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Cover - shares
 6 Months Ended
Jun. 30, 2026
Jul. 29, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-40249  
Entity Registrant Name ThredUp Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-4009181  
Entity Address, Address Line One 969 Broadway  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Oakland  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94607  
City Area Code 415  
Local Phone Number 402-5202  
Title of 12(b) Security Class A Common Stock, $0.0001 par value per share  
Trading Symbol TDUP  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Amendment Flag false  
Entity Central Index Key 0001484778  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   111,010,151
Class B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   20,323,499