SEGMENT INFORMATION - Geographic Area and Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues From External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 47,179	$ 44,611
Property and equipment, net	39,124		$ 39,251
United States
Revenues From External Customers and Long-Lived Assets [Line Items]
Total revenue	42,529	39,830
Property and equipment, net	37,384		37,378
International
Revenues From External Customers and Long-Lived Assets [Line Items]
Total revenue	4,650	$ 4,781
Property and equipment, net	$ 1,740		$ 1,873