SEGMENT AND GEOGRAPHICAL INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
SEGMENT AND GEOGRAPHICAL INFORMATION
Number of segments | segment	1
Segment and geographical information
Revenues	$ 49,929	$ 50,539
Americas
Segment and geographical information
Revenues	25,922	27,616
Europe
Segment and geographical information
Revenues	19,053	18,061
Asia Pacific
Segment and geographical information
Revenues	$ 4,954	$ 4,862