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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2019
Mar. 03, 2020
Jun. 29, 2019
Document And Entity Information [Abstract]      
Entity Registrant Name NETLIST INC    
Entity Central Index Key 0001282631    
Document Type 10-K    
Document Period End Date Dec. 28, 2019    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-28    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 42.1
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   169,500,899