Segment Information - Summary of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues from external customers	$ 923,775	$ 591,118
Gross profit	81,640	36,176
Ecommerce
Segment Reporting Information [Line Items]
Revenues from external customers	675,364	422,308
Gross profit	34,320	31,837
Wholesale
Segment Reporting Information [Line Items]
Revenues from external customers	139,984	118,024
Gross profit	(2,753)	(282)
TDA
Segment Reporting Information [Line Items]
Revenues from external customers	56,271	47,587
Gross profit	1,806	2,791
Retail Financing
Segment Reporting Information [Line Items]
Revenues from external customers	47,687
Gross profit	44,963
All Other
Segment Reporting Information [Line Items]
Revenues from external customers	4,469	3,199
Gross profit	$ 3,304	$ 1,830