Nature of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and notes have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the SEC regarding interim financial information. Certain information and disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The unaudited condensed consolidated financial statements and related notes should be read in conjunction with the audited consolidated financial statements and related notes as of and for the year ended December 31, 2024, included in its Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC on February 14, 2025. In the opinion of management, all adjustments, including normal recurring adjustments, that are considered necessary for a fair presentation of results of operations and financial position, have been included. Operating results for the periods presented herein are not necessarily indicative of the results of operations to be anticipated for the full fiscal year or any future period.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of Astera Labs, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with 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 financial statements and the reported amounts of revenue and expenses during the reporting periods. The Company’s significant estimates include, but are not limited to, revenue recognition, the valuation of deferred tax assets, reserves for uncertain tax positions, the grant date fair value of common stock awards, and the valuation and assumptions underlying stock-based compensation. By their nature, estimates are subject to an inherent degree of uncertainty and actual results could differ from those estimates. The Company assessed certain accounting matters and estimates that generally require consideration of forecasted information available to the Company. Management is not aware of any specific event or circumstance that would require an update to estimates or judgments or a revision to the carrying value of assets or liabilities. These estimates and judgments may change as new events occur and additional information is obtained, which may result in changes being recognized in the Company’s consolidated financial statements in future periods, and actual results could differ from these estimates.
Reclassifications	Reclassifications Certain prior period balances were reclassified to conform to the current period’s presentation. None of these reclassifications had an impact on reported net income or cash flows for any of the periods presented.
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid. The ASU is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company does not expect a material impact from the adoption of this standard on its consolidated financial statements and related disclosures. In November 2024, the FASB issued Accounting Standards Update No. 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosure (“ASU 2024-03”), and in January 2025, the FASB issued Accounting Standard Update No. 2025-01, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosure (Subtopic 2020-40): Clarifying the Effective Date (“ASU 2025-01”). ASU 2024-03 requires additional disclosures of the nature of expenses included in the income statement and disclosures about specific expense categories included in the expense captions presented in the statements of operations. ASU 2024-03, as clarified by ASU 2025-01, is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027. Both early adoption and retrospective application are permitted. The Company is currently evaluating the impact that the adoption of these new standards will have on its consolidated financial statements and related disclosures.