Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2017
Mar. 09, 2018
Jul. 01, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name U.S. Auto Parts Network, Inc.    
Entity Central Index Key 0001378950    
Current Fiscal Year End Date --12-30    
Entity Filer Category Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 30, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol PRTS    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   34,858,147  
Entity Public Float     $ 91.4