PROPERTY AND EQUIPMENT, NET Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	$ 160	$ 235
Property, plant and equipment, gross	41,963	38,841
Less: acccumulated depreciation and amortization	35,790	31,800
Property and equipment, net	6,173	7,041
Capital lease obligation, current	74	65
Capital lease obligation, non-current	78	140
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,180	5,888
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,506	2,244
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,532	17,010
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,745	$ 13,699