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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total stock-based compensation expense $ 5,925 $ 4,500 $ 11,428 $ 10,020
Location, Statement of Income, Balance [Axis]: us-gaap:MarketingExpense        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total stock-based compensation expense 257 112 476 226
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total stock-based compensation expense 3,043 2,082 5,893 4,843
Location, Statement of Income, Balance [Axis]: tdup:OperationsProductAndTechnologyExpense        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total stock-based compensation expense $ 2,625 $ 2,306 $ 5,059 $ 4,951