RELATED PARTY TRANSACTIONS (Schedule of Related Party Transactions) (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 23, 2017	Feb. 29, 2016
Related Party Transaction [Line Items]
Accounts payable	$ 6,000		$ 173,000
Notes Payable, Related Parties				$ 129,000.0
Director [Member]
Related Party Transaction [Line Items]
Accounts payable	0		50,000
Expenses	111,000	$ 124,000
K and R, LLC [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Deposits (included in other long-term assets)	42,000		42,000
Notes Payable, Related Parties	1,568,000		1,600,000		$ 1,500,000
Accrued interest	6,000		0
K and R, LLC [Member] | Affiliated Entity [Member] | Prepaid expenses [Member]
Related Party Transaction [Line Items]
Expenses	0		43,000
K and R, LLC [Member] | Affiliated Entity [Member] | Accrued rent payable
Related Party Transaction [Line Items]
Related party payables	0		123,000
K and R, LLC [Member] | Affiliated Entity [Member] | Rent expense (property)
Related Party Transaction [Line Items]
Expenses	225,000	323,000
K and R, LLC [Member] | Affiliated Entity [Member] | Interest expense [Member]
Related Party Transaction [Line Items]
Expenses	38,000	38,000
Affiliated Entity, LK Property Investments, LLC [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Deposits (included in other long-term assets)	3,000		3,000
Affiliated Entity, LK Property Investments, LLC [Member] | Affiliated Entity [Member] | Prepaid expenses [Member]
Related Party Transaction [Line Items]
Expenses	3,000		3,000
Affiliated Entity, LK Property Investments, LLC [Member] | Affiliated Entity [Member] | Rent expense (property)
Related Party Transaction [Line Items]
Expenses	18,000	18,000
MetalX, LLC [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts receivable	0		$ 1,000
Revenue from product sales & services	$ 0	$ 188,000