SEGMENT AND GEOGRAPHICAL INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
SEGMENT AND GEOGRAPHICAL INFORMATION
Number of segments | segment									1
Segment and geographical information
Revenues	$ 53,886	$ 51,404	$ 53,411	$ 50,539	$ 53,230	$ 53,258	$ 54,888	$ 48,241	$ 209,240	$ 209,617	$ 210,982
Furniture, fixtures and equipment, net of accumulated depreciation of $7,231 and $6,143, respectively	3,021				3,478				3,021	3,478	3,213
Americas
Segment and geographical information
Revenues									108,925	105,915	114,603
Furniture, fixtures and equipment, net of accumulated depreciation of $7,231 and $6,143, respectively	1,907				2,131				1,907	2,131	2,064
Europe
Segment and geographical information
Revenues									77,781	84,107	75,127
Furniture, fixtures and equipment, net of accumulated depreciation of $7,231 and $6,143, respectively	955				1,130				955	1,130	912
Asia Pacific
Segment and geographical information
Revenues									22,534	19,595	21,252
Furniture, fixtures and equipment, net of accumulated depreciation of $7,231 and $6,143, respectively	$ 159				$ 217				159	217	237
Germany
Segment and geographical information
Revenues									29,400	31,800	30,100
United Kingdom
Segment and geographical information
Revenues									21,200	19,900	19,900
Australia
Segment and geographical information
Revenues									$ 17,300	$ 14,300	$ 16,100