Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
 9 Months Ended
Oct. 02, 2021
Oct. 28, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Oct. 02, 2021  
Entity File Number 001-33264  
Entity Registrant Name CARPARTS.COM, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 68-0623433  
Entity Address, Address Line One 2050 W. 190th Street  
Entity Address, Address Line Two Suite 400  
Entity Address, City or Town Torrance  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90504  
City Area Code 424  
Local Phone Number 702-1455  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol PRTS  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Smaller Reporting Company false  
Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   52,540,398
Current Fiscal Year End Date --01-01  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001378950  
Amendment Flag false