PROPERTY AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 40,918	$ 38,841
Less: acccumulated depreciation and amortization	34,667	31,800
Property and equipment, net	6,251	7,041
Construction in Progress, Gross	297	235
Capital lease obligation, current	75	65
Capital lease obligation, non-current	52	140
Capital lease obligations incurred	0	0
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,945	5,888
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,470	2,244
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,306	17,010
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,197	$ 13,699