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Segment Information - Summary of Reportable Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues from external customers $ 1,357,700 $ 1,191,821 $ 855,429
Gross profit (loss) 71,545 57,859 60,807
Ecommerce      
Segment Reporting Information [Line Items]      
Revenues from external customers 915,451 588,114 301,172
Gross profit (loss) 60,861 32,127 22,425
Wholesale      
Segment Reporting Information [Line Items]      
Revenues from external customers 245,580 213,464 174,514
Gross profit (loss) (1,432) 340 3,257
TDA      
Segment Reporting Information [Line Items]      
Revenues from external customers 196,669 390,243 379,743
Gross profit (loss) $ 12,116 $ 25,392 $ 35,125