Goodwill and Intangible Assets - Summary of Activity in Goodwill by Segment (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Goodwill [Line Items]
Beginning Balance	$ 78,172	$ 78,172
Change in carrying amount
Acquisition	81,134
Ending Balance	159,306	78,172
Ecommerce
Goodwill [Line Items]
Beginning Balance	72,231	72,231
Change in carrying amount
Acquisition	81,134
Ending Balance	153,365	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

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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