CONVERTIBLE NOTES (Narrative) (Details) - USD ($)		1 Months Ended			12 Months Ended
	Dec. 07, 2016	Jun. 30, 2018	Jul. 24, 2017	Apr. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 02, 2016	Sep. 18, 2013
Number of shares for basis conversion									173.6593
Net proceeds from issuance of convertible notes			$ 9,500,000			$ 9,542,000	$ 19,681,000
Principal amount, related to the initial purchaser's over-allotment option									$ 9,000,000
Debt Conversion, Converted Instrument, Amount					$ 2,285,000	16,263,000
Gain (Loss) on Extinguishment of Debt						$ (1,325,000)	14,063,000
Percentage Of Excess Shares Outstanding					20.00%
Debt Conversion, Converted Instrument, Shares Issued	23,846,735					11,239,641
Repayments of Convertible Debt					$ 4,752,000	$ 10,961,000
Stockholders Approval Description For Common Stock Issuance				the issuance of shares in excess of 20% of its outstanding shares. On April 12, 2017, the Company’s stockholders approved the issuance of shares of the Company’s Common Stock in excess of 20% of the Company’s outstanding shares of Common Stock to settle conversion requests and pay interest on the Company’s issued 2021 Notes
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net						(38,061,000)	$ (6,473,000)
Convertible Notes Payable [Member]
Principal amount									$ 69,000,000
Seven Point Five Percentage Convertible Notes [Member]
Principal amount			$ 10,000,000					$ 22,500,000
Interest rate					7.50%			7.50%
Conversion price per share					$ 0.85
Base value for conversion rate					$ 1,000	$ 1,000
Gain (Loss) on Extinguishment of Debt					$ 14,100,000
Maximum Debt Instrument Convertible Conversion Share Number							$ 1,787.3100
Debt Conversion, Converted Instrument, Shares Issued							1,176.4706
Debt Instrument Maturity Year			2021 years
4.5% Convertible Notes [Member]
Principal amount		$ 3,423,000	$ 9,000,000				$ 54,100,000
Debt Conversion, Converted Instrument, Amount		$ 2,230,000
Debt Conversion, Converted Instrument, Shares Issued		2,613,636
Repayments of Convertible Debt		$ 2,530,000
Convertible Notes Due Two Thousand Twenty One [Member]
Principal amount	$ 40,186,000
Convertible Notes 2013 [Member]
Interest rate									4.50%
Conversion price per share									$ 5.76
Seven Point Five Percentage Convertible Notes 2021 [Member]
Debt Instrument, Redemption, Description						Prior to the maturity date, the Company may redeem in cash: a) any or all of the 2021 Notes if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days exceeds 150% of the conversion price on each applicable trading day, or b) all of the 2021 Notes then outstanding if the aggregate principal amount of the 2021 Notes then outstanding is less than 15% of the aggregate principal amount of the notes issued.
Debt Conversion, Converted Instrument, Shares Issued					1,537,415
Repayments of Convertible Debt					$ 15,887
Long-term Debt, Gross					57,900,000
Debt Conversion, Original Debt, Amount					$ 1,150,000
Four Point Five Percentage Convertible Notes 2022 [Member]
Principal amount			$ 8,550,000
Maturity							Nov. 15, 2021
Interest rate			4.50%
Gain (Loss) on Extinguishment of Debt						$ (1,300,000)
Repayments of Convertible Debt			$ 275,000
Debt Instrument Maturity Year			2022 years
Four Point Five Percentage Convertible Notes 2018 [Member]
Principal amount			$ 9,000,000