Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information
9 Months Ended
Sep. 27, 2014
Nov. 03, 2014
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Period End Date Sep. 27, 2014  
Amendment Flag false  
Document fiscal year focus 2014  
Document Fiscal Period Focus Q3  
Trading Symbol PRTS  
Entity Registrant Name U.S. Auto Parts Network, Inc.  
Entity Central Index Key 0001378950  
Current Fiscal Year End Date --01-03  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   33,564,338