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CONVERTIBLE NOTES (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 07, 2016 | Dec. 31, 2016 | Sep. 19, 2016 | Sep. 18, 2013 | Dec. 31, 2016 | Dec. 31, 2014
Number of shares for basis conversion |  |  |  | 173.6593 |  |
Net proceeds from issuance of convertible notes |  |  |  | $ 66,800,000 | $ 19,681,000 |
Principal amount, related to the initial purchaser's over-allotment option |  |  |  | 9,000,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ 14,063,000 |
Percentage Of Excess Shares Outstanding |  |  |  |  | 20.00% |
Debt Conversion, Converted Instrument, Shares Issued | 23,846,735 |  |  |  |  |
Convertible Notes Payable [Member] |  |  |  |  |  |
Principal amount |  |  |  | $ 69,000,000 |  |
Seven Point Five Percentage Convertible Notes [Member] |  |  |  |  |  |
Principal amount |  | $ 22,500,000 |  |  | $ 22,500,000 |
Net proceeds from issuance of convertible notes |  | $ 19,700,000 |  |  |  |
Maturity |  | Nov. 15, 2021 |  |  |  |
Interest rate |  | 7.50% |  |  | 7.50% |
Conversion price per share |  | $ 0.85 |  |  | $ 0.85 |
Base value for conversion rate |  | $ 1,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 14,063,000 |  |  |  |
Maximum Debt Instrument Convertible Conversion Share Number |  | $ 1,787.3100 |  |  |  |
Debt Instrument, Redemption, Description |  | Prior to the maturity date, the Company may redeem in cash: a) any or all of the 2016 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 2016 Notes then outstanding if the aggregate principal amount of the 2016 Notes then outstanding is less than 15% of the aggregate principal amount of the notes issued. |  |  |  |
Four Point Five Percentage Convertible Notes [Member] |  |  |  |  |  |
Principal amount |  | $ 14,948,000 |  |  | $ 14,948,000 |
Interest rate | 4.50% |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | $ 54,052,000 |  |  |  | $ 54,052,000 |
Debt Instrument, Redemption, Description |  |  | On or after September 19, 2016, the Company may redeem for cash all or part of the 2013 Notes (except for the notes that the Company is then required to repurchase in connection with a fundamental change) if the last reported sale price of the Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading-day period ending on the trading day immediately preceding the date on which the Company provides the notice of redemption. |  |  |
Convertible Notes Due Two Thousand Twenty One [Member] |  |  |  |  |  |
Principal amount | 40,186,000 |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | $ 40,186,000 |  |  |  |  |
Convertible Notes 2013 [Member] |  |  |  |  |  |
Interest rate |  |  |  | 4.50% |  |
Conversion price per share |  |  |  | $ 5.76 |  |

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