Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Mar. 05, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 28, 2019    
Entity Registrant Name U.S. AUTO PARTS NETWORK, INC.    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Interactive Data Current Yes    
Smaller Reporting Company true    
Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   36,621,447  
Entity Public Float     $ 28.3
Current Fiscal Year End Date --12-28    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001378950    
Amendment Flag false