# EDGAR Filing Document

**Accession Number:** 0001326190
**File Stem:** 0001558370-25-011145
**Filing Date:** 2025-8
**Character Count:** 23646
**Document Hash:** ad3bdf44e0f80ef467f87192bff92d4c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001558370-25-011145.hdr.sgml**: 20250812

**ACCESSION NUMBER**: 0001558370-25-011145

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20250812

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250812

**DATE AS OF CHANGE**: 20250812

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Altimmune, Inc.
- **CENTRAL INDEX KEY:** 0001326190
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 202726770
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32587
- **FILM NUMBER:** 251204002

**BUSINESS ADDRESS:**
- **STREET 1:** 910 CLOPPER ROAD
- **STREET 2:** SUITE 201S
- **CITY:** GAITHERSBURG
- **STATE:** MD
- **ZIP:** 20878
- **BUSINESS PHONE:** 2406541450

**MAIL ADDRESS:**
- **STREET 1:** 910 CLOPPER ROAD
- **STREET 2:** SUITE 201S
- **CITY:** GAITHERSBURG
- **STATE:** MD
- **ZIP:** 20878

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PHARMATHENE, INC
- **DATE OF NAME CHANGE:** 20071016

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HEALTHCARE ACQUISITION CORP
- **DATE OF NAME CHANGE:** 20050505

?xml version='1.0' encoding='ASCII'?

**UNITED STATESSECURITIES AND EXCHANGE COMMISSION**

**Washington, DC 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d)of The Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): August 12, 2025**

## ALTIMMUNE, INC.
**(Exact name of registrant as specified in its charter)**

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-32587** | **20-2726770** |
| **(State or other jurisdiction**<br>**of incorporation)** | **(Commission**<br>**File Number)** | **(IRS Employer**<br>**Identification No.)** |
| **910 Clopper Road, Suite 201S**<br>**Gaithersburg, Maryland** |  | **20878** |
| **(Address of principal executive offices)** |  | **(Zip Code)** |

---

**Registrant's telephone number including area code: (240) 654-1450**

**(Former name or former address, if changed since last report)**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered |
| Common stock, par value $0.0001 per share | ALT | The NASDAQ Global Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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**Item 2.02 Results of Operations and Financial Condition**

On August 12, 2025, Altimmune, Inc. (the "Company") issued a press release announcing the Company's financial results for its second quarter ended June 30, 2025. A copy of this press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this Item 2.02 shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended. In addition, the information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this Item 2.02 shall not be incorporated by reference into any filing of the Registrant, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference into such filing.

**Item 9.01 Financial Statements and Exhibits**

(d) Exhibits

---

| | |
|:---|:---|
| **No.** | **Description** |
| 99.1 | [Press Release of Altimmune, Inc. dated August 12, 2025](alt-20250812xex99d1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| **ALTIMMUNE, INC.** | **ALTIMMUNE, INC.** |
| By: | /s/ Gregory Weaver |
|  | Name: Gregory Weaver |
|  | Title: Chief Financial Officer |

---

Dated: August 12, 2025

## Exhibit 99.1

![Graphic](alt-20250812xex99d1002.jpg)

#### Exhibit 99.1
**Altimmune Announces Second Quarter 2025 Financial Results and Business Update**

*Positive data from the IMPACT Phase 2b trial reinforces the potential for pemvidutide to be a highly differentiated MASH therapy*

*Pemvidutide is the first product candidate to achieve statistically significant MASH resolution and weight loss at 24 weeks*

*New data from the IMPACT trial demonstrates potentially class-leading improvements in corrected T1 (cT1), an important marker of liver inflammation and fibrosis*

*End-of-Phase 2 Meeting with FDA expected in Q4 2025*

*Cash, cash equivalents and short-term investments of $183.1 million as of June 30, 2025*

*Webcast to be held today, August 12, 2025, at 8:30 a.m. ET*

**GAITHERSBURG, MD – August 12, 2025** – Altimmune, Inc. (Nasdaq: ALT), a late clinical-stage biopharmaceutical company developing peptide-based therapeutics for liver and cardiometabolic diseases, today announced financial results for the second quarter ended June 30, 2025 and provided a business update.

"Pemvidutide demonstrated rapid and robust MASH effects, meaningful weight loss and impressive safety and tolerability in the recently reported results from the IMPACT Phase 2b trial," said Vipin K. Garg, Ph.D., President and Chief Executive Officer of Altimmune. "We are preparing for an End-of-Phase 2 Meeting with the FDA which will position us well for Phase 3 development. In addition, we look forward to reporting the full 48-week data in the fourth quarter and providing further updates as we continue to advance pemvidutide."

Dr. Scott Harris, Chief Medical Officer of Altimmune, commented, "The improvements in cT1 observed in the IMPACT trial were potentially class-leading among MASH clinical trials to-date. Reductions in cT1 are correlated with MASH resolution and fibrosis improvement. These new data along with the previously reported results from non-invasive tests of fibrosis, further strengthen the potential therapeutic value of pemvidutide."

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![Graphic](alt-20250812xex99d1002.jpg)

**Recent Highlights and Anticipated Milestones**

**Metabolic Dysfunction-Associated Steatohepatitis (MASH)**

&nbsp;&nbsp;&nbsp;&nbsp;● *Reported positive 24-week top-line data from the IMPACT Phase 2b trial* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Statistically significant MASH resolution without worsening of fibrosis was observed in up to 59.1% of patients receiving pemvidutide

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Fibrosis improvement without worsening of MASH was observed in up to 34.5% of pemvidutide-treated patients

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Statistically significant improvements were observed across multiple objective measures of efficacy, including supplemental AI-based analyses and non-invasive tests (NITs) of liver fibrosis, Enhanced Liver Fibrosis (ELF) score and Vibration-Controlled Transient Elastography (VCTE)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Statistically significant weight loss of up to 6.2% at 24 weeks with a trajectory of continuing weight loss

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Potential for best-in-class tolerability without dose titration

◾ Fewer adverse event-related discontinuations with pemvidutide vs placebo

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| | |
|:---|:---|
| ◾ | Less than 1% treatment discontinuations due to adverse events in pemvidutide-treated patients |

---

&nbsp;&nbsp;&nbsp;&nbsp;● *New data on corrected T1 (cT1) imaging demonstrates potentially class-leading improvements in pemvidutide-treated patients* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o cT1 is a highly reproducible MRI-based imaging method that measures the presence of liver inflammation and fibrosis. Decreases in cT1 relaxation time of 80 milliseconds (ms) or greater have been correlated with changes in liver inflammation and fibrosis in clinical studies.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o In an analysis of imaging data from the IMPACT trial, mean decreases from baseline in cT1 relaxation time were 145.0 ms and 147.9 ms in the pemvidutide 1.2 mg and 1.8 mg groups, respectively, compared with a decrease of 27.5 ms in placebo (p < 0.001 for both)

&nbsp;&nbsp;&nbsp;&nbsp;● *The IMPACT trial is ongoing with data on weight loss, NITs and safety at 48 weeks of treatment expected in the fourth quarter of 2025* 

&nbsp;&nbsp;&nbsp;&nbsp;● *End-of-Phase 2 Meeting with FDA targeted for fourth quarter of 2025* 

**Alcohol Use Disorder (AUD)**

&nbsp;&nbsp;&nbsp;&nbsp;● *Announced in May 2025 the initiation of RECLAIM, a Phase 2 trial evaluating the safety and efficacy of pemvidutide in AUD* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o RECLAIM is a randomized, placebo-controlled trial expected to enroll approximately 100 subjects, randomized 1:1, to receive either 2.4 mg pemvidutide or placebo weekly for 24 weeks

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The primary endpoint of the trial is the change from baseline in the average number of heavy drinking days per week at 24 weeks

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Key secondary endpoints include the proportion of subjects achieving a 2-level reduction in World Health Organization (WHO) risk drinking level and absolute change from baseline in average levels of phosphatidylethanol (PEth) a serum biomarker of alcohol intake

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![Graphic](alt-20250812xex99d1002.jpg)

**Alcohol-Associated Liver Disease (ALD)**

&nbsp;&nbsp;&nbsp;&nbsp;● *Announced in July 2025 the initiation of RESTORE, a Phase 2 trial evaluating the safety and efficacy of pemvidutide in ALD* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o RESTORE is a randomized, placebo-controlled trial expected to enroll approximately 100 subjects, randomized 1:1 to receive either 2.4 mg pemvidutide or placebo weekly for 48 weeks

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The primary endpoint of the trial is the change from baseline in liver stiffness measurement (LSM), as measured by VCTE, at week 24

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Key secondary endpoints include the change from baseline in LSM at week 48, changes in ELF score at weeks 24 and 48, and changes in alcohol consumption and body weight at both 24 and 48 weeks

**Corporate Update**

&nbsp;&nbsp;&nbsp;&nbsp;● *Jerry Durso appointed by Altimmune* *Board of Directors to succeed Mitchel Sayare, Ph.D. as Chairman* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Appointment is part of the Board's ongoing succession planning. It recognizes Mr. Durso's extensive commercial and corporate development expertise and aligns with Altimmune's planned advancement into Phase 3 development of pemvidutide in MASH.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Dr. Sayare to continue to serve on the Board as an Independent Director

**Financial Results for the Three Months Ended June 30, 2025**

&nbsp;&nbsp;&nbsp;&nbsp;● Altimmune reported cash, cash equivalents and short-term investments totaling $183.1 million as of June 30, 2025, a 39% increase as compared to $131.9 million as of December 31, 2024

&nbsp;&nbsp;&nbsp;&nbsp;● Research and development expenses were $17.2 million for the three months ended June 30, 2025, compared to $21.2 million in the same period in 2024, the decrease resulting from timing of clinical trial costs. The expenses for the quarter ended June 30, 2025, included $11.2 million in direct costs related to pemvidutide development activities

&nbsp;&nbsp;&nbsp;&nbsp;● General and administrative expenses were consistent period-over-period at $5.7 million and $5.6 million for the three months ended June 30, 2025 and 2024, respectively

&nbsp;&nbsp;&nbsp;&nbsp;● Interest income was $1.1 million for the three months ended June 30, 2025

&nbsp;&nbsp;&nbsp;&nbsp;● Net loss for the three months ended June 30, 2025, was $22.1 million, or $0.27 net loss per share, compared to a net loss of $24.6 million, or $0.35 net loss per share, in the same period in 2024

#### Conference Call Information:

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| | |
|:---|:---|
| Date: | August 12, 2025 |
| Time: | 8:30 a.m. Eastern Time |
| Webcast: | To listen, the conference call will be webcast live on Altimmune's Investor Relations website at <u>https://ir.altimmune.com/investors</u>. |
| Dial-in: | To participate or dial-in, register <u>here</u> to receive the dial-in numbers and unique PIN to access the call. |

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Following the conclusion of the call, the webcast will be available for replay on the Investor Relations (IR) page of the Company's website at <u>www.altimmune.com</u>. The Company has used, and intends to continue

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![Graphic](alt-20250812xex99d1002.jpg)

to use, the IR portion of its website as a means of disclosing material non-public information and for complying with disclosure obligations under Regulation FD.

**About Pemvidutide**

Pemvidutide is a novel, investigational, peptide-based 1:1 GLP-1/glucagon dual receptor agonist in development for the treatment of Metabolic Dysfunction-Associated Steatohepatitis (MASH), Alcohol Use Disorder (AUD), Alcohol-Associated Liver Disease (ALD) and obesity. Activation of the GLP-1 and glucagon receptors is believed to mimic the complementary effects of diet and exercise on weight loss, with GLP-1 suppressing appetite and glucagon increasing energy expenditure. Glucagon is also recognized as having direct effects on hepatic fat metabolism, which is believed to lead to rapid reductions in levels of liver fat and serum lipids. In the ongoing IMPACT Phase 2b trial, at Week 24, once-weekly pemvidutide demonstrated statistically significant MASH resolution without worsening of fibrosis, positive trends in liver fibrosis stage improvement without worsening of MASH, statistically significant reductions in non-invasive tests of fibrosis, weight loss, and liver fat content, and improvements in blood pressure. In a post-hoc AI-based analysis of the biopsies from the IMPACT trial, pemvidutide achieved a statistically significant reduction in liver fibrosis. In earlier trials, pemvidutide also demonstrated class-leading lean mass preservation and robust reductions in triglycerides and LDL cholesterol. Pemvidutide was well tolerated in the IMPACT trial, demonstrating potentially best-in-class tolerability among drugs in development for MASH with very low rates of discontinuation due to adverse events. The U.S. FDA granted Fast Track designation to pemvidutide for the treatment of MASH. The ongoing IMPACT Phase 2b MASH trial 48-week readout is expected in Q4 2025. In addition, RECLAIM, a Phase 2 trial in AUD and RESTORE, a Phase 2 trial in ALD, were initiated in May 2025 and July 2025, respectively.

**About Altimmune**

Altimmune is a late clinical-stage biopharmaceutical company focused on developing novel peptide-based therapeutics for liver and cardiometabolic diseases. The Company's lead program is pemvidutide, a GLP-1/glucagon dual receptor agonist for the treatment of MASH, Alcohol Use Disorder (AUD), Alcohol-Associated Liver Disease (ALD) and obesity. For more information, please visit <u>www.altimmune.com</u>.

**Follow @Altimmune, Inc. on LinkedIn<br>Follow @AltimmuneInc on X**

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![Graphic](alt-20250812xex99d1002.jpg)

**Forward-Looking Statement**

Any statements made in this press release related to the development or commercialization of pemvidutide, an investigational product candidate, and other business and financial matters including without limitation, clinical trial study design, status, correspondence, results and data, including the ongoing RECLAIM, RESTORE and IMPACT Trials, the timing of key milestones for the Company's clinical assets, future plans or expectations for pemvidutide for the treatment of MASH, AUD, ALD and obesity, and the prospects for receiving regulatory approval or commercializing or selling any product or drug candidates, and the impact of the changes to our leadership and governance structure, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, when or if used in this press release, the words "may," "could," "should," "anticipate," "believe," "estimate," "expect," "intend," "plan," "predict" and similar expressions and their variants, as they relate to Altimmune, Inc. may identify forward-looking statements. The Company cautions that these forward-looking statements are subject to numerous assumptions, risks, and uncertainties, which change over time. Important factors that may cause actual results to differ materially from the results discussed in the forward-looking statements or historical experience include risks and uncertainties, including risks relating to: delays in regulatory review, manufacturing and supply chain interruptions, access to clinical sites, enrollment, adverse effects on healthcare systems and disruption of the global economy; the reliability of the results of studies relating to human safety and possible adverse effects resulting from the administration of the Company's product candidates; the Company's ability to manufacture clinical trial materials on the timelines anticipated; and the success of future product advancements, including the success of future clinical trials. Further information on the factors and risks that could affect the Company's business, financial conditions and results of operations are contained in the Company's filings with the U.S. Securities and Exchange Commission, including under the heading "Risk Factors" in the Company's most recent annual report on Form 10-K, quarterly report on Form 10-Q and the Company's other filings with the SEC, which are available at <u>www.sec.gov</u>.

#### Company Contact:

---

| |
|:---|
| Gregory Weaver |
| Chief Financial Officer  |
| Phone: 240-654-1450 |
| <u>ir@altimmune.com</u> |

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#### Investor Contact:

---

| |
|:---|
| Lee Roth<br>Burns McClellan |
| Phone: 646-382-3403 |
| <u>lroth@burnsmc.com</u> |

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#### Media Contact:

---

| |
|:---|
| Jake Robison |
| Inizio Evoke Comms |
| Phone: 619-849-5383 |
| <u>jake.robison@inizioevoke.com</u> |

---

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![Graphic](alt-20250812xex99d1002.jpg)

#### ALTIMMUNE, INC.

#### CONSOLIDATED BALANCE SHEETS
**(In thousands, except share and per-share amounts)**

---

| | | |
|:---|:---|:---|
|  | **June 30,** <br>**2025** | **December 31,** <br>**2024** |
|  | **(Unaudited)** |  |
| **ASSETS** |  |  |
| Current assets: |  |  |
| &nbsp;&nbsp;Cash and cash equivalents | $183105 | $36926 |
| &nbsp;&nbsp;Restricted cash | 42 | 42 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total cash, cash equivalents and restricted cash | 183147 | 36968 |
| &nbsp;&nbsp;Short-term investments |  | 94965 |
| &nbsp;&nbsp;Accounts and other receivables | 321 | 544 |
| &nbsp;&nbsp;Income tax and R&D incentive receivables  | 557 | 2573 |
| &nbsp;&nbsp;Prepaid expenses and other current assets | 4397 | 2204 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total current assets | 188422 | 137254 |
| Property and equipment, net | 364 | 413 |
| Other assets | 1564 | 1639 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total assets | $190350 | $139306 |
| **LIABILITIES AND STOCKHOLDERS' EQUITY** |  |  |
| Current liabilities: |  |  |
| &nbsp;&nbsp;Accounts payable | $851 | $211 |
| &nbsp;&nbsp;Accrued expenses and other current liabilities | 8369 | 10257 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total current liabilities | 9220 | 10468 |
| Term loan, noncurrent | 14332 |  |
| Other noncurrent liabilities | 5431 | 5330 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total liabilities | 28983 | 15798 |
| &nbsp;&nbsp;Commitments and contingencies |  |  |
| Stockholders' equity: |  |  |
| &nbsp;&nbsp;Stockholders' equity: | 9 | 7 |
| &nbsp;&nbsp;Additional paid-in capital | 769508 | 689864 |
| &nbsp;&nbsp;Accumulated deficit | (603111) | (561390) |
| &nbsp;&nbsp;Accumulated other comprehensive loss, net | (5039) | (4973) |
| &nbsp;&nbsp;&nbsp;&nbsp;Total stockholders' equity | 161367 | 123508 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total liabilities and stockholders' equity | $190350 | $139306 |

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![Graphic](alt-20250812xex99d1002.jpg)

#### ALTIMMUNE, INC.

#### CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
**(Unaudited)**

**(In thousands, except share and per-share amounts)**

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| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  | **Six Months Ended**  | **Six Months Ended**  |
|  | **June 30,**  | **June 30,**  | **June 30,**  | **June 30,**  |
|  | **2025** | **2024** | **2025** | **2024** |
| Revenues | $5 | $5 | $10 | $10 |
| Operating expenses: |  |  |  |  |
| &nbsp;&nbsp;Research and development | 17236 | 21155 | 33063 | 42642 |
| &nbsp;&nbsp;General and administrative | 5691 | 5595 | 11684 | 10907 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 22927 | 26750 | 44747 | 53549 |
| Loss from operations | (22922) | (26745) | (44737) | (53539) |
| Other income (expense): |  |  |  |  |
| &nbsp;&nbsp;Interest expense | (264) | (1) | (265) | (2) |
| &nbsp;&nbsp;Interest income | 1132 | 2182 | 2677 | 4595 |
| &nbsp;&nbsp;Other income (expense), net | (92) | (76) | (77) | (88) |
| &nbsp;&nbsp;&nbsp;&nbsp;Total other income (expense), net | 776 | 2105 | 2335 | 4505 |
| Net loss before income taxes | (22146) | (24640) | (42402) | (49034) |
| Income tax expense (benefit) |  |  | (681) |  |
| Net loss | (22146) | (24640) | (41721) | (49034) |
| Other comprehensive income — unrealized loss on short-term investments | (36) | (31) | (66) | (188) |
| Comprehensive loss | $(22182) | $(24671) | $(41787) | $(49222) |
| Net loss per share, basic and diluted | $(0.27) | $(0.35) | $(0.53) | $(0.69) |
| Weighted-average common shares outstanding, basic and diluted | 81477548 | 70924371 | 78529028 | 70863042 |

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