Formation and Business of the Company	12 Months Ended
Formation and Business of the Company	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Formation and Business of the Company	Formation and Business of the Company The Company Pulmonx Corporation (the “Company”) was incorporated in the state of California in December 1995 as Pulmonx and reincorporated in the state of Delaware in December 2013. The Company is a commercial-stage medical technology company that provides a minimally invasive treatment for patients with severe emphysema, a form of chronic obstructive pulmonary disease (“COPD”). The Company’s solution, which is comprised of the Zephyr Endobronchial Valve (“Zephyr Valve”), the Chartis Pulmonary Assessment System (“Chartis System”) and the StratX Lung Analysis Platform (“StratX Platform”), is designed to treat a broad pool of patients for whom medical management has reached its limits and either do not want or are ineligible for surgical approaches. The Company has subsidiaries in Germany, Switzerland, Australia, the United Kingdom, the Netherlands, Italy, France and Hong Kong. Initial Public Offering On September 30, 2020, the Company’s registration statement on Form S-1 (File No. 333-248635) relating to its initial public offering (“IPO”) of common stock became effective. The IPO closed on October 5, 2020 at which time the Company issued 11,500,000 shares of its common stock at a price of $19.00 per share, which included the issuance of shares in connection with the exercise by the underwriters of their option to purchase up to 1,500,000 additional shares. The Company received an aggregate of $218.5 million gross proceeds, before underwriting discounts, commissions and offering costs, and approximately $201.4 million in net proceeds after deducting underwriting discounts and commissions and offering costs. In addition, upon closing the IPO, all outstanding shares of the Company’s convertible preferred stock converted into 17,797,026 shares of common stock. Additionally, the $33.0 million aggregate outstanding principal amount and $0.8 million accrued interest of the 2020 Notes converted into 2,561,484 shares of common stock at a conversion price of $13.20 per share. In connection with the completion of its IPO, on October 5, 2020, the Company’s certificate of incorporation was amended and restated to provide for 200,000,000 authorized shares of common stock with a par value of $0.001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.001 per share. Liquidity and Going Concern The Company has incurred operating losses and negative cash flows from operations to date and has an accumulated deficit of $291.4 million as of December 31, 2021. During the years ended December 31, 2021, and 2020, the Company used $41.4 million, and $30.6 million of cash in its operating activities, respectively. As of December 31, 2021, the Company had cash, cash equivalents and marketable securities of $191.0 million. Historically, the Company’s activities have been financed through private placements of equity securities, debt and sale of common stock in the IPO. The Company’s consolidated financial statements have been prepared on the basis of the Company continuing as a going concern for the next 12 months. Management believes that the Company’s existing cash, cash equivalents and marketable securities will allow the Company to continue its planned operations for at least the next 12 months from the date of the issuance of these consolidated financial statements. Impact of the COVID-19 Pandemic The COVID-19 pandemic has resulted in public health responses including travel bans, social distancing requirements, quarantines, stay-at-home orders and other significant measures, which have delayed clinical trials and FDA operations and adversely impacted the number of procedures performed using our products. In the markets in which we operate, elective, specialty and other procedures and appointments have been suspended or canceled to avoid non-essential patient exposure to medical environments and potential infection with COVID-19 and to focus limited resources and personnel capacity toward the treatment of COVID-19 patients. As a result, we have experienced a material adverse impact on our business, financial condition and results of operations from a decrease and delay of procedures involving our products. The COVID-19-driven impact on procedure volumes, which began in 2020, extended throughout 2021. At the start of 2021, procedure volumes in our U.S. and international markets were adversely impacted by a winter COVID surge. Beginning in March 2021, we observed indicators of recovery in our U.S. markets which continued through the second quarter. During the third quarter of 2021, procedure volumes were adversely impacted by the Delta variant of COVID-19 in certain regions of the U.S. During the fourth quarter of 2021, procedure volumes were again adversely impacted in certain regions of the U.S. and Europe by the Delta and Omicron variants; however, we experienced some recovery in certain of our other U.S. markets. We may continue to see regional variations in procedure volumes in our US and international markets from the COVID-19 pandemic and its variants. The Company’s consolidated financial statements reflect judgments and estimates that could change in the future as a result of the COVID-19 pandemic. The COVID-19 pandemic has adversely impacted the Company’s business, financial condition and results of operations by decreasing and delaying procedures performed using its products. While many regions begin to stabilize with improvements in procedure volumes, there continues to be variability and uncertainty as variants of the virus emerge. The Company can make no assurance regarding any future level of demand for the Company’s products, and COVID-19 may adversely impact the results of operations and financial condition.