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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