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Organization and Description of Business	6 Months Ended
Organization and Description of Business	Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. Organization and Description of Business ThredUp Inc. (“ThredUp” or the “Company”) was formed as a corporation in the State of Delaware in January 2009. ThredUp operates a large resale platform that enables consumers to buy and sell primarily secondhand apparel, shoes, and accessories.