Cover - shares	6 Months Ended
	Jun. 30, 2025	Jul. 31, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
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	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		166,219,140
Central Index Key	0001736297
amendment flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Document Fiscal Year End Date	--12-31