v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
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 2345 North First Street  
Entity Address, Address Line Two  
Entity Address City Or Town San Jose  
Entity Address State Or Province CA  
Entity Address Postal Zip Code 95131  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   173,485,104
Central Index Key 0001736297  
amendment flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Document Fiscal Year End Date --12-31