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Document And Entity Information - shares
 9 Months Ended
Sep. 29, 2019
Oct. 21, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 29, 2019  
Document Transition Report false  
Entity File Number 001-38618  
Entity Registrant Name ARLO TECHNOLOGIES, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 38-4061754  
Entity Address, Address Line One 3030 Orchard Parkway  
Entity Address, City or Town San Jose,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95134  
City Area Code 408  
Local Phone Number 890-3900  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol ARLO  
Security Exchange Name NYSE  
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 Shell Company false  
Entity Common Stock, Shares Outstanding   75,708,491
Entity Central Index Key 0001736946  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Ex Transition Period false