Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements of Inspire Medical Systems, Inc. (we, us, our, or the Company) have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). The information included in this Form 10-Q should be read in conjunction with our most recent Form 10-K. We use the same accounting policies in preparing quarterly and annual financial statements. All adjustments necessary for a fair presentation of quarterly and year to date operating results are reflected herein. The results of operations for the three- and six-month periods ended June 30, 2026 are not necessarily indicative of the results to be expected for the full year.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income-Expense Disaggregation (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03). The guidance requires the disclosure of additional information related to certain costs and expenses, including amounts of inventory purchases, employee compensation, and depreciation and amortization included in each income statement line item. ASU 2024-03 also requires disclosure of the total amount of selling expenses and our definition of selling expenses. The ASU is effective for the annual reporting period beginning after December 15, 2026 and interim reporting periods within the annual reporting period beginning after December 15, 2027, with early adoption permitted. We are currently evaluating the impact that adoption of this ASU may have on our financial statements and disclosures. In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Targeted Improvements to the Accounting for Internal-Use Software. This ASU modifies the criteria for when software costs may be capitalized by eliminating consideration of software project development stages and by enhancing guidance for the "probable-to-complete" threshold. The update is effective for annual reporting periods beginning after December 15, 2027 including interim periods within those fiscal years, with early adoption permitted. We are currently evaluating the impact that adoption of this ASU may have on our financial statements and disclosures. We have reviewed and considered all other recent accounting pronouncements that have not yet been adopted and believe there are none that could potentially have a material impact on our business practices, financial condition, results of operations, or disclosures.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Financial assets and liabilities are classified in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement: Level 1 (observable inputs, such as quoted prices (unadjusted) for identical assets or liabilities in active markets); Level 2 (inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly); and Level 3 (unobservable inputs that are supported by little or no market activities, which would require us to develop our own assumptions). We do not have any Level 3 financial assets or liabilities.
Equity Securities without Readily Determinable Fair Values	Equity Securities without Readily Determinable Fair Values For equity securities without readily determinable fair values, we have elected the measurement alternative under which we measure these investments at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2026

The consolidated financial statements of Inspire Medical Systems, Inc. (we, us, our, or the Company) have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). The information included in this Form 10-Q should be read in conjunction with our most recent Form 10-K. We use the same accounting policies in preparing quarterly and annual financial statements. All adjustments necessary for a fair presentation of quarterly and year to date operating results are reflected herein. The results of operations for the three- and six-month periods ended June 30, 2026 are not necessarily indicative of the results to be expected for the full year.

Recent Accounting Pronouncements Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income-Expense Disaggregation (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03). The guidance requires the disclosure of additional information related to certain costs and expenses, including amounts of inventory purchases, employee compensation, and depreciation and amortization included in each income statement line item. ASU 2024-03 also requires disclosure of the total amount of selling expenses and our definition of selling expenses. The ASU is effective for the annual reporting period beginning after December 15, 2026 and interim reporting periods within the annual reporting period beginning after December 15, 2027, with early adoption permitted. We are currently evaluating the impact that adoption of this ASU may have on our financial statements and disclosures.

In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Targeted Improvements to the Accounting for Internal-Use Software. This ASU modifies the criteria for when software costs may be capitalized by eliminating consideration of software project development stages and by enhancing guidance for the "probable-to-complete" threshold. The update is effective for annual reporting periods beginning after December 15, 2027 including interim periods within those fiscal years, with early adoption permitted. We are currently evaluating the impact that adoption of this ASU may have on our financial statements and disclosures.

We have reviewed and considered all other recent accounting pronouncements that have not yet been adopted and believe there are none that could potentially have a material impact on our business practices, financial condition, results of operations, or disclosures.

Fair Value of Financial Instruments

Financial assets and liabilities are classified in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement: Level 1 (observable inputs, such as quoted prices (unadjusted) for identical assets or liabilities in active markets); Level 2 (inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly); and Level 3 (unobservable inputs that are supported by little or no market activities, which would require us to develop our own assumptions). We do not have any Level 3 financial assets or liabilities.

Equity Securities without Readily Determinable Fair Values

For equity securities without readily determinable fair values, we have elected the measurement alternative under which we measure these investments at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer.