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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-41979    
Entity Registrant Name Astera Labs, Inc.    
Entity Incorporation State Country Code DE    
Entity Tax Identification Number 82-3437062    
Entity Address, Address Line One 2901 Tasman Drive    
Entity Address, Address Line Two Suite 205    
Entity Address City Or Town Santa Clara    
Entity Address State Or Province CA    
Entity Address Postal Zip Code 95054    
City Area Code (408)    
Local Phone Number 766-3806    
Security 12b Title Common Stock, par value $0.0001 per share    
Trading Symbol ALAB    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 6.6
Entity Common Stock, Shares Outstanding   162,153,472  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of Part III of this Form 10-K are incorporated by reference from the registrant’s definitive proxy statement for its 2025 annual meeting of shareholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10-K. Except with respect to information specifically incorporated by reference in this Form 10-K, the proxy statement is not deemed to be filed as part of this Form 10-K.
    
Entity Central Index Key 0001736297    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false