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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 |  |  |  |  |  |

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