Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The Company’s unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to the authoritative United States generally accepted accounting principles as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”). Principles of Consolidation The unaudited interim condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Unaudited Interim Financial Information The condensed consolidated balance sheet as of December 31, 2023 was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. The accompanying unaudited interim condensed consolidated financial statements as of June 30, 2024 and for the three and six months ended June 30, 2024 and June 30, 2023, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. Accordingly, these financial statements should be read in conjunction with the audited financial statements as of and for the fiscal year ended December 31, 2023 and notes thereto, included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC on February 27, 2024. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of June 30, 2024 and condensed consolidated results of operations for the three and six months ended June 30, 2024 and June 30, 2023 and condensed consolidated cash flows for the six months ended June 30, 2024 and June 30, 2023 have been made. The results of operations for the three and six months ended June 30, 2024 are not necessarily indicative of the results of operations that may be expected for the fiscal year ending December 31, 2024. Use of Estimates The preparation of unaudited interim condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited interim condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Although these estimates are based on the Company’s knowledge of current events and actions it may undertake in the future, actual results may ultimately materially differ from these estimates and assumptions. Significant estimates and assumptions include reserves and write-downs related to inventories, classification of short-term and long-term inventories, the recoverability of long-term assets, stock-based compensation, intangible assets, goodwill, deferred tax assets and related valuation allowances and impact of contingencies. Fair Value of Financial Instruments The carrying amounts of the Company’s financial instruments consisting of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their relatively short maturities. Based on the borrowing rates currently available to the Company for debt with similar terms and consideration of default and credit risk, the carrying value of the term loan approximates their fair value. The fair value of marketable debt securities is estimated using Level 1 and Level 2 inputs (Note 4). Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of risk consist principally of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents balances with established financial institutions and, at times, such balances with any one financial institution may be in excess of the Federal Deposit Insurance Corporation (“FDIC”) insured limits. As of June 30, 2024 and December 31, 2023, the Company also had cash on deposit with foreign banks of approximately $5.7 million and $4.7 million, respectively, that was not federally insured. The Company earns revenue primarily from the sale of its products to hospitals and other customers such as distributors. Sales of Zephyr Valves and delivery catheters accounted for most of the Company’s revenue for the six months ended June 30, 2024 and June 30, 2023. The Company’s accounts receivable are derived from revenue earned from customers. The Company performs ongoing credit evaluations of its customers’ financial condition and generally requires no collateral from its customers. As of June 30, 2024 and December 31, 2023, no customer accounted for more than 10% of accounts receivable. For the three and six months ended June 30, 2024 and June 30, 2023, no customer accounted for more than 10% of revenue. The Company relies on single source suppliers for the components, sub-assemblies and materials for its products. These components, sub-assemblies and materials are critical and there are no or relatively few alternative sources of supply. The Company’s suppliers have generally met the Company’s demand for their products and services on a timely basis in the past. Foreign Currency Translation and Transaction Gains and Losses The functional currencies of the Company’s wholly owned subsidiaries in Switzerland, Germany, Australia, the United Kingdom, France and Hong Kong are the Swiss franc. The functional currency of the Company’s subsidiaries in Italy and Japan is the Euro and Yen, respectively. Accordingly, asset and liability accounts of Switzerland, France, Germany, Australia, the United Kingdom, Italy, Hong Kong and Japan operations are translated into U.S. dollars using the current exchange rate in effect at the balance sheet date and equity accounts are translated into U.S. dollars using historical rates. The revenues and expenses are translated using the average exchange rates in effect during the period, and gains and losses from foreign currency translation adjustments are included as a component of accumulated other comprehensive income in the condensed consolidated balance sheet. Foreign currency translation adjustments are recorded in other comprehensive income (loss) in the condensed consolidated statements of operations and comprehensive loss and was less than $0.1 million and $0.2 million during the three months ended June 30, 2024 and June 30, 2023, respectively, and $(0.5) million and $0.2 million during the six months ended June 30, 2024 and June 30, 2023, respectively. Foreign currency transaction gains and losses are included in other (expense) income, net in the condensed consolidated statements of operations and comprehensive loss and was less than $(0.1) million and $(0.2) million during the three months ended June 30, 2024 and June 30, 2023, respectively, and $0.3 million and $(0.2) million during the six months ended June 30, 2024 and June 30, 2023, respectively. Credit Losses—Accounts Receivable Accounts receivable are recorded at the amounts billed less estimated allowances for credit losses for any potential uncollectible amounts. The Company continually monitors customer payments and maintains an allowance for estimated losses resulting from a customer’s inability to make required payments. The Company considers factors such as historical experience, credit quality, age of the accounts receivable balances, geographic related risks and economic conditions that may affect a customer’s ability to pay. Accounts receivable are written-off and charged against an allowance for credit losses when the Company has exhausted collection efforts without success. As of June 30, 2024 and December 31, 2023, accounts receivable is presented net of an allowance for credit losses of less than $0.1 million and $0, respectively. Net Loss per Share Attributable to Common Stockholders Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common stock outstanding during the period, without consideration of potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common stock and potentially dilutive securities outstanding for the period. For purposes of the diluted net loss per share calculation, stock options and common stock subject to repurchase related to early exercise of stock options are considered to be potentially dilutive securities. Basic and diluted net loss attributable to common stockholders per share is presented in conformity with the two-class method required for participating securities. The Company considers the shares issued upon the early exercise of stock options subject to repurchase to be participating securities, because holders of such shares have non-forfeitable dividend rights in the event a dividend is paid on common stock. The holders of the shares issued upon early exercise of stock options subject to repurchase do not have a contractual obligation to share in the Company’s losses. As such, the net loss was attributed entirely to common stockholders. Because the Company has reported a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share for those periods.