Quarterly report [Sections 13 or 15(d)]

Document and Entity Information

v3.26.1
Document and Entity Information - shares
 3 Months Ended
Apr. 04, 2026
Apr. 30, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Apr. 04, 2026  
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 4910 Airport Plaza Drive  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Long Beach  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90815  
City Area Code 424  
Local Phone Number 702-1455  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Smaller Reporting Company true  
Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   80,578,054
Entity Central Index Key 0001378950  
Current Fiscal Year End Date --01-02  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol PRTS  
Security Exchange Name NASDAQ  
Series B junior participating preferred stock purchase right    
Document Information [Line Items]    
Title of 12(b) Security Series B Junior Participating Preferred Stock Purchase Right  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ