Goodwill and Intangible Assets - Summary of Activity in Goodwill by Segment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Beginning Balance	$ 78,172	$ 78,172
Change in carrying amount
Acquisition	80,645
Ending Balance	158,817	78,172
Ecommerce
Goodwill [Line Items]
Beginning Balance	72,231	72,231
Change in carrying amount
Acquisition	80,645
Ending Balance	152,876	72,231
Wholesale
Goodwill [Line Items]
Beginning Balance	1,720	1,720
Change in carrying amount
Ending Balance	1,720	1,720
TDA
Goodwill [Line Items]
Beginning Balance	4,221	4,221
Change in carrying amount
Ending Balance	$ 4,221	$ 4,221