Description of Business and Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of the Business—The “Company” or “AtriCure” consists of AtriCure, Inc. and its wholly-owned subsidiaries. The Company is a leading innovator in surgical treatments and therapies for atrial fibrillation (Afib), left atrial appendage (LAA) management and post-operative pain management, and sells its products to medical centers globally through its direct sales force and distributors. Basis of Presentation—The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (SEC). All intercompany accounts and transactions have been eliminated in consolidation. The accompanying interim financial statements are unaudited, but in the opinion of the Company’s management, contain all normal, recurring adjustments considered necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States of America (GAAP) applicable to interim periods. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted or condensed. The Company believes the disclosures herein are adequate to make the information presented not misleading. Results of operations are not necessarily indicative of the results expected for the full year or for any future period. The accompanying interim financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC. Except as discussed herein, there have been no changes in the Company's significant accounting policies for the nine months ended September 30, 2025 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2024. Use of Estimates—The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense. Actual results could differ from those estimates. Segments—The Company evaluates reporting segments in accordance with the Financial Accounting Standards Board's (FASB) Accounting Standards Codification (ASC) 280, "Segment Reporting". The chief operating decision maker is its Chief Executive Officer. The Company has one business activity and operates as one operating segment: the development, manufacture and sale of devices used by physicians in surgical procedures, designed primarily for ablation of cardiac tissue, exclusion of the left atrial appendage and ablation of peripheral nerves. These devices are developed and marketed to a broad base of medical centers globally. Management considers all such sales to be part of the single operating segment. The Chief Executive Officer is regularly provided with consolidated expenses consistent with the presented consolidated statements of operations, accompanied by revenue information by product type and geographic area, for purposes of allocating resources and evaluating financial performance. Revenue by product type and geographic area is included at Note 9 – Revenue. The Company’s long-lived assets are located in the United States, except for $5,891 as of September 30, 2025 and $4,021 as of December 31, 2024 located primarily in Europe. Earnings Per Share—Basic and diluted net loss per share are computed by dividing the net loss by the weighted average number of common shares outstanding during the period. Since the Company has experienced net losses for all periods presented, net loss per share excludes the effect of 2,897 and 2,724 shares as of September 30, 2025 and 2024 because they are anti-dilutive. Therefore, the number of shares used for basic and diluted net loss per share are the same. Sale-and-Leaseback Transaction—Sale-and-leaseback transactions occur when a company sells assets to a third-party and simultaneously leases them back. In accordance with FASB ASC 842, "Leases", for potential sale-and-leaseback transactions, the Company assesses the contract to identify if a sale occurred via transfer of control of the assets in accordance with ASC 606 "Revenue from Contracts with Customers". In cases where control has not transferred, we continue to recognize the underlying asset within Property and equipment, net within the consolidated balance sheets, which is then depreciated over the shorter of the remaining useful life or lease term. Additionally, a financial liability is recognized and referred to as a financing obligation and is accounted for similarly to debt or finance leases. Rental payments are recognized as a reduction of the financing obligation and interest expense using the effective interest method. During the quarter ended September 30, 2025, the Company entered into one failed sale-and-leaseback transaction. See additional discussion in Note 6 – Borrowings and Financing Obligation. Recently Issued Accounting Pronouncements Not Yet Adopted—In September 2025, the FASB issued Accounting Standards Update (ASU) No. 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Topic 350-40): Targeted Improvements to the Accounting for Internal-Use Software". This amendment modernizes and makes targeted improvements to the accounting for software costs found under Topic 350-40, effective for fiscal years and interim periods beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the impact of adopting this standard on its consolidated financial statements and disclosures.

Nature of the Business—The “Company” or “AtriCure” consists of AtriCure, Inc. and its wholly-owned subsidiaries. The Company is a leading innovator in surgical treatments and therapies for atrial fibrillation (Afib), left atrial appendage (LAA) management and post-operative pain management, and sells its products to medical centers globally through its direct sales force and distributors.

Basis of Presentation—The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (SEC). All intercompany accounts and transactions have been eliminated in consolidation. The accompanying interim financial statements are unaudited, but in the opinion of the Company’s management, contain all normal, recurring adjustments considered necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States of America (GAAP) applicable to interim periods. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted or condensed. The Company believes the disclosures herein are adequate to make the information presented not misleading. Results of operations are not necessarily indicative of the results expected for the full year or for any future period.

The accompanying interim financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC. Except as discussed herein, there have been no changes in the Company's significant accounting policies for the nine months ended September 30, 2025 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2024.

Use of Estimates—The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense. Actual results could differ from those estimates.

Segments—The Company evaluates reporting segments in accordance with the Financial Accounting Standards Board's (FASB) Accounting Standards Codification (ASC) 280, "Segment Reporting". The chief operating decision maker is its Chief Executive Officer. The Company has one business activity and operates as one operating segment: the development, manufacture and sale of devices used by physicians in surgical procedures, designed primarily for ablation of cardiac tissue, exclusion of the left atrial appendage and ablation of peripheral nerves. These devices are developed and marketed to a broad base of medical centers globally. Management considers all such sales to be part of the single operating segment. The Chief Executive Officer is regularly provided with consolidated expenses consistent with the presented consolidated statements of operations, accompanied by revenue information by product type and geographic area, for purposes of allocating resources and evaluating financial performance. Revenue by product type and geographic area is included at Note 9 – Revenue. The Company’s long-lived assets are located in the United States, except for $5,891 as of September 30, 2025 and $4,021 as of December 31, 2024 located primarily in Europe.

Earnings Per Share—Basic and diluted net loss per share are computed by dividing the net loss by the weighted average number of common shares outstanding during the period. Since the Company has experienced net losses for all periods presented, net loss per share excludes the effect of 2,897 and 2,724 shares as of September 30, 2025 and 2024 because they are anti-dilutive. Therefore, the number of shares used for basic and diluted net loss per share are the same.

Sale-and-Leaseback Transaction—Sale-and-leaseback transactions occur when a company sells assets to a third-party and simultaneously leases them back. In accordance with FASB ASC 842, "Leases", for potential sale-and-leaseback transactions, the Company assesses the contract to identify if a sale occurred via transfer of control of the assets in accordance with ASC 606 "Revenue from Contracts with Customers". In cases where control has not transferred, we continue to recognize the underlying asset within Property and equipment, net within the consolidated balance sheets, which is then depreciated over the shorter of the remaining useful life or lease term. Additionally, a financial liability is recognized and referred to as a financing obligation and is accounted for similarly to debt or finance leases. Rental payments are recognized as a reduction of the financing obligation and interest expense using the effective interest method. During the quarter ended September 30, 2025, the Company entered into one failed sale-and-leaseback transaction. See additional discussion in Note 6 – Borrowings and Financing Obligation.

Recently Issued Accounting Pronouncements Not Yet Adopted—In September 2025, the FASB issued Accounting Standards Update (ASU) No. 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Topic 350-40): Targeted Improvements to the Accounting for Internal-Use Software". This amendment modernizes and makes targeted improvements to the accounting for software costs found under Topic 350-40, effective for fiscal years and interim periods beginning after December 15, 2027, with early adoption permitted. The Company is evaluating the impact of adopting this standard on its consolidated financial statements and disclosures.