Nature of the Business and Basis of Presentation | 1. Nature of the Business and Basis of Presentation Organization Arcellx, Inc. (Arcellx or the Company) was incorporated in Delaware in December 2014 and is headquartered in Gaithersburg, Maryland. The Company is a clinical-stage biopharmaceutical company reimagining cell therapy through the development of innovative therapies for patients with cancer and other incurable diseases. On February 8, 2022, the Company closed its initial public offering (IPO) of 9,487,500 shares of its common stock, including the exercise in full by the underwriters of their option to purchase 1,237,500 additional shares of its common stock, at a public offering price of $ 15.00 per share. The Company received net proceeds of $ 127.3 million, after deducting underwriting discounts and commissions of and other offering expenses paid by the Company of approximately $ 15.0 million. The Company’s common stock began trading on the Nasdaq Global Select Market on February 4, 2022, under the ticker symbol “ACLX.” Liquidity The Company has not commercialized any of its drug candidates and planned commercial operations have not commenced. The Company expects to incur additional operating losses and negative operating cash flows for the foreseeable future as it continues development of drug candidates, including preclinical and clinical testing and regulatory approval prior to commercialization. The Company has not generated any revenue to date from product sales and does not expect to generate any revenues from product sales in the foreseeable future. Even if drug development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales. The Company expects that its cash and cash equivalents and marketable securities will be sufficient to fund its operating expenses and capital expenditure requirements into the second half of 2023. The Company has funded its operations primarily with proceeds from public and private offerings of its common and preferred stock. The Company plans to seek additional funding through public or private equity offerings, debt financings, marketing and distribution arrangements, other collaborations, strategic alliances, and licensing arrangements. The Company may not be able to obtain financing on acceptable terms, or at all, and the Company may not be able to enter into strategic alliances or other arrangements on favorable terms, or at all. The terms of any financing may adversely affect the holdings or the rights of the Company’s stockholders. If the Company is unable to obtain funding, the Company could be required to delay, reduce or eliminate research and development programs, product portfolio expansion or future commercialization efforts, which could adversely affect its business prospects. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the SEC for interim financial information. Accordingly, they do not include all of the information required by U.S. generally accepted accounting principles for complete financial statements. These condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and the accompanying notes to our consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2021, as filed with the SEC on March 24, 2022. In our management’s opinion, the accompanying condensed consolidated financial statements contain all adjustments, including normal, recurring adjustments, necessary to fairly present our financial position as of March 31, 2022 and December 31, 2021, our condensed consolidated statements of operations and comprehensive loss for the three-month period ended March 2022 and 2021, our condensed consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit) for the three-month period ended March 31, 2022 and 2021, and our statements of condensed consolidated cash flows for the three-month period ended March 31, 2022 and 2021. Interim results are not necessarily indicative of results for an entire year. Restatement of Previously Issued Financial Statements The Company has restated its previously reported unaudited condensed consolidated financial statements as of and for the three-month period ended March 31, 2022. The restatement reflects the correction of certain errors made in accounting for the Company’s research and development expenses and related accounts and other immaterial errors as of and for the three-month period ended March 31, 2022. The correction of these errors decreased the Company's net loss by $ 6.3 million. The correction of the aforementioned errors and other immaterial errors reduced the research and development expenses by $ 6.3 million, from $ 24.4 million to $ 18.1 million, during the three-month period ended March 31, 2022, as a result of correcting the expense incurred as part of the Company's arrangements with third-party contract research organizations and contract manufacturing organizations. The following table presents the effect of the restatement on the Company's unaudited condensed consolidated financial statements: (in thousands, except per share amounts) As of and Three Months Ended March 31, 2022 Previously Reported Correction of Error Restated Changes in the balance sheet: Prepaid expenses and other current assets $ 9,974 $ 3,486 $ 13,460 Total current assets 220,903 3,486 224,389 Property and equipment, net 10,127 ( 380 ) 9,747 Prepaid research and development expenses and other long-term assets 8,913 488 9,401 Total assets 243,390 3,594 246,984 Accrued liabilities 14,400 ( 2,750 ) 11,650 Operating lease liabilities, current portion 370 367 737 Total current liabilities 16,808 ( 2,383 ) 14,425 Operating lease liabilities, net of current portion 4,844 ( 367 ) 4,477 Total liabilities 21,799 ( 2,750 ) 19,049 Accumulated deficit ( 162,496 ) 6,344 ( 156,152 ) Total stockholders’ equity 221,591 6,344 227,935 Total liabilities and stockholders’ equity 243,390 3,594 246,984 Changes in the statement of operations and comprehensive loss: Research and development 24,401 ( 6,344 ) 18,057 Total operating expenses 32,435 ( 6,344 ) 26,091 Loss from operations ( 32,435 ) 6,344 ( 26,091 ) Net loss ( 32,385 ) 6,344 ( 26,041 ) Comprehensive loss ( 32,409 ) 6,344 ( 26,065 ) Net loss per share attributable to common stockholders—basic and diluted ( 1.56 ) 0.31 ( 1.25 ) Changes in the statement of cash flows: Net loss ( 32,385 ) 6,344 ( 26,041 ) Depreciation and amortization 416 ( 153 ) 263 Prepaid expenses and other current and non-current assets ( 8,423 ) ( 3,441 ) ( 11,864 ) Accrued liabilities 2,563 ( 2,750 ) ( 187 ) Net cash used in operating activities ( 32,586 ) — ( 32,586 ) |