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SEGMENT INFORMATION - Schedule of Revenue by Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Schedule of Revenue by Segment [Line Items]
Number of operating segments | segment	2		2
Total revenue	$ 304,019	$ 495,612	$ 1,073,815	$ 1,606,599
North America
Schedule of Revenue by Segment [Line Items]
Total revenue	180,311	303,596	648,797	985,421
International
Schedule of Revenue by Segment [Line Items]
Total revenue	123,708	192,016	425,018	621,178
UNITED STATES
Schedule of Revenue by Segment [Line Items]
Total revenue	177,300	297,900	640,400	965,900
UNITED KINGDOM
Schedule of Revenue by Segment [Line Items]
Total revenue	42,900	69,400	151,100	221,800
Product
Schedule of Revenue by Segment [Line Items]
Total revenue	148,946	227,532	599,337	775,089
Product | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue	68,215	111,776	293,729	394,235
Product | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue	80,731	115,756	305,608	380,854
Service
Schedule of Revenue by Segment [Line Items]
Total revenue	155,073	268,080	474,478	831,510
Service | North America
Schedule of Revenue by Segment [Line Items]
Total revenue	112,096	191,820	355,068	591,186
Service | International
Schedule of Revenue by Segment [Line Items]
Total revenue	42,977	76,260	119,410	240,324
Service | Local | North America
Schedule of Revenue by Segment [Line Items]
Total revenue	98,561	175,140	322,945	532,599
Service | Local | International
Schedule of Revenue by Segment [Line Items]
Total revenue	36,528	65,440	103,221	208,625
Service | Goods | North America
Schedule of Revenue by Segment [Line Items]
Total revenue	8,787	3,000	18,401	9,841
Service | Goods | International
Schedule of Revenue by Segment [Line Items]
Total revenue	3,309	2,817	8,821	6,882
Service | Travel | North America
Schedule of Revenue by Segment [Line Items]
Total revenue	4,748	13,680	13,722	48,746
Service | Travel | International
Schedule of Revenue by Segment [Line Items]
Total revenue	$ 3,140	$ 8,003	$ 7,368	$ 24,817

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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