Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.22.0.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2022
Feb. 22, 2022
Jul. 02, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 01, 2022    
Current Fiscal Year End Date --01-01    
Document Transition Report false    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Smaller Reporting Company false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 933.1
Entity Common Stock, Shares Outstanding   53,098,973  
Entity Central Index Key 0001378950    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Irvine, California