REVENUE RECOGNITION, Impact of Adopting Topic 606 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues
Total revenues	$ 17,537	$ 16,374
Gross Profit	9,621	9,070
Operating expenses
Selling, general and administrative	11,548	10,690
Operating loss	(2,114)	(1,841)
ASSETS [Abstract]
Accounts and other receivables, net	9,128		$ 13,225
Deferred commission expense	3,549		3,649
Other assets, net	2,898		3,847
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Deferred revenue - current portion	15,607	9,603	15,540
Deferred revenue - long term	5,688	10,182	7,526
Accumulated deficit	(54,259)		$ (52,329)
ASC 606 [Member]
ASSETS [Abstract]
Accounts and other receivables, net	432
Deferred commission expense	3,549
Professional Sales Services [Member]
Revenues
Total revenues	5,211	$ 5,871
Prior U.S. GAAP [Member]
Revenues
Total revenues	17,481
Gross Profit	9,565
Operating expenses
Selling, general and administrative	11,604
Operating loss	(2,226)
ASSETS [Abstract]
Accounts and other receivables, net	8,696
Deferred commission expense	3,548
Other assets, net	2,704
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Deferred revenue - current portion	15,273
Deferred revenue - long term	5,646
Accumulated deficit	(54,511)
Prior U.S. GAAP [Member] | Professional Sales Services [Member]
Revenues
Total revenues	5,155
Topic 606 Impact [Member]
Revenues
Total revenues	56
Gross Profit	56
Operating expenses
Selling, general and administrative	(56)
Operating loss	112
ASSETS [Abstract]
Accounts and other receivables, net	432
Deferred commission expense	1
Other assets, net	194
LIABILITIES AND STOCKHOLDERS' EQUITY [Abstract]
Deferred revenue - current portion	334
Deferred revenue - long term	42
Accumulated deficit	252
Topic 606 Impact [Member] | Professional Sales Services [Member]
Revenues
Total revenues	$ 56