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SEGMENTS - Geographical Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Document Period End Date			Sep. 30, 2019
Revenues	$ 56,419	$ 34,582	$ 141,137	$ 102,865
Property and equipment	12,125		12,125		$ 10,230
United States
Segment Reporting Information [Line Items]
Revenues	50,997	30,884	125,468	90,606
Property and equipment	11,583		11,583		9,794
United Kingdom
Segment Reporting Information [Line Items]
Revenues	5,422	$ 3,698	15,669	$ 12,259
Property and equipment	$ 384		$ 384		$ 436

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