SEGMENT AND GEOGRAPHICAL INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segment and geographical information
Number of segments | segment			1
Revenues	$ 68,349	$ 51,929	$ 202,942	$ 162,212
Americas
Segment and geographical information
Revenues	41,524	29,239	122,581	86,832
Europe
Segment and geographical information
Revenues	19,732	16,611	61,443	56,885
Asia Pacific
Segment and geographical information
Revenues	$ 7,093	$ 6,079	$ 18,918	$ 18,495