Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 29, 2018
Oct. 26, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name U.S. Auto Parts Network, Inc.  
Entity Central Index Key 0001378950  
Current Fiscal Year End Date --12-29  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Sep. 29, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) Q3  
Trading Symbol PRTS  
Amendment Flag false  
Emerging Growth Company false  
Smaller Reporting Company true  
Entity Common Stock, Shares Outstanding   34,986,782