Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.3.0.814
Document and Entity Information - shares
9 Months Ended
Oct. 03, 2015
Oct. 30, 2015
Document And Entity Information [Abstract]    
Entity Registrant Name U.S. Auto Parts Network, Inc.  
Entity Central Index Key 0001378950  
Current Fiscal Year End Date --01-02  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q  
Document Period End Date Oct. 03, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Trading Symbol PRTS  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   34,080,828