COMMITMENTS AND CONTINGENCIES (Details)	1 Months Ended
	Dec. 31, 2014 defendant patent	Mar. 31, 2018 USD ($) lawsuit	Jul. 31, 2007 death
Quest Integrity
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon | patent	3
Number of defendants	3
Con Ed Matter
Loss Contingencies [Line Items]
Number of deaths | death			1
Number of lawsuits | lawsuit		83
Insurance coverage subject to deductible limit | $		$ 250,000
Delaware Cases | Quest Integrity
Loss Contingencies [Line Items]
Number of defendants	2
Washington Case | Quest Integrity
Loss Contingencies [Line Items]
Number of defendants	1
Con Ed Matter
Loss Contingencies [Line Items]
Liability accrual in excess of the deductible limit for the lawsuits | $		$ 0