INCOME TAX PROVISION Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Operating Loss Carryforwards [Line Items]
Net deferred liabilities		$ 13,955	$ 19,367
Tax credits		1,215	$ 1,665
Net operating loss limited under section 382		2,300
Deferred tax liability related to TCJA	$ 12,400
Income tax benefit related to TCJA	$ 6,000
Adjustment to valuation allowance		(100)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss		167,700
Tax credits		1,500
State
Operating Loss Carryforwards [Line Items]
Operating loss		178,700
Tax credits		100
Sensage
Operating Loss Carryforwards [Line Items]
Operating loss		$ 47,700
Valuation Allowance of Deferred Tax Assets [Member] | Accounting Standards Update 2016-09 [Member]
Operating Loss Carryforwards [Line Items]
Cumulative effect of adoption of ASU 2016-09				$ 500