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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) $ in Thousands					3 Months Ended			12 Months Ended
	Feb. 12, 2019 USD ($) shares	Jan. 29, 2019 USD ($) installment shares	Jan. 15, 2019 USD ($)	Feb. 09, 2018 shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares
Debt Instrument [Line Items]
Payments on notes					$ 109		$ 116
Conversion of convertible debt plus interest into common stock	$ 1,900					$ 200
Number of shares converted from debt instrument (in shares) | shares	120,983					93,333
Long-term debt, net of current maturities					238	$ 253		$ 253
Proceeds from issuance of common stock					1,726		$ 618
Proceeds from issuance of debt					250
Crede Note
Debt Instrument [Line Items]
Payments on notes					0
Conversion of convertible debt plus interest into common stock					0
Issuance of convertible notes			$ 1,450
Conversion price based on closing bid price of common stock on the date prior to each conversion date (as a percent)			90.00%
Proceeds from issuance of common stock			$ 4,000
Beneficial Ownership Cap			4.99%
Leviston Resources LLC
Debt Instrument [Line Items]
Conversion of convertible debt plus interest into common stock					$ 200
Number of shares converted from debt instrument (in shares) | shares					73,333			0
Long-term debt, net of current maturities					$ 500
Beneficial Ownership Cap		4.99%
New shares issued (in shares) | shares		10,000		48,076
Percentage of daily average composite trading volume		10.00%
Settled Litigation | Crede Note
Debt Instrument [Line Items]
Issuance of convertible notes			$ 1,450
Settled Litigation | Leviston Resources LLC
Debt Instrument [Line Items]
Issuance of convertible notes		$ 700
Number of equal monthly installments | installment		14
Maximum | Crede Note
Debt Instrument [Line Items]
New shares issued (in shares) | shares					10,000
Percentage of daily average composite trading volume					10.00%
Maximum | Leviston Resources LLC
Debt Instrument [Line Items]
Payments on notes					$ 100
Minimum | Settled Litigation
Debt Instrument [Line Items]
Proceeds from issuance of common stock		$ 4,000

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