INCOME TAXES (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Tax open years subject to examination [Line Items]
Net tax impact from ASU 2016-09	$ 0		$ 0
Income tax benefit (provision)	172,000	$ 146,000
Pre-tax income (loss)	$ (2,725,000)	$ (333,000)
Effective income tax rate	(6.30%)	(43.80%)
Unrecognized tax benefits	$ 1,973,000		1,682,000
Accrued interest and penalties	570,000		$ 566,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 14,000	$ 12,000
U.S. Federal
Tax open years subject to examination [Line Items]
Open Tax Year	2014
Majority of U.S. state and local jurisdictions
Tax open years subject to examination [Line Items]
Open Tax Year	2013
Australia
Tax open years subject to examination [Line Items]
Open Tax Year	2017
Belgium
Tax open years subject to examination [Line Items]
Open Tax Year	2015
Canada
Tax open years subject to examination [Line Items]
Open Tax Year	2013
Netherlands
Tax open years subject to examination [Line Items]
Open Tax Year	2012
Switzerland
Tax open years subject to examination [Line Items]
Open Tax Year	2013
United Kingdom
Tax open years subject to examination [Line Items]
Open Tax Year	2017
Jurisdictions in Asia
Tax open years subject to examination [Line Items]
Open Tax Year	2018
Minimum
Tax open years subject to examination [Line Items]
Possible decrease of unrecognized tax benefits	$ 0
Maximum
Tax open years subject to examination [Line Items]
Possible decrease of unrecognized tax benefits	$ 180,000