the United States of America. Recently adopted accounting pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. The expanded annual disclosures are effective for our year ending December 31, 2024, and the expanded interim disclosures are effective in 2025 and will be applied retrospectively to all prior periods presented. Early adoption is permitted. The Company is currently assessing the impact of the guidance on its consolidated financial statements and disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to income Tax Disclosures , under which entities must consistently categorize and provide greater disaggregation of information in the rate reconciliation. They must also further disaggregate income taxes paid. ASU 2023-09 enhances annual income tax disclosures to address investor requests for more information about the tax risks and opportunities present in an entity’s worldwide operations. The Company adopted this standard as of January 1, 2024, and it did not have a material impact on the condensed consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted In March 2024, the FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements

Selected Balance Sheet Componen

Selected Balance Sheet Components	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Selected Balance Sheet Components	Selected Balance Sheet Components Prepaid expenses and other current assets Prepaid expenses and other current assets was as follows (in thousands): September 30, 2024 December 31, 2023 Prepaid technology access fee $ 1,334 $ — Prepaid insurance 375 — Other prepaid expenses 372 — Other current assets 143 — Total prepaid expenses and other current assets $ 2,224 $ — Property and equipment, net Property and equipment at September 30, 2024 and December 31, 2023 net of accumulated depreciation expense was as follows (in thousands): September 30, 2024 December 31, 2023 Computer equipment $ 31 $ 30 Equipment 853 837 Software 96 96 Total property and equipment 980 963 Less accumulated depreciation (461) (390) Total property and equipment, net $ 519 $ 573 Depreciation expense for the three and nine months ended September 30, 2024 and 2023 was immaterial. Intangible assets, net At September 30, 2024, intangible assets, primarily consisting of acquired IPR&D with alternative use and patents, and accumulated amortization were as follows (in thousands): September 30, 2024 Intangible assets $ 576 Accumulated amortization (67) Total intangible assets, net $ 509 The Company recognized immaterial amortization expense of intangible assets, included in research and development expenses, for the three and nine months ended September 30, 2024. The Company did not have intangible assets prior to the Merger which consummated on March 26, 2024. Amortization of intangible assets for periods subsequent to September 30, 2024 is as follows (in thousands): Year Ending December 31, Amortization 2024 $ 33 2025 131 2026 131 2027 131 Thereafter 83 Total $ 509 Accrued liabilities At September 30, 2024 and December 31, 2023, accrued liabilities were comprised of the following (in thousands): September 30, 2024 December 31, 2023 Accrued severance $ 606 $ — Accrued interest on convertible promissory notes — 558 Accrued compensation 201 13 Other accrued expenses 352 12 Total accrued expenses $ 1,159 $ 583

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Convertible Notes Agreement and Asset Contribution Agreement On March 26, 2024, AgeX entered into an Asset Contribution Agreement with UniverXome (the “Asset Contribution Agreement”) pursuant to which AgeX transferred to UniverXome all of AgeX’s capital stock in Reverse Bio and ReCyte, along with certain patents, patent applications, and other intellectual property, certain biological materials, certain trademarks and service marks, certain equipment, certain inventory, and certain files and records relating to the foregoing, and UniverXome assumed all of the Liabilities (as defined in the Asset Contribution Agreement) in existence as the Effective Time (as defined in the Merger Agreement) other than the Transaction Expenses (as defined in the Merger Agreement) and certain other liabilities. Concurrently with the execution of the Asset Contribution Agreement, AgeX, and its subsidiaries UniverXome, Reverse Bio, and ReCyte (the “Subsidiary Obligors”), entered into an Agreement with Respect to the Convertible Notes (the “Convertible Notes Agreement”) with Juvenescence. Pursuant to the Convertible Notes Agreement, AgeX transferred to UniverXome, and UniverXome assumed, all of AgeX’s rights and obligations under the 2022 Secured Note and 2023 Secured Note and related Security Agreements described below. Juvenescence agreed to release AgeX from its obligations under (i) the 2022 Secured Note and the 2023 Secured Note (collectively, the “Convertible Notes”), together with (ii) all agreements evidencing or securing the Convertible Notes, including the related Security Agreements, and UniverXome assumed all of AgeX’s obligations under the Convertible Notes and related agreements, including the Security Agreements. As a result, (i) Juvenescence agreed to look solely to UniverXome, and ReCyte and Reverse Bio as guarantors, for any and all obligations, including repayment, under the Convertible Notes, the Security Agreements, and related documents, and (ii) Juvenescence released its security interests in the assets of AgeX and certain subsidiaries, including its security interests in the stock of UniverXome, the stock and assets of Merger Sub, the stock and assets of NeuroAirmid, and certain cGMP embryonic cell lines used to support the NeuroAirmid business, and any security interest that it might have in the stock and assets of Merger Sub and Legacy Serina, while retaining its security interest in the stock and assets of ReCyte and Reverse Bio and in AgeX assets transferred to UniverXome. Juvenescence also agreed to provide the Company with a claims reserve for the purpose of settling and paying the costs associated with certain claims and demands against the Company, which claims reserve will be an additional debt obligation of UniverXome. The Convertible Notes Agreement amended certain provisions of the 2022 Secured Note and 2023 Secured Note to eliminate (i) the provisions permitting Juvenescence and AgeX to convert outstanding amounts owed into shares of AgeX common stock, and (ii) certain related provisions. The Convertible Notes Agreement includes a mechanism for adjusting the amount outstanding under the 2022 Secured Note as necessary for AgeX to have had $0.5 million of immediately spendable non-restricted cash net of all payables and other liabilities as of the closing of the Merger to meet the closing condition under the Merger Agreement. Indebtedness Exchange Agreement and Issuance of AgeX Preferred Stock During July 2023, AgeX and Juvenescence entered into an Exchange Agreement pursuant to which AgeX issued shares of Series A Preferred Stock and Series B Preferred Stock to Juvenescence in exchange for the extinguishment of a total of $36.0 million of indebtedness under a Secured Convertible Facility Agreement (the “2020 Loan Agreement”), the 2022 Secured Note, and the 2023 Secured Note discussed below. The Series A Preferred Stock and Series B Preferred Stock automatically converted into shares of AgeX common stock on February 1, 2024. 2022 Secured Note The following summary of the 2022 Secured Note is qualified by the terms of the Convertible Notes Agreement which substitutes UniverXome for AgeX as the “borrower” and primary obligor pursuant to the 2022 Secured Note and the Security Agreement described below, and which amends certain provisions of the 2022 Secured Note. On February 14, 2022, AgeX and Juvenescence entered into a Secured Convertible Promissory Note (the “2022 Secured Note”) pursuant to which Juvenescence agreed to provide to AgeX a $13.2 million line of credit for a period of 12 months. The Company drew an initial $8.2 million of the line of credit and used $7.2 million to refinance the outstanding principal and the loan origination fees under a prior loan agreement with Juvenescence. On February 9, 2023, AgeX and Juvenescence entered into an Amended and Restated Secured Convertible Promissory Note which amends and restates the 2022 Secured Note and added $2.0 million to the line of credit available to be borrowed by AgeX, under the 2022 Secured Note subject to Juvenescence’s discretion to approve each loan draw. On May 9, 2023, AgeX and Juvenescence entered into an Allonge and Second Amendment to Amended and Restated Convertible Promissory Note (the “Second Amendment”) that increased the amount of the line of credit available to AgeX by $4.0 million, subject to the terms of the 2022 Secured Note and Juvenescence’s discretion to approve and fund each of AgeX’s future draws of that additional amount of credit. On June 2, 2023, AgeX and Juvenescence entered into a Third Amendment to Amended and Restated Convertible Promissory Note (the “Third Amendment’), which provided that (i) AgeX could draw on the available portion of the line of credit under the 2022 Secured Note until the earlier of the date a Qualified Offering as defined in the 2022 Secured Note is consummated by AgeX or October 31, 2023 (subject to Juvenescence’s discretion to approve each loan draw as provided in the 2022 Secured Note), (ii) AgeX would not be obligated to issue additional common stock purchase warrants to Juvenescence in connection with the receipt of loan funds made available pursuant to the Second Amendment, and (iii) the definition of “Reverse Financing Condition” was amended to extend to June 20, 2023 the referenced deadline for fulfillment of the condition to permit borrowing or other incurrence of indebtedness by Reverse Bio. On July 31, 2023, AgeX and Juvenescence entered into a Fourth Amendment (the “Fourth Amendment”) to the 2022 Secured Note, which provided that (i) the definition of Reverse Financing Condition was amended to extend to October 31, 2023 the referenced deadline for fulfillment of the condition to permit borrowing or other incurrence of indebtedness by Reverse Bio, and (ii) certain aspects of the loan conversion provisions of the 2022 Secured Note were amended. On November 9, 2023, AgeX and Juvenescence entered into the Allonge and Fifth Amendment to Amended and Restated Convertible Promissory Note (the “Fifth Amendment”) that increased the amount of the line of credit available to AgeX by $4.4 million, subject to the terms of the 2022 Secured Note and Juvenescence’s discretion to approve and fund each of AgeX’s future draws of that additional amount of credit. Concurrently with the execution of the Fifth Amendment, AgeX also entered into an additional Pledge Agreement to add shares of a subsidiary to the collateral under the Security Agreement, and AgeX’s subsidiaries ReCyte, Reverse Bio, and UniverXome each entered into a Guaranty Agreement and Joinder Agreement pursuant to which each of them agreed to guaranty AgeX’s obligations to Juvenescence pursuant to the 2022 Secured Note, as amended by the Fifth Amendment, and to grant Juvenescence a security interest in their respective assets pursuant to the Security Agreement to secure their obligations to Juvenescence. On February 9, 2024, AgeX and Juvenescence executed a Sixth Amendment to Amended and Restated Convertible Promissory Note (the “Sixth Amendment”) that extended to May 9, 2024 the “Repayment Date” on which the outstanding principal balance and accrued loan origination fees will become due and payable pursuant to the 2022 Secured Note. On March 26, 2024, AgeX entered into an Allonge and Seventh Amendment to the Amended and Restated Convertible Promissory Note (the “Seventh Amendment”) that provided the Company an additional $2.4 million of credit subject to the terms of the 2022 Secured Note which was drawn entirely on March 29, 2024. On May 8, 2024, the Company entered into an Allonge and Eighth Amendment to the Amended and Restated Convertible Promissory Note that extended to December 31, 2024 the “Repayment Date” on which the outstanding principal balance and accrued loan origination fees will become due and payable pursuant to the 2022 Secured Note and provided the Company an additional $0.5 million of credit subject to the terms of the 2022 Secured Note which was drawn entirely on May 9, 2024. The funds were used to pay certain litigation settlement expenses and related litigation costs. From January 1 through September 30, 2024, AgeX drew in the aggregate $6.3 million of its credit available under the 2022 Secured Note with Juvenescence. As of September 30, 2024, AgeX had borrowed a total of $26.5 million under the 2022 Secured Note, of which $7.5 million was borrowed during the year ended December 31, 2023. During July 2023, $18.0 million of 2022 Secured Note indebtedness, comprised of $16.7 million borrowing and $1.3 million of accrued loan origination fees, was extinguished in exchange for shares of AgeX Series A Preferred Stock and Series B Preferred Stock pursuant to the Exchange Agreement between AgeX and Juvenescence. As an arrangement fee for the 2022 Secured Note, AgeX agreed to pay Juvenescence an origination fee in an amount equal to 4% of the amount of each draw of loan funds, which will accrue as each draw is funded, and an additional 4% of all the total amount of funds drawn that will accrue following the end of the period during which funds may be drawn from the line of credit. The origination fee will become due and payable on the repayment date or in a pro rata amount with any prepayment of in whole or in part of the outstanding principal balance of the 2022 Secured Note. 2022 Warrants – Upon each drawdown of funds under the 2022 Secured Note prior to June 2, 2023 when the Third Amendment went into effect, AgeX issued to Juvenescence warrants to purchase shares of AgeX common stock (“2022 Warrants”). The 2022 Warrants are governed by the terms of a Warrant Agreement between AgeX and Juvenescence. The number of 2022 Warrants issued with respect to each draw of loan funds was equal to 50% of the number determined by dividing the amount of the applicable loan draw by the applicable Market Price. The Market Price was the last closing price per share of AgeX common stock on the NYSE American preceding the delivery of the notice from AgeX requesting the draw of funds that triggered the obligation to issue 2022 Warrants. As of December 31, 2023, AgeX had issued to Juvenescence 2022 Warrants to purchase a total of 294,482 shares of AgeX common stock, of which 2022 Warrants to purchase 53,980 shares of AgeX common stock were issued during the year ended December 31, 2023. The exercise prices of the 2022 Warrants issued through December 31, 2023 ranged from $20.75 per share to $30.94 per share representing the market closing price of AgeX common stock on the NYSE American on the one day prior to delivery of the drawdown notices. However, 2022 Warrants to purchase a total of 164,889 shares of AgeX common stock were cancelled pursuant to the Merger Agreement and the remaining 2022 Warrants to purchase a total of 129,593 shares of common stock at prices ranging from $20.75 to $25.01 remain in effect. The number of shares issuable upon exercise of the 2022 Warrants and the exercise price per share are subject to adjustment upon the occurrence of certain events such as a stock split or reverse split or combination of the common stock, stock dividend, recapitalization or reclassification of the common stock, and similar events, and have been adjusted to give effect to the a 1 for 35.17 reverse stock split that AgeX implemented on March 14, 2024. See Note 7, Stockholders’ Equity/(Deficit) . The 2022 Warrants will expire at 5:00 p.m. New York time three years after the date of issue. The expiration dates range from June 5, 2025 to April 3, 2026. Conversion of Loan Amounts to Common Stock – The 2022 Secured Note included provisions allowing AgeX or Juvenescence to convert the loan balance and any accrued but unpaid origination fee into AgeX common stock; however, those provisions were eliminated from the 2022 Note pursuant to the Convertible Notes Agreement. Default Provisions – The loan agreement also includes customary events of default, including but not limited to the nonpayment of principal or interest, violations of covenants, material adverse changes, attachment, levy, restraint on business, cross-defaults on material indebtedness, bankruptcy, delisting, material judgments, misrepresentations, governmental approvals, and disposal of material assets. Upon an event of default, the outstanding loan balance and origination fees may become immediately due and payable prior to the mandatory repayment date. 2023 Secured Note The following summary of the 2023 Secured Note is qualified by the terms of the Convertible Notes Agreement which substitutes UniverXome for AgeX as the “borrower” and primary obligor pursuant to the 2023 Secured Note and the Security Agreement described below, and which amends certain provisions of the 2023 Secured Note. On March 13, 2023, AgeX and Juvenescence entered into a $10.0 million Secured Convertible Promissory Note (the “2023 Secured Note”) pursuant to which Juvenescence loaned to AgeX $10.0 million. AgeX used the loan proceeds to finance a $10.0 million loan to Legacy Serina which was converted into Legacy Serina common stock in connection with the Merger. On July 31, 2023, AgeX and Juvenescence entered into an amendment to the 2023 Secured Note that mirrors the amendments of the 2022 Secured Note pursuant to the Fourth Amendment of the 2022 Secured Note described above and also modified certain aspects of the conversion provisions of the 2023 Secured Note. The outstanding principal balance of the 2023 Secured Note was scheduled to become due and payable on March 13, 2026. In lieu of accrued interest, AgeX agreed to pay Juvenescence an origination fee in an amount equal to 7% of the loan funds disbursed to AgeX, which will accrue in two installments. The origination fee will become due and payable on the earliest to occur of (i) repayment of the 2023 Secured Note in whole or in part (provided that the origination fee shall be prorated for the amount of any partial repayment) and (ii) the acceleration of the maturity date of the 2023 Secured Note following an Event of Default as defined in the 2023 Secured Note. During July 2023, the 2023 Secured Note indebtedness, plus a portion of the accrued loan origination fees, was exchanged for shares of AgeX Series B Preferred Stock pursuant to the Exchange Agreement. The 2023 Secured Note included provisions allowing AgeX or Juvenescence to convert the loan balance and any accrued but unpaid origination fee into the Company common stock; however, those provisions were eliminated from the 2023 Note pursuant to the Convertible Notes Agreement. The 2023 Secured Note includes certain covenants that among other matters require financial reporting and impose certain restrictions on UniverXome that are substantially the same as those under the 2022 Secured Note. Security Agreement AgeX entered into a Security Agreement on February 14, 2022 in favor of Juvenescence as the secured party in connection with the 2022 Secured Note, and subsequently an Amended and Restated Security Agreement that amended the February 14, 2022 Security Agreement and added the 2023 Secured Note to the obligations secured by the Security Agreement. The Security Agreement, as so amended, granted Juvenescence a security interest in substantially all of the assets of AgeX, including a security interest in shares of AgeX subsidiaries that hold certain assets, as collateral for AgeX’s loan obligations. Pursuant to the Convertible Notes Agreement, UniverXome assumed AgeX’s obligations under the Security Agreement and Juvenescence released its security interests in the assets of AgeX and certain subsidiaries, including its security interests in the stock of UniverXome, the stock and assets of Merger Sub, the stock and assets of NeuroAirmid, and certain cGMP embryonic cell lines used to support the NeuroAirmid business, and any security interest that it might have in the stock and assets of Merger Sub and Legacy Serina, while retaining its security interest in the stock and assets of ReCyte and Reverse Bio and in AgeX assets transferred to UniverXome. If an Event of Default occurs under the 2022 Note, the 2023 Note or the Security Agreement, Juvenescence will have the right to foreclose on the assets pledged as collateral. Debt Issuance Costs The following table summarizes the debt balances net of unamortized deferred debt issuance costs by loan agreement as of September 30, 2024 (in thousands): Principal Origination Total Debt Unamortized Total Current 2022 Secured Note $ 9,692 $ 778 $ 10,470 $ (8) $ 10,462 Non-current 2023 Secured Note — 693 693 — 693 Total debt, net $ 9,692 $ 1,471 $ 11,163 $ (8) $ 11,155 Indemnification Agreements On March 13, 2023, AgeX executed that certain Letter of Indemnification in Lieu of or Supplemental to a Medallion Signature Guarantee (“Letter of Indemnification”), pursuant to which AgeX agreed to indemnify American Stock Transfer & Trust Company, LLC and its affiliates, successors and assigns (the “AST Indemnity”) from and against any and all claims, damages, liabilities or losses arising out of the transfer of all of the AgeX common stock held by Juvenescence to its wholly-owned subsidiary, Juvenescence US Corp. (the “Share Transfer”). In connection with AgeX’s execution of the Letter of Indemnification, AgeX and Juvenescence entered into that certain Transfer of Shares of AgeX Therapeutics, Inc. Common Stock – Indemnification Agreement, pursuant to which Juvenescence agreed to indemnify AgeX against any and all claims, damages, liabilities or losses arising out of the Share Transfer or AST Indemnity. On December 21, 2023, AgeX executed that certain Letter of Indemnification in Lieu of or Supplemental to a Medallion Signature Guarantee (the “ETC Letter of Indemnification”), pursuant to which AgeX agreed to indemnify Equiniti Trust Company LLC and its affiliates, successors and assigns (the “ETC Indemnity”) from and against any and all claims, damages, liabilities or losses arising out of the transfer 467,657 shares of AgeX common stock held by Juvenescence US Corp. to JuvVentures (the “JUV US Share Transfer”). In connection with AgeX’s execution of the ETC Letter of Indemnification, AgeX, Juvenescence, the ultimate parent company of Juvenescence US Corp. and JuvVentures, entered into that certain Transfer of Shares of AgeX Therapeutics, Inc. Common Stock – Indemnification Agreement, pursuant to which Juvenescence agreed to indemnify AgeX against any and all claims, damages, liabilities or losses arising out of the JUV US Share Transfer or ETC Indemnity.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company had the following liabilities measured at fair value on a recurring basis (in thousands): Balance at September 30, 2024 Level 1 Level 2 Level 3 Liabilities: Warrant liability $ 6,744 $ — $ — $ 6,744 Total $ 6,744 $ — $ — $ 6,744 Balance at December 31, 2023 Level 1 Level 2 Level 3 Liabilities: Convertible promissory notes $ 2,983 $ — $ — $ 2,983 Total $ 2,983 $ — $ — $ 2,983 Convertible Promissory Notes AgeX-Serina Note On March 15, 2023, Legacy Serina issued a Convertible Promissory Note (the “AgeX-Serina Note”) in the amount of $10.0 million to AgeX. The AgeX-Serina Note bore interest at 7% per annum and was scheduled to mature on March 15, 2026. Serina borrowed the $10.0 million pursuant to the AgeX-Serina Note to provide for general working capital needs. The AgeX-Serina Note was converted into shares of Legacy Serina common stock by AgeX in connection with the Merger. Serina evaluated the AgeX-Serina Note in accordance with ASC 815, Derivatives and Hedging , and determined it contains certain variable share settlement features tied to the price of a future financing which were not considered clearly and closely related to the host instrument. These provisions included automatic conversion upon the event of a Qualified Financing, the Holder’s option to convert the AgeX-Serina Note upon a Non-Qualified Financing, and the Holder’s option to convert or request repayment upon sale of Serina. The AgeX-Serina Note also contained a Change in Control Put and a Default Put which were not clearly and closely related to the host instrument. Serina elected to initially and subsequently measure the AgeX-Serina Note in its entirety at fair value, with changes in fair value recognized in earnings. The fair value inception date adjustment on the instrument is recorded as a component of other income in Serina’s condensed consolidated statements of operations. On March 15, 2023, the fair value of the $10.0 million principal amount under the AgeX-Serina Note was evaluated and an adjustment to reduce the fair value of the principal balance to $7.8 million was recorded at that time. The change in fair value recognized during the three months ended September 30, 2024 and 2023 amounted to zero and $2.2 million gain, respectively. The change in fair value recognized during the nine months ended September 30, 2024 and 2023 amounted to $7.0 million loss and a $3.9 million gain, respectively. Legacy Serina Convertible Notes From September 2022 through February 2023, Legacy Serina issued interest-bearing Convertible Promissory Notes (the “Legacy Serina Convertible Notes”) to various investors in the principal amount of $1.5 million. The Legacy Serina Convertible Notes bore interest at 6% per annum and were scheduled to become due and payable by Legacy Serina two years from the respective issuance dates. The Legacy Serina Convertible Notes provided that upon a Qualified Equity Financing event in which Serina sells shares of Preferred Stock for aggregate proceeds of at least $15.0 million, the principal and outstanding interest on the Legacy Serina Convertible Notes would automatically convert into shares of Legacy Serina’s Preferred Stock issued in the Qualified Financing at a conversion price of the lesser of (i) a 20% discount to the price paid by purchasers in the Qualified Financing and (ii) the quotient resulted from dividing $100 million by the fully diluted capitalization of Legacy Serina immediately prior to the Qualified Financing. If Serina were to enter into a Non-Qualified Equity Financing (less than $15 million in proceeds), the holders of the Legacy Serina Convertible notes would have had the option to convert the Legacy Serina Convertible Notes into shares of Serina’s Preferred Stock issued in the Non-Qualified Financing at the price paid per share. Serina had the right to optionally convert the Legacy Serina Convertible Notes into Legacy Serina Series A-5 Preferred Stock at a price of $13.31 per share, and a warrant to purchase shares of Legacy Serina Series A-5 Preferred Stock with an exercise price of $20.47, and an expiration date of December 31, 2024. If a Change in Control or an IPO were to occur prior to a Qualified Financing, then the holders of Legacy Serina Convertible Notes would have had the option to convert outstanding principal and interest into common stock at a price per share equal to an amount obtained by dividing (i) the Post-Money Valuation Cap ($100,000,000) by (ii) the Fully Diluted Capitalization, as such terms were defined in the Legacy Serina Convertible Notes, immediately prior to the conversion. Upon a change in control, the Legacy Serina Convertible Note holders were entitled to require Legacy Serina to repay the outstanding principal and accrued but unpaid interest in cash. Serina evaluated the Legacy Serina Convertible Notes in accordance with ASC Topic 815, Derivatives and Hedging , and determined they contained certain variable share settlement features tied to the price of a future financing which were not considered clearly and closely related to the host instruments. These provisions included mandatory conversion upon the event of a Qualified Financing and the holder’s option to convert the Legacy Serina Convertible Notes upon a Non-Qualified Financing. The Legacy Serina Convertible Notes also contained a Change in Control Put and a Default Put which were not clearly and closely related to the host instrument. Serina elected to initially and subsequently measure the Legacy Serina Convertible Notes in their entirety at fair value, with changes in fair value recognized in earnings. The fair value inception date adjustment on the instrument is recorded as a component of other income in Serina’s condensed consolidated statements of operations. The change in fair value of the instrument since inception date is recorded on a separate line item as a component of other income in Serina’s condensed consolidated statements of operations. On July 26, 2023, all of the Legacy Serina Convertible Notes were converted into 115,171 shares of Legacy Serina Series A-5 Preferred Stock. As provided for in the note agreements, the holders of the Legacy Serina Convertible Notes also received warrants to purchase an additional 115,171 shares of Legacy Serina Series A-5 Preferred Stock. See Note 7, Stockholders’ Equity/(Deficit) for discussion of Legacy Serina warrants assumed by the Company upon consummation of the Merger on March 26, 2024. The change in fair value for the three and nine months ended September 30, 2023 was losses of $0.4 million and $0.6 million, respectively. The following is a reconciliation of the beginning and ending balances for the AgeX-Serina Note and the Legacy Serina Convertible Notes liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the nine months ended September 30, 2024 and 2023 (in thousands): AgeX-Serina Serina Balance as of December 31, 2023 $ 2,983 $ — Notes converted into common stock (10,000) — Change in fair value 7,017 — Balance as of September 30, 2024 $ — $ — AgeX-Serina Serina Balance as of December 31, 2022 $ — $ 1,617 Convertible debt issuance 10,000 100 Inception adjustment (2,240) — Notes converted to Series A-5 pref. stock — (963) Notes converted to warrants — (175) Change in fair value (3,898) (579) Balance as of September 30, 2023 $ 3,862 $ — Warrant Liability The Company classifies the Post-Merger Warrants and the Incentive Warrants (collectively, the “Merger Warrants”) as liabilities. At the end of each reporting period, changes in fair value during the period are recognized as a component of other income (expense), net within the consolidated statements of operations. The change in fair value of these warrant liabilities recognized during the three months period ended September 30, 2024 and 2023 amounted to $6.7 million and $0.6 million gain, respectively. The change in fair value recognized during the nine months period ended September 30, 2024 and 2023 amounted to $10.4 million and $1.1 million gain. The Company will continue adjusting the warrant liability for changes in fair value until the earlier of a) the exercise or expiration of the warrants or b) the redemption of the warrants, at which time the warrants will be reclassified to additional paid-in capital. On June 6, 2024, Juvenescence exercised Post-Merger Warrants to purchase 377,865 shares of the Company’s common stock at an exercise price of $13.20 per share, for a total purchase price of $5.0 million. In addition to the shares of common stock, upon exercise of the Post-Merger Warrants, Juvenescence also received Incentive Warrants to purchase 377,865 shares of common stock with an exercise price of $18.00 per share that expire on March 26, 2028. As of September 30, 2024, Juvenescence held 755,728 Post-Merger Warrants and 377,865 Incentive Warrants. Prior to the Merger, the Company classified certain of the Assumed Warrants as liabilities. Upon consummation of the Merger, all Assumed Warrants were adjusted such that after the Merger each such Assumed Warrant represents the right to purchase a number of shares of Company common stock equal to 0.97682654 multiplied by the number of shares of Legacy Serina common stock issuable upon the exercise of such Assumed Warrant prior to the Merger. The Assumed Warrants have an exercise price of $20.47 per share and expire on December 31, 2024. The following is a reconciliation of the beginning and ending balances of warrant liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the nine months ended September 30, 2024 and 2023 (in thousands): Merger Assumed Balance as of December 31, 2023 $ — $ — Fair value at inception 18,501 — Exercise (1,372) — Change in fair value (10,385) — Balance as of September 30, 2024 $ 6,744 $ — Balance as of December 31, 2022 $ — $ 1,077 Change in fair value — (1,059) Balance as of September 30, 2023 $ — $ 18 The Company estimates the fair value of warrants using the Black-Scholes-Merton option pricing model with the following assumptions at the reporting date: September 30, 2024 September 30, 2023 Expected volatility 99.15% -123.57% 97.0% - 99% Expected term (in years) 0.8 – 3.49 0.30 - 0.8 Risk-free interest rate 3.58% - 4.45% 5.09% - 5.55% Expected dividend yield 0.00 % 0.00 % Expected volatility for the periods post Merger consummation on March 26, 2024 is based on historical volatility of the Company, while pre Merger periods use the historical volatility of comparable public entities as an estimate. The Company estimates the expected term using time to expiration of the warrant. The risk-free interest rate is the yield on a U.S. Treasury zero-coupon issue with a remaining term equal to or approximating the expected term of the warrant. See Note 7, Stockholders’ Equity/(Deficit)

Stockholders_ Equity_(Deficit)

Stockholders’ Equity/(Deficit)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Stockholders’ Equity/(Deficit)	Stockholders’ Equity/(Deficit) Redeemable Convertible Preferred Stock All Legacy Serena redeemable convertible preferred stock was converted into common stock as described in Note 1. The table below presents Legacy Serina redeemable convertible preferred stock information adjusted for the 0.97682654 Exchange Ratio as of December 31, 2023 (in thousands other than per share price). Preference Order Designation Shares Shares Issue Price Carrying Value Liquidation Preference #1 Series A Preferred Stock 391 391 $ 5.12 $ 2,000 $ 2,002 #2 Series A-1 Preferred Stock 293 293 6.82 $ 1,998 $ 1,998 #3 Series A-2 Preferred Stock 1,091 1,091 10.17 $ 11,085 $ 11,095 #4 Series A-3 Preferred Stock 487 487 12.80 $ 6,240 $ 6,234 #5 Series A-4 Preferred Stock 702 702 13.31 $ 9,347 $ 9,344 #6 Series A-5 Preferred Stock 1,954 474 13.31 $ 5,734 $ 6,309 4,918 3,438 $ 36,404 $ 36,982 Common Stock The holders of the Company’s common stock are entitled to receive ratably dividends when, as, and if declared by the Board of Directors out of funds legally available. Upon liquidation, dissolution, or winding up, the holders of Company common stock are entitled to receive ratably the net assets available after the payment of all debts and other liabilities and subject to the prior rights of the Company outstanding preferred shares, if any. The holders of common stock are entitled to one vote for each share held on all matters submitted to a vote of the Company stockholders. The holders of common stock have no preemptive, subscription, or redemption rights. The outstanding shares of common stock are fully paid and non-assessable. Warrants Merger Warrants On March 19, 2024, the Company issued to each holder of AgeX common stock as of the dividend record date, March 18, 2024, three warrants (“Post-Merger Warrants”) for each five shares of AgeX common stock held by such stockholder. Each Post-Merger Warrant is exercisable for one “Unit” at a price equal to $13.20 per Unit and will expire on July 31, 2025. Each Unit will consist of (i) one share of Company common stock and (ii) one warrant (“Incentive Warrant”). Each Incentive Warrant is exercisable for one share of Company common stock at a price equal to $18.00 per warrant and will expire on the four-year anniversary of the closing date of the Merger. As of September 30, 2024 there were 1,122,419 Post-Merger Warrants issued and outstanding. The Company classifies the Post-Merger Warrants and the Incentive Warrants as liabilities. See Note 6, Fair Value Measurements , regarding accounting for warrant liabilities. The Side Letter provides, among other things, that Juvenescence will exercise all Post-Merger Warrants it holds to provide the Company an additional $15.0 million in capital according to the following schedule: (x) at least one-third on or before May 31, 2024, (y) at least one-third on or before November 30, 2024, and (z) at least one-third on or before June 30, 2025. Juvenescence received 1,133,593 Post-Merger Warrants. On June 6, 2024, Juvenescence exercised Post-Merger Warrants to purchase 377,865 shares of the Company’s common stock at an exercise price of $13.20 per share, for a total purchase price of $5.0 million. In addition to the shares of common stock, upon exercise of the Post-Merger Warrants, Juvenescence also received Incentive Warrants to purchase 377,865 shares of common stock with an exercise price of $18.00 per share that expire on March 26, 2028. As of September 30, 2024, Juvenescence held 755,728 Post-Merger Warrants and 377,865 Incentive Warrants. Details of Merger Warrant activity for the nine months ended September 30, 2024 are as follows: Post-Merger Warrants Incentive Warrants Balance at December 31, 2023 - - Warrants issued 1,500 378 Warrants exercised (378) - Warrants outstanding at September 30, 2024 1,122 378 Assumed Warrants Upon consummation of the Merger, the Company assumed the outstanding, unexercised warrants to purchase Legacy Serina capital stock (the “Assumed Warrants”), which were adjusted such that after the Merger each such Assumed Warrant represents the right to purchase a number of shares of Company common stock equal to 0.97682654 multiplied by the number of shares of Legacy Serina common stock issuable upon the exercise of such Assumed Warrant prior to the Merger. There were 473,681 Assumed Warrants issued and outstanding as of September 30, 2024 with an exercise price of $20.47 per share and that expire on December 31, 2024. Of the Assumed Warrants, 358,511 warrants which were granted prior to 2021 contain both put and call options. The Company may call the warrants at any time following the date the warrants become exercisable. These warrants are accordingly accounted for as a liability and remeasured to fair value at each reporting period. The 115,170 warrants with a fair value of $0.2 million were accounted for as equity as they were issued in connection with the conversion of promissory notes to equity during 2023. See Note 6, Fair Value Measurements , regarding accounting for warrant liabilities. Former AgeX Warrants

Stock-Based Awards

Stock-Based Awards	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Awards	Stock-Based Awards Equity Incentive Plan Awards Serina 2024 Inducement Equity Plan On August 15, 2024, the Company’s Board of Directors adopted the 2024 Inducement Equity Plan, (the “2024 Inducement Plan”). Under the 2024 Inducement Plan, the Company has reserved 1,000,000 shares of common stock for the grant to new employees or non-employee directors of stock options or the sale of restricted stock or for the settlement of restricted stock units which are hypothetical units issued with reference to common stock (“RSUs”). The Company may also grant stock appreciation rights (“SARs”) under the Inducement Plan. The Plan also permits the Company to issue such other securities as its Board of Directors or the Compensation Committee administering the Inducement Plan may determine. As of September 30, 2024, no options were granted from the plan. Options under this plan primarily have a ten-year life, vest and therefore become exercisable in periodic installments as determined by the Board or Committee or based upon the attainment of a Performance Goal or the occurrence of a specified event. The vesting provisions of individual options may vary. Serina 2024 Equity Incentive Plan On March 27, 2024, the Company’s Board of Directors adopted the 2024 Equity Incentive Plan, (the “2024 Incentive Plan”). Under the 2024 Incentive Plan, the Company has reserved 1,725,000 shares of common stock for the grant to employees, directors, and consultants of stock options or SARs, or the sale of restricted stock or for the settlement of RSUs. The 2024 Incentive Plan also permits the Company to issue such other securities as its Board of Directors or the Compensation Committee administering the Incentive Plan may determine. Options under this plan primarily have a ten-year life, vest and therefore become exercisable in periodic installments as determined by the Board or Committee or based upon the attainment of a Performance Goal or the occurrence of a specified event. The vesting provisions of individual options may vary. As of September 30, 2024, options to purchase 1,652,792 shares of the Company common stock were outstanding under the 2024 Incentive Plan, which options have an exercise prices ranging from $6.66 to $14.87 per share and expire on dates ranging from March 2034 to September 2034. As of September 30, 2024, zero stock options under the 2024 Incentive Plan had been exercised. Serina 2017 Stock Option Plan In 2017, the Legacy Serina’s Board of Directors adopted the Serina Therapeutics, Inc. 2017 Stock Option Plan (the “2017 Option Plan”) that provides for the granting of stock options to employees. Pursuant to the Merger Agreement, the Company assumed the outstanding stock options granted by Legacy Serina under the 2017 Option Plan. The options were adjusted such that after the Merger each such option granted and outstanding under the 2017 Option Plan represents the right to purchase a number of shares of Company common stock equal to 0.97682654 multiplied by the number of shares of Legacy Serina common stock issuable upon the exercise of such options granted and outstanding under the 2017 Option Plan prior to the Merger. As of September 30, 2024, options to purchase 1,551,411 shares of Company common stock were outstanding under the 2017 Option Plan, which options have an exercise price of $0.06 and expire on dates ranging from October 2024 to December 2032. As of September 30, 2024, 164,693 stock options under the 2017 Option Plan had been exercised. Pursuant to the Merger Agreement, no further options shall be granted under the 2017 Option Plan. Serina 2017 Equity Incentive Plan Under the Serina 2017 Equity Incentive Plan, as amended (the “2017 Incentive Plan” formerly AgeX 2017 Equity Incentive Plan), the Company has reserved 241,683 shares of common stock for the grant of stock options or the sale of Restricted Stock or for the settlement of RSUs. Pursuant to the Merger Agreement, all “out of the money” options (meaning those options with an exercise price equal to or greater than $0.7751 on a pre-reverse stock split basis) were canceled and no further options shall be granted under the 2017 Incentive Plan. The “in the money” stock options were adjusted for the reverse stock split ratio of 1 for 35.17. As of September 30, 2024, there were 11,359 stock options granted and outstanding with exercise prices ranging from $13.19 to $25.96 per share and expiration dates ranging from November 2024 to January 2034. As of September 30, 2024, no stock options under the 2017 Incentive Plan had been exercised. A summary of Serina stock option activity under all plans and related information are as follows (in thousands, except weighted average exercise price): Number Weighted- Balance at December 31, 2023 1,716 $0.06 Assumption of options in connection with the Merger 12 $24.04 Granted 1,653 $9.16 Exercised (164) $0.06 Cancelled/Forfeited (1) $26.48 Balance at September 30, 2024 3,216 $4.82 Options exercisable at September 30, 2024 1,598 $0.49 Stock-based Compensation Expense During the nine months ended September 30, 2024, the Company granted stock options to purchase 1,652,792 shares of common stock to certain employees and consultants under the 2024 Incentive Plan, with a weighted average grant date fair value of $7.95 per share. Total unrecognized compensation cost related to unvested stock option grants of $11.5 million as of September 30, 2024 is expected to be recognized over weighted average period of 1.8 years. Stock-based compensation expense has been allocated to operating expenses as follows (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 210 $ — $ 343 $ — General and administrative 886 — 1,264 25 Total stock-based compensation expense $ 1,096 $ — $ 1,607 $ 25 The fair value of each option award is estimated on the date of grant using a Black-Scholes option pricing model applying the weighted-average assumptions including the market price of the underlying common stock, expected option life, risk-free interest rates, volatility, and dividend yield. The assumptions that were used to calculate the grant date fair value of employee and non-employee stock option grants for the three and nine months ended September 30, 2024 were as follows: Three Months Ended Nine Months Ended 2024 (1) 2023 (2) 2024 (1) 2023 (2) Expected life (in years) 5.9 - 6.1 — 5.0 - 6.1 — Volatility 117.91% - 118.33% — 113.08% - 118.33% — Risk-free interest rates 3.54% - 4.14% — 3.54% - 4.65% — Dividend yield — — — — (1) Relates to stock options granted under the Serina 2024 Equity Incentive Plan during the period. (2) There were no stock options granted during the period. The Company does not recognize deferred income taxes for incentive stock option compensation expense and records a tax deduction only when a disqualified disposition has occurred.

Profit Sharing Plan

Profit Sharing Plan	9 Months Ended
	Sep. 30, 2024
Postemployment Benefits [Abstract]
Profit Sharing Plan	Profit Sharing Plan Through its wholly owned subsidiary Legacy Serina, the Company has established a 401(k) profit sharing plan (the “PSP”) for all eligible employees of the Company. The PSP provides for eligible employee contributions subject to certain annual Internal Revenue Code limits. For participants who are age 50 or older during any calendar year, additional employee contributions are allowed under the PSP, subject to Internal Revenue Code limits.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes for interim periods is determined using an estimated annual effective tax rate in accordance with ASC 740-270 , Income Taxes, Interim Reporting . The effective tax rate may be subject to fluctuations during the year as new information is obtained, which may affect the assumptions used to estimate the annual effective tax rate, including factors such as valuation allowances against deferred tax assets, the recognition or de-recognition of tax benefits related to uncertain tax positions, if any, and changes in or the interpretation of tax laws in jurisdictions where the Company conducts business. Due to losses incurred for all periods presented, the Company did not record a provision or benefit for income taxes. A valuation allowance is provided when it is more likely than not that some portion of the deferred tax assets will not be realized. The Company established a full valuation allowance for all of its deferred tax assets for all periods presented due to the uncertainty of realizing future tax benefits from its net operating loss carryforwards and other deferred tax assets.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Facilities and Equipment Lease Agreements The Company leases its lab and office facilities in Huntsville, Alabama for various terms under long-term, non-cancelable operating lease agreements. The leases expire on various dates from October 2025 through January 2028 and provide for renewal periods of two years. For the office lease, the Company has elected not to apply the recognition requirements under ASC 842, as the lease cost, if recognized under ASC 842, would not be materially different from the straight-line basis over the lease term. The Company also leases laboratory equipment under a long-term, non-cancelable operating lease which expired in September 2024 and was subsequently replaced by a month-to-month cancellable agreement. The Company also leases two pieces of equipment for various terms under long-term, non-cancelable finance lease agreements. One of the two finance leases expired in September 2024 with ownership passed on to the Company in accordance with the original term of the lease agreement, while the other finance lease expires in February 2025. Supplemental cash flow information related to leases is as follows (in thousands): Nine Months Ended 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 166 $ 132 Operating cash flows from finance leases $ 2 $ 4 Financing cash flows from finance leases $ 34 $ 35 Right-of-use assets obtained in exchange for lease obligations Operating leases $ — $ 672 Finance leases $ — $ — Supplemental balance sheet information related to leases was as follows (in thousands other than weighted average remaining lease term and discount rates): September 30, 2024 December 31, 2023 Operating lease Right-of-use assets $ 862 $ 862 Accumulated Amortization (353) (196) Right-of-use asset, net $ 509 $ 666 Right-of-use lease liability, current $ 197 $ 214 Right-of-use lease liability, noncurrent 312 461 Total operating lease liabilities $ 509 $ 675 Finance leases Right-of-use assets $ 163 $ 163 Accumulated Amortization (71) (53) Right-of-use asset, net $ 92 $ 110 Right-of-use lease liability, current $ 1 $ 36 Right-of-use lease liability, noncurrent — 1 Total finance lease liabilities $ 1 $ 37 Weighted average remaining lease term Operating lease 2.78 years 3.32 years Finance leases 0.42 years 0.64 years Weighted average discount rate Operating lease 6.67 % 6.67 % Finance leases 6.67 % 11.9 % The following is a maturity analysis of the annual undiscounted cash flows of the operating lease liabilities as of September 30, 2024 (in thousands): Operating Leases Three months ending December 31, 2024 $ 56 Year ending December 31, 2025 217 Year ending December 31, 2026 159 Year ending December 31, 2027 117 Thereafter 10 Total undiscounted lease payments 559 Less: imputed interest (50) Total lease obligations 509 Less: current portion (197) Long-term lease obligations $ 312 Litigation – General The Company is subject to various claims and contingencies in the ordinary course of its business, including those related to litigation, business transactions, employee-related matters, and others. When the Company is aware of a claim or potential claim, it assesses the likelihood of any loss or exposure. If it is probable that a loss will result and the amount of the loss can be reasonably estimated, the Company will record a liability for the loss. If the loss is not probable or the amount of the loss cannot be reasonably estimated, the Company discloses the claim if the likelihood of a potential loss is reasonably possible and the amount involved could be material. The Company is not aware of any claims likely to have a material adverse effect on its financial condition or results of operations. Tax Filings The Company's tax filings are subject to audit by taxing authorities in jurisdictions where it conducts business. These audits may result in assessments of additional taxes that are subsequently resolved with the authorities or potentially through the courts. Management believes the Company has adequately provided for any ultimate amounts that are likely to result from these audits; however, final assessments, if any, could be significantly different than the amounts recorded in the condensed consolidated interim financial statements. Employment Contracts The Company has entered into employment contracts with certain executive officers. Under the provisions of the contracts, the Company may be required to incur severance obligations for matters relating to changes in control, as defined, and involuntary terminations. Partnership with Enable During May 2024, the Company entered into a partnership with Enable Injections, Inc. (“Enable”), a healthcare innovation company developing and manufacturing the enFuse® wearable drug delivery to develop and commercialize SER-252 (POZ-apomorphine) in combination with enFuse for the treatment of Parkinson’s disease. The Company will develop and commercialize SER-252 (POZ-apomorphine) in combination with enFuse TM for the treatment of Parkinson’s disease. The enFuse TM wearable technology from Enable is designed to overcome both IV infusion and other subcutaneous administration method shortcomings through fast, simple, and convenient delivery, benefiting patients, providers, as well as payers, with the ability for at home self-administration. The Company anticipates submission of an Investigational New Drug (IND) application to the U.S. Food and Drug Administration with plans to initiate a Phase 1 clinical trial in advanced Parkinson’s disease patients in 2025. The Company paid $2.0 million in May 2024 for the Enable arrangement and will amortize the cost on a straight-line basis until December 2025. Indemnification In the normal course of business, the Company may provide indemnifications of varying scope under the Company’s agreements with other companies or consultants, typically for the Company’s research and development programs. Pursuant to these agreements, the Company will generally agree to indemnify, hold harmless, and reimburse the indemnified parties for losses and expenses suffered or incurred by the indemnified parties arising from claims of third parties in connection with the Company’s research and development. Indemnification provisions could also cover third-party infringement claims with respect to patent rights, copyrights, or other intellectual property licensed from the Company to third parties. Office and laboratory leases will also generally indemnify the lessor with respect to certain matters that may arise during the term of the lease. The Registration Rights Agreement between Juvenescence and the Company includes indemnification provisions pursuant to which the parties will indemnify each other from certain liabilities in connection with the registration, offer, and sale of securities under a registration statement, including liabilities arising under the Securities Act. The Company has also agreed to provide the AST Indemnity and the ETC Indemnity pursuant to the Letter of Indemnification described in Note 5, Related Party Transactions . The term of these indemnification obligations will generally continue in effect after the termination or expiration of the particular license, lease, or agreement to which they relate. The potential future payments the Company could be required to make under these indemnification agreements will generally not be subject to any specified maximum amount. Historically, the Company has not been subject to any claims or demands for indemnification. The Company also maintains various liability insurance policies that limit the Company’s financial exposure and in the case of the AST Indemnity and the ETC Indemnity the Company has received a cross-indemnity from Juvenescence against all claims, damages, liabilities or losses arising out of the AST Indemnity and the ETC Indemnity. As a result, the Company believes the fair value of these indemnification agreements is minimal. Accordingly, the Company has not recorded any liabilities for these agreements to date.

Net Earnings (Loss) Per Common

Net Earnings (Loss) Per Common Share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Net Earnings (Loss) Per Common Share	Net Earnings (Loss) Per Common Share Net earnings (loss) per common share is calculated in accordance with ASC 260, Earnings Per Share . Basic and diluted net earnings (loss) per common share attributable to common stockholders is calculated for the periods presented (in thousands) as follows. Three Months Ended Nine Months Ended 2024 2023 2024 2023 Basic net earnings (loss) per common share allocable to common stockholders NUMERATOR Net income (loss) 1,383 1,752 (8,455) 4,218 Less: net loss attributable to noncontrolling interest 27 — 54 — Net earnings (loss) attributable to Serina 1,410 1,752 (8,401) 4,218 DENOMINATOR Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share 8,851 2,190 6,774 2,176 Basic net earnings (loss) per common share allocable to common stockholders $ 0.16 $ 0.80 $ (1.24) $ 1.94 Diluted net earnings (loss) per common share allocable to common stockholders NUMERATOR Net earnings (loss) attributable to Serina 1,410 1,752 (8,401) 4,218 Add back: interest on convertible promissory notes — 6 — 83 Net earnings (loss) allocable to common stockholders 1,410 1,758 (8,401) 4,301 DENOMINATOR Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share 8,851 2,190 6,774 2,176 Add: dilutive effect of stock options 1,900 1,840 — 1,820 Add: dilutive effect of warrants — — — — Add: dilutive effect of common stock issued for convertible promissory notes — 115 — 113 Add: dilutive effect of redeemable convertible preferred stock — 3,439 — 3,439 Weighted-average shares of common stock outstanding used to calculate diluted net earnings (loss) per common share 10,751 7,584 6,774 7,548 Diluted net earnings (loss) per common share attributable to common stockholders 0.13 0.23 (1.24) 0.57 The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted net earnings (loss) per common share because to do so would be anti-dilutive: Three and Nine months ended September 30, 2024 Redeemable convertible preferred stock — — Convertible promissory notes — — Stock options 837 3,216 Warrants 3,226 3,226 Total anti-dilutive securities 4,063 6,442

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Nothing to report.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 1,410	$ 1,752	$ (8,401)	$ 4,218

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Principles of consolidation	Principles of consolidation The consolidated financial statements include the accounts of the Company and its subsidiaries in which the Company has a controlling financial interest. For consolidated entities where the Company has less than 100% of ownership, the Company records net loss attributable to noncontrolling interest on the consolidated statement of operations equal to the percentage of the ownership interest retained in such entities by the respective noncontrolling parties. The noncontrolling interest is reflected as a separate element of stockholders’ equity (deficit) on the Company’s consolidated balance sheets. Any material intercompany transactions and balances have been eliminated upon consolidation. The Company assesses whether it is the primary beneficiary of a variable interest entity (“VIE”) at the inception of the arrangement and at each reporting date. This assessment is based on its power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the Company’s obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. If the entity is within the scope of the variable interest model and meets the definition of a VIE, the Company considers whether it must consolidate the VIE or provide additional disclosures regarding its involvement with the VIE. If the Company determines that it is the primary beneficiary of the VIE, the Company will consolidate the VIE. This analysis is performed at the initial investment in the entity or upon any reconsideration event. For entities the Company holds as an equity investment that are not consolidated under the VIE model, the Company will consider whether its investment constitutes a controlling financial interest in the entity and therefore should be considered for consolidation under the voting interest model. The Company has five subsidiaries: Legacy Serina and UniverXome, which are wholly-owned subsidiaries, and ReCyte Therapeutics, Inc. (“ReCyte”), Reverse Bioengineering, Inc. (“Reverse Bio”), and NeuroAirmid Therapeutics, Inc. (“NeuroAirmid”). Following the Merger, the Company is primarily focused on developing Legacy Serina’s product candidates which are described elsewhere in this Report. Prior to the Merger, on March 26, 2024, pursuant to the Merger Agreement, the Company contributed all of its stock in Reverse Bio and ReCyte, along with substantially all of the assets (other than the stock of NeuroAirmid) of the Company to UniverXome. In exchange for the contribution of those assets, UniverXome assumed certain liabilities, including all of the Company’s indebtedness to Juvenescence. UniverXome owns 94.8% of the outstanding capital stock of ReCyte. ReCyte owns certain pre-clinical research and development assets involving stem cell-derived endothelial and cardiovascular related progenitor cells for the treatment of vascular disorders and ischemic conditions. The Company owns 100% of the outstanding capital of Reverse Bio through UniverXome. Reverse Bio owns assets involved in partial cellular reprogramming using its iTR™ technology with the intent to revert aged or diseased cells to a healthy and functional state. NeuroAirmid is jointly owned by the Company and certain researchers from the University of California and was organized to pursue certain cell therapies, focusing initially on Huntington’s Disease. The Company owns 47.5% of the outstanding capital stock of NeuroAirmid. The Company consolidates NeuroAirmid despite not having majority ownership interest as it has the ability to influence decision making and financial results through contractual rights and obligations as per Accounting Standards Codification (“ASC”) 810, Consolidation
Financial Statement Reclassification	Financial Statement Reclassification Certain account balances from prior periods have been reclassified in these condensed consolidated financial statements to conform to current period classifications. Accounts payable and accrued expenses, previously presented as one line item on the condensed consolidated balance sheet, are now presented separately given the materiality of the balances. The current portion of operating and finance lease liabilities were also reclassified to other current liabilities. Additionally, the Non-cash interest expense on convertible promissory note, previously combined with accrued expenses in the operating activities section of the condensed consolidated statement of cash flows, is now presented separately within operating activities. These reclassifications had no effect on the reported results of operations or financial position.
Use of estimates	Use of estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect (i) the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and (ii) the reported amounts of revenues and expenses during the reporting period, in each case with consideration given to materiality. Significant estimates and assumptions
Concentration of credit risk and other risks and uncertainties	Concentration of credit risk and other risks and uncertainties Financial instruments that potentially subject the Company to concentrations of risk consist principally of cash equivalents. The Company maintains its cash deposits in Federal Deposit Insurance Corporation (“FDIC”) insured financial institutions and may at times hold investments at Securities Investor Protection Corporation (“SIPC”) insured broker-dealers. At times, the balances in these accounts may be in excess of FDIC and SIPC insured limits. At September 30, 2024 and December 31, 2023, cash and cash equivalents deposits in excess of FDIC limits were $0.9 million and zero, respectively, and investments and deposits in excess of SIPC limits were $1.3 million and $7.3 million, respectively. Product candidates developed by the Company and its subsidiaries will require approvals or clearances from the United States Food and Drug Administration (“FDA”) or foreign regulatory agencies prior to commercial sales. There can be no assurance that any of the product candidates being developed or planned to be developed by the Company or its subsidiaries will receive any of the required approvals or clearances. If regulatory approval or clearance were to be denied or any such approval or clearance was to be delayed, it would have a material adverse impact on the Company.
Fair value measurements of financial instruments	Fair value measurements of financial instruments The Company has adopted ASC Topic 820, Fair Value Measurement , for certain financial instruments measured as fair value on a recurring basis. ASC Topic 820 defines fair value, establishes a framework for measuring fair value in accordance with accounting principles generally accepted in the United States, and expands disclosures about fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of inputs that may be used to measure fair value are as follows: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities. Level 2 inputs also include non-binding market consensus prices that can be corroborated with observable market data, as well as quoted prices that were adjusted for security-specific restrictions. • Level 3: Unobservable inputs to the valuation methodology are significant to the measurement of the fair value of assets or liabilities. Level 3 inputs also include non-binding market consensus prices or non-binding broker quotes that we were unable to corroborate with observable market data.
Accounting for warrants	Accounting for warrants The Company determines the accounting classification of warrants it issues, as either liability or equity, by first assessing whether the warrants meet liability classification in accordance with ASC 480-10, Accounting for Certain Financial Instruments with Characteristics of both Liabilities and Equity , then in accordance with ASC 815-40, Accounting for Derivative Financial Instruments Indexed to, and Potentially Settled in, a Company’s Own Stock . Under ASC 480, warrants are considered liability classified if the warrants are mandatorily redeemable, obligate the Company to settle the warrants or the underlying shares by paying cash or other assets, or warrants that must or may require settlement by issuing a variable number of shares. If warrants do not meet liability classification under ASC 480-10, the Company assesses the requirements under ASC 815-40, which states that contracts that require or may require the issuer to settle the contract for cash are liabilities recorded at fair value, irrespective of the likelihood of the transaction occurring that triggers the net cash settlement feature. If the warrants do not require liability classification under ASC 815-40, and in order to conclude equity classification, the Company also assesses whether the warrants are indexed to its common stock and whether the warrants are classified as equity under ASC 815-40 or other applicable U.S. GAAP. After all relevant assessments, the Company concludes whether the warrants are classified as liability or equity. Liability classified warrants require fair value accounting at issuance and subsequent to initial issuance with all changes in fair value after the issuance date recorded in the consolidated statements of operations. Equity classified warrants only require fair value accounting at issuance with no changes recognized subsequent to the issuance date. See Notes 5, Related Party Transactions and 6, Fair Value Measurements
Redeemable convertible preferred stock	Redeemable convertible preferred stock
Cash, cash equivalents, and restricted cash	Cash, cash equivalents, and restricted cash A reconciliation of the Company’s cash and cash equivalents in the condensed consolidated balance sheets to cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows for all periods presented is as follows (in thousands): September 30, 2024 December 31, 2023 Cash and cash equivalents $ 3,185 $ 7,619 Restricted cash (1) 50 — Cash, cash equivalents, and restricted cash as shown in the condensed consolidated statements of cash flows $ 3,235 $ 7,619 (1)
Property and equipment, net	Property and equipment, net
Leases	Leases The Company determines if an arrangement is a lease at inception. Leases are classified as either financing or operating, with classification affecting the pattern of expense recognition in the consolidated statements of operations. The Company recognizes right-of-use (“ROU”) assets and lease liabilities for leases with terms greater than twelve months in the consolidated balance sheet. ROU assets represent an entity’s right to use an underlying asset during the lease term and lease liabilities represent an entity’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. If the lease agreement does not provide an implicit rate in the contract, the lessee uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. For such purposes, the lease term applied may include options to extend or terminate the lease when it is reasonably certain that the Company or a subsidiary will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.
Intangible assets, net	Intangible assets, net Intangible assets, consisting primarily of acquired in-process research and development (“IPR&D”) with alternative future use and patents, are stated at acquired cost, less accumulated amortization. Amortization expense is computed using the straight-line method over the estimated useful life of 10 years. See Note 3, Selected Balance Sheet Components
Impairment of long-lived assets	Impairment of long-lived assets The Company assesses the impairment of long-lived assets whenever events or changes in circumstances indicate that such assets might be impaired and the carrying value may not be recoverable. If events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the expected undiscounted future cash flows attributable to the asset are less than the carrying amount of the asset, an impairment loss, equal to the excess of the carrying value of the asset over its fair value, is recorded. There has been no impairment of long-lived assets for the accounting periods presented.
Grant revenues	Grant revenues The Company receives government grants that reimburse the Company for certain allowable costs for funded projects. Grant revenue is recognized in the condensed consolidated statement of operations on a systematic basis over the period in which the Company recognizes qualified research and development costs that grant is intended to compensate and there is reasonable assurance that the Company will meet the terms and conditions of the grant. The Company accounts for grants received to perform research and development services in accordance with ASC 730-20, Research and Development Arrangements. At the inception of the grant, we perform an assessment as to whether the grant is a liability or a contract to perform research and development services for others. If the Company or a subsidiary receiving the grant is obligated to repay the grant funds to the grantor regardless of the outcome of the research and development activities, then the Company is required to estimate and recognize that liability. Alternatively, if the Company or a subsidiary receiving the grant is not required to repay, or if it is required to repay the grant funds only if the research and development activities are successful, then the grant agreement is accounted for as a contract to perform research and development services for others, in which case, grant revenue is recognized when the related research and development expenses are incurred. In applying the provisions of Topic 606, the Company has determined that government grants are out of the scope of Topic 606 because the government entities do not meet the definition of a “customer”, as defined by Topic 606, as there is not considered to be a transfer of control of good or services to the government entities funding the grant. In the absence of applicable guidance under U.S. GAAP, our policy is to recognize grant revenue when the related costs are incurred, provided that the applicable conditions under the government contracts have been met. Only costs that are allowable under the grant award, certain government regulations and the National Institutes of Health’s supplemental policy and procedure manual may be claimed for reimbursement, and the reimbursements are subject to routine audits from governmental agencies from time to time. Costs incurred are recorded in research and development expenses on the accompanying condensed consolidated statements of operations. The Company believes the recognition of revenue as costs are incurred and amounts become realizable is analogous to the concept of transfer of control of a service over time under ASC 606.
Research and development	Research and development Research and development costs are expensed as they are incurred and include compensation for scientists, support personnel, outside contracted services, and material costs associated with product development. The Company continually
General and administrative	General and administrative General and administrative expenses consist primarily of compensation and related benefits, including stock-based compensation, for executive and corporate personnel, and professional and consulting fees.
Income taxes	Income taxes Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently due plus deferred taxes related primarily to differences between the basis of loss carryovers and depreciation differences for financial and income tax reporting. Deferred taxes represent the future tax return consequences of those differences, which will either be taxable or deductible when the assets and liabilities are recovered or settled. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which the differences are expected to be recovered or settled.
Stock-based compensation expense	Stock-based Compensation Expense The Company recognizes compensation expense related to employee option grants and restricted stock grants, if any, in accordance with ASC 718, Compensation – Stock Compensation (“ASC 718”). Forfeitures are accounted for as they occur. The Company uses the Black-Scholes option pricing model for estimating the fair value of options granted under its equity award plans, including the 2024 Inducement Plan, 2024 Incentive Plan, 2017 Option Plan, and 2017 Incentive Plan. The fair value of each restricted stock grant, if any, is determined based on the value of the common stock granted or sold. The Company has elected to treat stock-based payment awards with time-based service conditions as a single award and recognizes stock-based compensation on a straight-line basis over the requisite service period.
Basic and diluted net earnings (loss) per share attributable to common stockholders	Basic and diluted net earnings (loss) per share attributable to common stockholders Basic earnings (loss) per share (“EPS”) of common stock is computed by dividing net income (loss) available to common stockholders (numerator) by the weighted average number of shares of common stock outstanding (denominator) during the period.
Segment reporting	Segment reporting
Recently adopted accounting pronouncements	Recently adopted accounting pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. The expanded annual disclosures are effective for our year ending December 31, 2024, and the expanded interim disclosures are effective in 2025 and will be applied retrospectively to all prior periods presented. Early adoption is permitted. The Company is currently assessing the impact of the guidance on its consolidated financial statements and disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to income Tax Disclosures , under which entities must consistently categorize and provide greater disaggregation of information in the rate reconciliation. They must also further disaggregate income taxes paid. ASU 2023-09 enhances annual income tax disclosures to address investor requests for more information about the tax risks and opportunities present in an entity’s worldwide operations. The Company adopted this standard as of January 1, 2024, and it did not have a material impact on the condensed consolidated financial statements.
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted In March 2024, the FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Schedule of Cash, Cash Equivalents and Restricted Cash	A reconciliation of the Company’s cash and cash equivalents in the condensed consolidated balance sheets to cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows for all periods presented is as follows (in thousands): September 30, 2024 December 31, 2023 Cash and cash equivalents $ 3,185 $ 7,619 Restricted cash (1) 50 — Cash, cash equivalents, and restricted cash as shown in the condensed consolidated statements of cash flows $ 3,235 $ 7,619 (1)

Selected Balance Sheet Compon_2

Selected Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets was as follows (in thousands): September 30, 2024 December 31, 2023 Prepaid technology access fee $ 1,334 $ — Prepaid insurance 375 — Other prepaid expenses 372 — Other current assets 143 — Total prepaid expenses and other current assets $ 2,224 $ —
Schedule of Property and Equipment, Net	Property and equipment at September 30, 2024 and December 31, 2023 net of accumulated depreciation expense was as follows (in thousands): September 30, 2024 December 31, 2023 Computer equipment $ 31 $ 30 Equipment 853 837 Software 96 96 Total property and equipment 980 963 Less accumulated depreciation (461) (390) Total property and equipment, net $ 519 $ 573
Schedule of Intangible Assets, Net	At September 30, 2024, intangible assets, primarily consisting of acquired IPR&D with alternative use and patents, and accumulated amortization were as follows (in thousands): September 30, 2024 Intangible assets $ 576 Accumulated amortization (67) Total intangible assets, net $ 509
Schedule of Amortization of Intangible Assets	Amortization of intangible assets for periods subsequent to September 30, 2024 is as follows (in thousands): Year Ending December 31, Amortization 2024 $ 33 2025 131 2026 131 2027 131 Thereafter 83 Total $ 509
Schedule of Accrued Liabilities	At September 30, 2024 and December 31, 2023, accrued liabilities were comprised of the following (in thousands): September 30, 2024 December 31, 2023 Accrued severance $ 606 $ — Accrued interest on convertible promissory notes — 558 Accrued compensation 201 13 Other accrued expenses 352 12 Total accrued expenses $ 1,159 $ 583

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Schedule of Debt Issuance Costs and Debt Balances	The following table summarizes the debt balances net of unamortized deferred debt issuance costs by loan agreement as of September 30, 2024 (in thousands): Principal Origination Total Debt Unamortized Total Current 2022 Secured Note $ 9,692 $ 778 $ 10,470 $ (8) $ 10,462 Non-current 2023 Secured Note — 693 693 — 693 Total debt, net $ 9,692 $ 1,471 $ 11,163 $ (8) $ 11,155

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Liabilities Measured at Fair Value on Recurring Basis	The Company had the following liabilities measured at fair value on a recurring basis (in thousands): Balance at September 30, 2024 Level 1 Level 2 Level 3 Liabilities: Warrant liability $ 6,744 $ — $ — $ 6,744 Total $ 6,744 $ — $ — $ 6,744 Balance at December 31, 2023 Level 1 Level 2 Level 3 Liabilities: Convertible promissory notes $ 2,983 $ — $ — $ 2,983 Total $ 2,983 $ — $ — $ 2,983
Schedule of Convertible Promissory Note Liabilities Measured at Fair Value on Recurring Basis	The following is a reconciliation of the beginning and ending balances for the AgeX-Serina Note and the Legacy Serina Convertible Notes liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the nine months ended September 30, 2024 and 2023 (in thousands): AgeX-Serina Serina Balance as of December 31, 2023 $ 2,983 $ — Notes converted into common stock (10,000) — Change in fair value 7,017 — Balance as of September 30, 2024 $ — $ — AgeX-Serina Serina Balance as of December 31, 2022 $ — $ 1,617 Convertible debt issuance 10,000 100 Inception adjustment (2,240) — Notes converted to Series A-5 pref. stock — (963) Notes converted to warrants — (175) Change in fair value (3,898) (579) Balance as of September 30, 2023 $ 3,862 $ —
Schedule of Warrant Liability Measured at Fair Value on Recurring Basis	The following is a reconciliation of the beginning and ending balances of warrant liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the nine months ended September 30, 2024 and 2023 (in thousands): Merger Assumed Balance as of December 31, 2023 $ — $ — Fair value at inception 18,501 — Exercise (1,372) — Change in fair value (10,385) — Balance as of September 30, 2024 $ 6,744 $ — Balance as of December 31, 2022 $ — $ 1,077 Change in fair value — (1,059) Balance as of September 30, 2023 $ — $ 18
Schedule of Estimates the Fair Value of Warrants	The Company estimates the fair value of warrants using the Black-Scholes-Merton option pricing model with the following assumptions at the reporting date: September 30, 2024 September 30, 2023 Expected volatility 99.15% -123.57% 97.0% - 99% Expected term (in years) 0.8 – 3.49 0.30 - 0.8 Risk-free interest rate 3.58% - 4.45% 5.09% - 5.55% Expected dividend yield 0.00 % 0.00 %

Stockholders_ Equity_(Deficit)

Stockholders’ Equity/(Deficit) (Tables)	9 Months Ended
	Sep. 30, 2024
Class of Warrant or Right [Line Items]
Schedule of Redeemable Convertible Preferred Stock	The table below presents Legacy Serina redeemable convertible preferred stock information adjusted for the 0.97682654 Exchange Ratio as of December 31, 2023 (in thousands other than per share price). Preference Order Designation Shares Shares Issue Price Carrying Value Liquidation Preference #1 Series A Preferred Stock 391 391 $ 5.12 $ 2,000 $ 2,002 #2 Series A-1 Preferred Stock 293 293 6.82 $ 1,998 $ 1,998 #3 Series A-2 Preferred Stock 1,091 1,091 10.17 $ 11,085 $ 11,095 #4 Series A-3 Preferred Stock 487 487 12.80 $ 6,240 $ 6,234 #5 Series A-4 Preferred Stock 702 702 13.31 $ 9,347 $ 9,344 #6 Series A-5 Preferred Stock 1,954 474 13.31 $ 5,734 $ 6,309 4,918 3,438 $ 36,404 $ 36,982
Merger Warrants
Class of Warrant or Right [Line Items]
Schedule of Warrant Activity	Details of Merger Warrant activity for the nine months ended September 30, 2024 are as follows: Post-Merger Warrants Incentive Warrants Balance at December 31, 2023 - - Warrants issued 1,500 378 Warrants exercised (378) - Warrants outstanding at September 30, 2024 1,122 378

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Stock Option Activity	A summary of Serina stock option activity under all plans and related information are as follows (in thousands, except weighted average exercise price): Number Weighted- Balance at December 31, 2023 1,716 $0.06 Assumption of options in connection with the Merger 12 $24.04 Granted 1,653 $9.16 Exercised (164) $0.06 Cancelled/Forfeited (1) $26.48 Balance at September 30, 2024 3,216 $4.82 Options exercisable at September 30, 2024 1,598 $0.49
Schedule of Stock Based Compensation Expense	Stock-based compensation expense has been allocated to operating expenses as follows (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 210 $ — $ 343 $ — General and administrative 886 — 1,264 25 Total stock-based compensation expense $ 1,096 $ — $ 1,607 $ 25
Schedule of Weighted Average Assumptions to Calculate Fair Value of Stock Options	The fair value of each option award is estimated on the date of grant using a Black-Scholes option pricing model applying the weighted-average assumptions including the market price of the underlying common stock, expected option life, risk-free interest rates, volatility, and dividend yield. The assumptions that were used to calculate the grant date fair value of employee and non-employee stock option grants for the three and nine months ended September 30, 2024 were as follows: Three Months Ended Nine Months Ended 2024 (1) 2023 (2) 2024 (1) 2023 (2) Expected life (in years) 5.9 - 6.1 — 5.0 - 6.1 — Volatility 117.91% - 118.33% — 113.08% - 118.33% — Risk-free interest rates 3.54% - 4.14% — 3.54% - 4.65% — Dividend yield — — — — (1) Relates to stock options granted under the Serina 2024 Equity Incentive Plan during the period. (2) There were no stock options granted during the period.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Cash Flow Information Related to Leases	Supplemental cash flow information related to leases is as follows (in thousands): Nine Months Ended 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 166 $ 132 Operating cash flows from finance leases $ 2 $ 4 Financing cash flows from finance leases $ 34 $ 35 Right-of-use assets obtained in exchange for lease obligations Operating leases $ — $ 672 Finance leases $ — $ —
Schedule of Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows (in thousands other than weighted average remaining lease term and discount rates): September 30, 2024 December 31, 2023 Operating lease Right-of-use assets $ 862 $ 862 Accumulated Amortization (353) (196) Right-of-use asset, net $ 509 $ 666 Right-of-use lease liability, current $ 197 $ 214 Right-of-use lease liability, noncurrent 312 461 Total operating lease liabilities $ 509 $ 675 Finance leases Right-of-use assets $ 163 $ 163 Accumulated Amortization (71) (53) Right-of-use asset, net $ 92 $ 110 Right-of-use lease liability, current $ 1 $ 36 Right-of-use lease liability, noncurrent — 1 Total finance lease liabilities $ 1 $ 37 Weighted average remaining lease term Operating lease 2.78 years 3.32 years Finance leases 0.42 years 0.64 years Weighted average discount rate Operating lease 6.67 % 6.67 % Finance leases 6.67 % 11.9 %
Schedule of Annual Undiscounted Cash Flows of The Lease Liabilities	The following is a maturity analysis of the annual undiscounted cash flows of the operating lease liabilities as of September 30, 2024 (in thousands): Operating Leases Three months ending December 31, 2024 $ 56 Year ending December 31, 2025 217 Year ending December 31, 2026 159 Year ending December 31, 2027 117 Thereafter 10 Total undiscounted lease payments 559 Less: imputed interest (50) Total lease obligations 509 Less: current portion (197) Long-term lease obligations $ 312

Net Earnings (Loss) Per Commo_2

Net Earnings (Loss) Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Earnings (Loss) Per Common Share Attributable to Common Shareholders	Net earnings (loss) per common share is calculated in accordance with ASC 260, Earnings Per Share . Basic and diluted net earnings (loss) per common share attributable to common stockholders is calculated for the periods presented (in thousands) as follows. Three Months Ended Nine Months Ended 2024 2023 2024 2023 Basic net earnings (loss) per common share allocable to common stockholders NUMERATOR Net income (loss) 1,383 1,752 (8,455) 4,218 Less: net loss attributable to noncontrolling interest 27 — 54 — Net earnings (loss) attributable to Serina 1,410 1,752 (8,401) 4,218 DENOMINATOR Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share 8,851 2,190 6,774 2,176 Basic net earnings (loss) per common share allocable to common stockholders $ 0.16 $ 0.80 $ (1.24) $ 1.94 Diluted net earnings (loss) per common share allocable to common stockholders NUMERATOR Net earnings (loss) attributable to Serina 1,410 1,752 (8,401) 4,218 Add back: interest on convertible promissory notes — 6 — 83 Net earnings (loss) allocable to common stockholders 1,410 1,758 (8,401) 4,301 DENOMINATOR Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share 8,851 2,190 6,774 2,176 Add: dilutive effect of stock options 1,900 1,840 — 1,820 Add: dilutive effect of warrants — — — — Add: dilutive effect of common stock issued for convertible promissory notes — 115 — 113 Add: dilutive effect of redeemable convertible preferred stock — 3,439 — 3,439 Weighted-average shares of common stock outstanding used to calculate diluted net earnings (loss) per common share 10,751 7,584 6,774 7,548 Diluted net earnings (loss) per common share attributable to common stockholders 0.13 0.23 (1.24) 0.57
Schedule of Diluted Net Earnings (loss) Per Common Share	The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted net earnings (loss) per common share because to do so would be anti-dilutive: Three and Nine months ended September 30, 2024 Redeemable convertible preferred stock — — Convertible promissory notes — — Stock options 837 3,216 Warrants 3,226 3,226 Total anti-dilutive securities 4,063 6,442

Organization, Business Overvi_2

Organization, Business Overview and Liquidity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Conversion of stock, shares converted (in shares)							0.97682654
Number of shares acquisitions							5,913,277
Conversion of stock, shares issued (in shares)							0.97682654
Net income (loss)	$ 1,383	$ 5,177	$ (15,015)	$ 1,752	$ 808	$ 1,658	$ (8,455)	$ 4,218
Net cash used in operating activities							(12,548)	$ (2,597)
Cash and cash equivalents	3,185						3,185		$ 7,619
Expected proceeds from business merger warrant exercises	$ 10,000						$ 10,000

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) numberOfOperatingSegments	Mar. 26, 2024	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Cash, FDIC insured amount	$ 0.9		$ 0
Cash, SIPC insured amount	$ 1.3		$ 7.3
Finite-lived intangible asset, useful life (in years)	10 years
Operating segments | numberOfOperatingSegments	1
Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life ( in years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life ( in years)	10 years
Serina Therapeutics Inc
Property, Plant and Equipment [Line Items]
Equity method investment, ownership percentage	100%
Univer Xome
Property, Plant and Equipment [Line Items]
Equity method investment, ownership percentage		94.80%
Reverse Bioengineering Inc
Property, Plant and Equipment [Line Items]
Equity method investment, ownership percentage		100%
NeuroAirmid Therapeutics Inc
Property, Plant and Equipment [Line Items]
Equity method investment, ownership percentage		47.50%

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 3,185	$ 7,619
Restricted cash	50	0
Cash, cash equivalents, and restricted cash as shown in the condensed consolidated statements of cash flows	$ 3,235	$ 7,619	$ 7,581	$ 532

Selected Balance Sheet Compon_3

Selected Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid technology access fee	$ 1,334	$ 0
Prepaid insurance	375	0
Other prepaid expenses	372	0
Other current assets	143	0
Total prepaid expenses and other current assets	$ 2,224	$ 0

Selected Balance Sheet Compon_4

Selected Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 980	$ 963
Less accumulated depreciation	(461)	(390)
Total property and equipment, net	519	573
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	31	30
Equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	853	837
Software
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 96	$ 96

Selected Balance Sheet Compon_5

Selected Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Intangible assets	$ 576
Accumulated amortization	(67)
Total intangible assets, net	$ 509	$ 0

Selected Balance Sheet Compon_6

Selected Balance Sheet Components - Schedule of Amortization of Intangible Assets (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2024	$ 33
2025	131
2026	131
2027	131
Thereafter	83
Total	$ 509

Selected Balance Sheet Compon_7

Selected Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued severance	$ 606	$ 0
Accrued interest on convertible promissory notes	0	558
Accrued compensation	201	13
Other accrued expenses	352	12
Total accrued expenses	$ 1,159	$ 583

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ / shares in Units, $ in Thousands

1 Months Ended

9 Months Ended

12 Months Ended

May 08, 2024 USD ($)

Mar. 26, 2024 USD ($)

Mar. 14, 2024

Nov. 09, 2023 USD ($)

Jul. 31, 2023 USD ($)

May 09, 2023 USD ($)

Mar. 13, 2023 USD ($)

Feb. 09, 2023 USD ($)

Feb. 14, 2022 USD ($)

Jul. 31, 2023 USD ($)

Sep. 30, 2024 USD ($) $ / shares shares

Dec. 31, 2023 USD ($) $ / shares shares

Dec. 21, 2023 shares

Line of credit

$ 9,692

Warrant issued (in shares) | shares

53,980

Stock split conversion ratio

0.02843332

2022 Warrants | Minimum

Warrant, exercise price, increase (in dollars per share) | $ / shares

$ 20.75

2022 Warrants | Maximum

Warrant, exercise price, increase (in dollars per share) | $ / shares

$ 30.94

Secured Convertible Promissory Note | Secured Debt

Line of credit facility, current borrowing capacity

$ 16,700

$ 16,700

Debt instrument, decrease, forgiveness

18,000

Loan processing fee

1,300

Juvenescence Limited

Gain (loss) on extinguishment of debt

$ 36,000

Juvenescence Limited | Secured Convertible Promissory Note

Line of credit facility, current borrowing capacity

$ 10,000

Proceeds from issuance of long-term debt

10,000

Juvenescence

Warrant issued (in shares) | shares

294,482

467,657

Juvenescence | Secured Convertible Promissory Note

Debt instrument, face amount

$ 10,000

Merger Agreement

Other liabilities

$ 500

Merger Agreement | 2022 Warrants

Warrant, exercise price, increase (in dollars per share) | $ / shares

$ 25.01

Warrant, exercise price, decrease | $ / shares

$ 20.75

Merger Agreement | Juvenescence

Warrant issued (in shares) | shares

129,593

Stock issued during period shares issued cancelled (in shares) | shares

164,889

2022 Secured Convertible Promissory Note and Security Agreement

Line of credit

$ 13,200

Line of credit facility, expiration period

12 months

Line of credit, current

$ 8,200

Line of credit facility, current borrowing capacity

$ 7,200

2022 Secured Convertible Promissory Note and Security Agreement | Secured Debt

Line of credit facility, current borrowing capacity

$ 26,500

$ 7,500

2022 Secured Convertible Promissory Note and Security Agreement | Secured Convertible Promissory Note

Line of credit facility, increase (decrease), net

$ 4,000

$ 2,000

2022 Secured Note

Line of credit facility, increase (decrease), net

$ 500

$ 2,400

$ 4,400

Loan origination fee

4%

2022 Secured Note | Secured Debt

Line of credit

$ 6,300

Registration Rights Agreements

Commitment fee percentage

7%

Related Party Transactions - Sc

Related Party Transactions - Schedule of Debt Issuance Costs and Debt Balances (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Short-Term Debt [Line Items]
Principal	$ 9,692
Origination Fee	1,471
Total Debt	11,163
Unamortized Debt Issuance Costs	(8)
Long-Term Debt, Total	11,155
2022 Secured Note
Short-Term Debt [Line Items]
Principal	9,692
Origination Fee	778
Total Debt	10,470
Unamortized Debt Issuance Costs	(8)
Long-Term Debt, Total	10,462
2023 Secured Note
Short-Term Debt [Line Items]
Principal	0
Origination Fee	693
Total Debt	693
Unamortized Debt Issuance Costs	0
Long-Term Debt, Total	$ 693

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	$ 6,744
Convertible promissory notes		$ 2,983
Total	6,744	2,983
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	0
Convertible promissory notes		0
Total	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	0
Convertible promissory notes		0
Total	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	6,744
Convertible promissory notes		2,983
Total	$ 6,744	$ 2,983

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended
	Mar. 26, 2024	Mar. 15, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Feb. 28, 2023	Jun. 06, 2024	Mar. 19, 2024	Dec. 31, 2023	Dec. 21, 2023	Jul. 26, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Change in fair value of convertible promissory notes			$ 0	$ (2,614,000)	$ 7,017,000	$ (4,477,000)
Change in fair value of warrants			(6,669,000)	(596,000)	$ (10,385,000)	(1,059,000)
Warrants exercisable shares (in shares)										53,980
Conversion of stock, shares issued (in shares)					0.97682654
Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Change in fair value			$ 6,700,000	600,000	$ 10,400,000	1,100,000
Conversion of stock, shares issued (in shares)	0.97682654
Post-Merger Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants exercisable shares (in shares)			1,122,419		1,122,419			377,865	1,133,593
Class of warrant or right, exercise price of warrants or rights (in usd per share)								$ 13.20	$ 18
Warrants and rights outstanding								$ 5,000,000
Class of warrant or right, outstanding (in shares)			1,122,419		1,122,419					0
Incentive Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants exercisable shares (in shares)			377,865		377,865			377,865
Class of warrant or right, exercise price of warrants or rights (in usd per share)			$ 18		$ 18			$ 18
Warrants and rights outstanding, maturity date			Mar. 26, 2028		Mar. 26, 2028
Class of warrant or right, outstanding (in shares)			378,000		378,000					0
Assumed Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Change in fair value of warrants					$ 0	(1,059,000)
Class of warrant or right, exercise price of warrants or rights (in usd per share)			$ 20.47		$ 20.47
Warrants and rights outstanding			$ 0	18,000	$ 0	18,000				$ 0			$ 1,077,000
Convertible Promissory Note
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Principal amount		$ 10,000,000
Fair value, option, changes in fair value, gain (loss)		7,800,000
Change in fair value of convertible promissory notes			$ 0	(2,200,000)		(3,900,000)
Issued Interest Bearing Convertible Promissory Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Principal amount							$ 1,500,000
Debt instrument, interest rate, stated percentage							6%
Discount percentage							0.20
Valuation cap							$ 100,000,000
Class of warrant or right, exercise price of warrants or rights (in usd per share)							$ 20.47
Issued Interest Bearing Convertible Promissory Notes | Series A-5 Preferred Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conversion price (in usd per share)							$ 13.31
Issued Interest Bearing Convertible Promissory Notes | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Proceeds from issuance of preferred stock and preference stock							$ 15,000,000
Capitalization factor							$ 100,000,000
Convertible Notes | Series A-5 Preferred Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)												115,171
Change in fair value				$ (400,000)		$ (600,000)
Juvenescence
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants exercisable shares (in shares)										294,482	467,657
Juvenescence | Convertible Note Purchase Agreement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Principal amount		$ 10,000,000
Debt instrument, interest rate, stated percentage		7%
Juvenescence Limited | Post-Merger Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Class of warrant or right, outstanding (in shares)			755,728		755,728
Juvenescence Limited | Incentive Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Class of warrant or right, outstanding (in shares)			377,865		377,865

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Convertible Promissory Note Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
AgeX-Serina Note
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,983	$ 0
Notes converted into common stock	(10,000)
Change in fair value	7,017	(3,898)
Convertible debt issuance		10,000
Inception adjustment		(2,240)
Ending balance	0	3,862
AgeX-Serina Note | Series A-5 Preferred Stock
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Notes converted into common stock	0
AgeX-Serina Note | Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Notes converted into common stock	0
Serina Convertible Notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	1,617
Notes converted into common stock	0
Change in fair value	0	(579)
Convertible debt issuance		100
Inception adjustment		0
Ending balance	0	$ 0
Serina Convertible Notes | Series A-5 Preferred Stock
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Notes converted into common stock	(963)
Serina Convertible Notes | Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Notes converted into common stock	$ (175)

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Warrant Liability Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Class of Warrant or Right Outstanding [Roll Forward]
Change in fair value of warrants	$ (6,669)	$ (596)	$ (10,385)	$ (1,059)
Merger Warrants
Class of Warrant or Right Outstanding [Roll Forward]
Beginning balance			0	0	$ 0
Fair value at inception			18,501
Exercise			(1,372)
Change in fair value of warrants			(10,385)	0
Ending balance	6,744	0	6,744	0	0
Assumed Warrants
Class of Warrant or Right Outstanding [Roll Forward]
Beginning balance			0	1,077	1,077
Fair value at inception			0
Exercise			0
Change in fair value of warrants			0	(1,059)
Ending balance	$ 0	$ 18	$ 0	$ 18	$ 0

Fair Value Measurements - Sch_4

Fair Value Measurements - Schedule of Estimates the Fair Value of Warrants (Details)	Sep. 30, 2024	Sep. 30, 2023
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected term (in years)	9 months 18 days	3 months 18 days
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected term (in years)	3 years 5 months 26 days	9 months 18 days
Expected volatility | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding, measurement input	0.9915	0.970
Expected volatility | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding, measurement input	1.2357	0.99
Risk-free interest rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding, measurement input	0.0358	0.0509
Risk-free interest rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding, measurement input	0.0445	0.0555
Expected dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding, measurement input	0	0

Stockholders_ Equity_(Deficit_2

Stockholders’ Equity/(Deficit) - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 14, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 06, 2024	Mar. 19, 2024	Dec. 31, 2022
Class of Stock [Line Items]
Common stock, voting rights				common stock are entitled to one vote for each share
Warrant issued (in shares)						53,980
Conversion of stock, shares issued (in shares)				0.97682654
Change in fair value of warrants		$ (6,669)	$ (596)	$ (10,385)	$ (1,059)
Assumed Warrants
Class of Stock [Line Items]
Warrant issued (in shares)		473,681		473,681		115,170
Warrant outstanding (in shares)		473,681		473,681
Class of warrant or right, exercise price of warrants or rights (in usd per share)		$ 20.47		$ 20.47
Conversion of stock, shares issued (in shares)				0.97682654
Change in fair value of warrants						$ 200
Assumed Warrants | Put and Call Option
Class of Stock [Line Items]
Warrant issued (in shares)		358,511		358,511
Warrants
Class of Stock [Line Items]
Warrant issued (in shares)		129,593		129,593
Warrant outstanding (in shares)		129,593		129,593
Warrants
Class of Stock [Line Items]
Reverse stock split	1 for 35.17
Warrants | Minimum
Class of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights (in usd per share)		$ 20.75		$ 20.75
Warrants | Maximum
Class of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights (in usd per share)		$ 25.01		$ 25.01
Merger Warrants
Class of Stock [Line Items]
Other additional capital								$ 15,000
Warrants and rights outstanding		$ 6,744	$ 0	$ 6,744	0	$ 0			$ 0
Change in fair value of warrants				$ (10,385)	$ 0
Post-Merger Warrants
Class of Stock [Line Items]
Warrant issued (in shares)		1,122,419		1,122,419			377,865	1,133,593
Warrant outstanding (in shares)		1,122,419		1,122,419		0
Class of warrant or right, exercise price of warrants or rights (in usd per share)							$ 13.20	$ 18
Warrants and rights outstanding							$ 5,000
Post-Merger Warrants | Juvenescence Limited
Class of Stock [Line Items]
Warrant outstanding (in shares)		755,728		755,728
Incentive Warrants
Class of Stock [Line Items]
Warrant issued (in shares)		377,865		377,865			377,865
Warrant outstanding (in shares)		378,000		378,000		0
Class of warrant or right, exercise price of warrants or rights (in usd per share)		$ 18		$ 18			$ 18
Warrants and rights outstanding, maturity date		Mar. 26, 2028		Mar. 26, 2028
Incentive Warrants | Juvenescence Limited
Class of Stock [Line Items]
Warrant outstanding (in shares)		377,865		377,865
Redeemable convertible preferred stock
Class of Stock [Line Items]
Redeemable convertible preferred stock per share (in usd per share)						$ 0.97682654

Stockholders_ Equity_(Deficit_3

Stockholders’ Equity/(Deficit) - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, shares in Thousands	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Shares Designated (in shares)	10,000			10,000
Issue Price per Share (in usd per share)	$ 0.01			$ 0.01
Carrying Value	$ 0	$ 0	$ 0	$ 36,404,000	$ 36,404,000	$ 35,442,000	$ 35,442,000	$ 35,442,000
Liquidation Preference	$ 0			$ 36,982,000
Redeemable convertible preferred stock
Class of Stock [Line Items]
Redeemable convertible preferred stock per share (in usd per share)				$ 0.97682654
Series A Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				391
Shares Issued and Outstanding (in shares)				391
Issue Price per Share (in usd per share)				$ 5.12
Carrying Value				$ 2,000,000
Liquidation Preference				$ 2,002,000
Series A-1 Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				293
Shares Issued and Outstanding (in shares)				293
Issue Price per Share (in usd per share)				$ 6.82
Carrying Value				$ 1,998,000
Liquidation Preference				$ 1,998,000
Series A-2 Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				1,091
Shares Issued and Outstanding (in shares)				1,091
Issue Price per Share (in usd per share)				$ 10.17
Carrying Value				$ 11,085,000
Liquidation Preference				$ 11,095,000
Series A-3 Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				487
Shares Issued and Outstanding (in shares)				487
Issue Price per Share (in usd per share)				$ 12.80
Carrying Value				$ 6,240,000
Liquidation Preference				$ 6,234,000
Series A-4 Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				702
Shares Issued and Outstanding (in shares)				702
Issue Price per Share (in usd per share)				$ 13.31
Carrying Value				$ 9,347,000
Liquidation Preference				$ 9,344,000
Series A-5 Preferred Stock
Class of Stock [Line Items]
Shares Designated (in shares)				1,954
Shares Issued and Outstanding (in shares)				474
Issue Price per Share (in usd per share)				$ 13.31
Carrying Value				$ 5,734,000
Liquidation Preference				$ 6,309,000
Redeemable Convertible Preferred Stock, Pre-Merger
Class of Stock [Line Items]
Shares Designated (in shares)				4,918
Shares Issued and Outstanding (in shares)				3,438
Carrying Value				$ 36,404,000

Stockholders_ Equity_(Deficit_4

Stockholders’ Equity/(Deficit) - Schedule of Warrant Activity (Details)	9 Months Ended
	Sep. 30, 2024 shares
Post-Merger Warrants
Class of Warrant or Right [Line Items]
Beginning balance (in shares)	0
Warrants issued (in shares)	1,500,000
Warrants exercised (in shares)	(378,000)
Ending balance (in shares)	1,122,419
Incentive Warrants
Class of Warrant or Right [Line Items]
Beginning balance (in shares)	0
Warrants issued (in shares)	378,000
Warrants exercised (in shares)	0
Ending balance (in shares)	378,000

Stock-Based Awards -Narrative (

Stock-Based Awards -Narrative (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Mar. 14, 2024	Sep. 30, 2024 USD ($) $ / shares shares	Aug. 15, 2024 shares	Mar. 27, 2024 shares	Dec. 31, 2023 $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 4.82			$ 0.06
Exercised (in shares)		164,000
Conversion of stock, shares issued (in shares)		0.97682654
Stock split conversion ratio	0.02843332
2024 Inducement Equity Plan | Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares available for grant (in shares)			1,000,000
2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options granted (in shares)		1,652,792
Exercised (in shares)		0
Grants in period, weighted average grant date fair value (in usd per share) | $ / shares		$ 7.95
Cost not yet recognized, amount | $		$ 11,500
Weighted average remaining contractual term		1 year 9 months 18 days
2024 Equity Incentive Plan | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 6.66
2024 Equity Incentive Plan | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 14.87
2024 Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares available for grant (in shares)				1,725,000
Serina 2017 Stock Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares available for grant (in shares)		1,551,411
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 0.06
Exercised (in shares)		164,693
Conversion of stock, shares issued (in shares)		0.97682654
Serina 2017 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options granted (in shares)		11,359
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 0.7751
Common stock, capital shares reserved for future issuance (in share)		241,683
Stock split conversion ratio		0.02843332
Serina 2017 Equity Incentive Plan | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 13.19
Serina 2017 Equity Incentive Plan | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding, weighted average exercise price (in usd per share) | $ / shares		$ 25.96

Stock-Based Awards - Schedule o

Stock-Based Awards - Schedule of Stock Option Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2024
Number of Options Outstanding
Beginning balance (in shares)	1,716,000
Assumption of options in connection with the merger (in shares)	12,000
Granted (in shares)	1,653,000
Exercised (in shares)	(164,000)
Cancelled/Forfeited (in shares)	(1,000)
Ending balance (in shares)	3,216,000
Exercisable, number (in shares)	1,598,000
Weighted- Average Exercise Price (per share)
Beginning balance (in usd per share)	$ 0.06
Assumption of options in connection with the merger (in usd per share)	24.04
Granted (in usd per share)	9.16
Exercised (in usd per share)	0.06
Cancelled/Forfeited (in usd per share)	26.48
Ending balance (in usd per share)	4.82
Exercisable, weighted average exercise price (in usd per share)	$ 0.49

Stock-Based Awards - Schedule_2

Stock-Based Awards - Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 1,096	$ 0	$ 1,607	$ 25
Research and development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	210	0	343	0
General and administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 886	$ 0	$ 1,264	$ 25

Stock-Based Awards - Schedule_3

Stock-Based Awards - Schedule of Weighted Average Assumptions to Calculate Fair Value of Stock Options (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected life (in years)
Dividend yield	0%		0%
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected life (in years)	5 years 10 months 24 days		5 years
Volatility	117.91%		113.08%
Risk-free interest rates	3.54%		3.54%
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected life (in years)	6 years 1 month 6 days		6 years 1 month 6 days
Volatility	118.33%		118.33%
Risk-free interest rates	4.14%		4.65%

Profit Sharing Plan - Narrative

Profit Sharing Plan - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Postemployment Benefits [Abstract]
Defined contribution plan, employer discretionary contribution amount	$ 0	$ 0	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 166	$ 132
Operating cash flows from finance leases	2	4
Financing cash flows from finance leases	34	35
Right-of-use assets obtained in exchange for lease obligations
Operating leases	0	672
Finance leases	$ 0	$ 0

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Operating lease
Right-of-use assets	$ 862	$ 862
Accumulated Amortization	(353)	(196)
Right-of-use asset, net	509	666
Right-of-use lease liability, current	197	214
Right-of-use lease liability, noncurrent	312	461
Total operating lease liabilities	509	675
Finance leases
Right-of-use assets	163	163
Accumulated Amortization	(71)	(53)
Right-of-use asset, net	92	110
Right-of-use lease liability, current	1	36
Right-of-use lease liability, noncurrent	0	1
Total finance lease liabilities	$ 1	$ 37
Weighted average remaining lease term
Operating lease	2 years 9 months 10 days	3 years 3 months 25 days
Finance leases	5 months 1 day	7 months 20 days
Weighted average discount rate
Operating lease	6.67%	6.67%
Finance leases	6.67%	11.90%

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Annual Undiscounted Cash Flows of The Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Operating Leases
Three months ending December 31, 2024	$ 56
Year ending December 31, 2025	217
Year ending December 31, 2026	159
Year ending December 31, 2027	117
Thereafter	10
Total undiscounted lease payments	559
Less: imputed interest	(50)
Total operating lease liabilities	509	$ 675
Less: current portion	(197)	(214)
Operating lease liabilities, net of current portion	$ 312	$ 461

Commitments and Contingencies_4

Commitments and Contingencies - Narrative (Details) $ in Thousands	1 Months Ended
	May 31, 2024 USD ($)
Enable Arrangement
Other Commitments [Line Items]
Payments to acquire intangible assets	$ 2,000

Net Earnings (Loss) Per Commo_3

Net Earnings (Loss) Per Common Share - Schedule of Basic and Diluted Net Earnings (Loss) Per Common Share Attributable to Common Shareholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
NUMERATOR
Net income (loss)	$ 1,383	$ 5,177	$ (15,015)	$ 1,752	$ 808	$ 1,658	$ (8,455)	$ 4,218
Less: net loss attributable to noncontrolling interest	27			0			54	0
Net earnings (loss) attributable to Serina	$ 1,410			$ 1,752			$ (8,401)	$ 4,218
DENOMINATOR
Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share ( in shares)	8,851			2,190			6,774	2,176
Basic net earnings (loss) per common share allocable to common stockholders (in usd per share)	$ 0.16			$ 0.80			$ (1.24)	$ 1.94
NUMERATOR
Net earnings (loss) attributable to Serina	$ 1,410			$ 1,752			$ (8,401)	$ 4,218
Add back: interest on convertible promissory notes	0			6			0	83
Net earnings (loss) allocable to common stockholders	$ 1,410			$ 1,758			$ (8,401)	$ 4,301
DENOMINATOR
Weighted-average shares of common stock outstanding used to calculate basic net earnings (loss) per common share ( in shares)	8,851			2,190			6,774	2,176
Add: dilutive effect of stock options	1,900			1,840			0	1,820
Add: dilutive effect of warrants	0			0			0	0
Add: dilutive effect of common stock issued for convertible promissory notes	0			115			0	113
Add: dilutive effect of redeemable convertible preferred stock	0			3,439			0	3,439
Weighted-average shares of common stock outstanding used to calculate diluted net earnings (loss) per common share ( in shares)	10,751			7,584			6,774	7,548
Diluted net earnings (loss) per common share attributable to common stockholders (in usd per share)	$ 0.13			$ 0.23			$ (1.24)	$ 0.57

Net Earnings (Loss) Per Commo_4

Net Earnings (Loss) Per Common Share - Schedule of Diluted Net Earnings (loss) Per Common Share (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities ( in shares)	4,063	6,442
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities ( in shares)	0	0
Convertible promissory notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities ( in shares)	0	0
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities ( in shares)	837	3,216
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities ( in shares)	3,226	3,226