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CONVERTIBLE NOTES - Additional information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 07, 2016 | Jun. 30, 2018 | Jul. 24, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 02, 2016 | Sep. 18, 2013
Net proceeds from issuance of convertible notes |  |  | $ 9,500,000 |  |  | $ 9,542,000 |  |
Debt Conversion, Converted Instrument, Shares Issued | 2,384,673 |  |  |  | 1,123,964 |  |  |
Repayments of Convertible Debt |  |  |  | $ 0 | $ 4,752,000 | 10,961,000 |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  |  |  | $ 0 | $ 0 | $ (38,061,000) |  |
Convertible Notes Payable [Member] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 69,000,000
2021 Notes [Member] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 10,000,000 |  |  |  | $ 22,500,000 |
Number of shares for basis conversion |  |  |  |  |  | 117.64706 |  |
Interest rate |  |  |  | 7.50% |  |  | 7.50% |
Conversion price per share |  |  |  | $ 8.50 |  |  |  |
Base value for conversion rate |  |  |  | $ 1,000 |  |  |  |
Minimum Cash Balance required to be maintained |  |  |  | 7,500,000 |  |  |  |
Maximum Debt Instrument Convertible Conversion Share Number |  |  |  |  |  | 178.7310 |  |
Debt Instrument Maturity Year |  |  | 2021 |  |  |  |  |
4.5% Convertible Notes [Member] |  |  |  |  |  |  |  |
Principal amount |  | $ 3,423,000 | $ 9,000,000 |  |  | $ 54,100,000 |  |
Debt Conversion Converted Instrument Amount, Cash |  | $ 2,230,000 |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 261,363 |  |  |  |  |  |
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%
2021 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Description |  |  |  |  | Prior to the maturity date, the Company may redeem in cash: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, orall 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 |  |  |  |  | 153,742 |  |  |
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% |  |  |  |  |
Repayments of Convertible Debt |  |  | $ 275,000 |  |  |  |  |
Debt Instrument Maturity Year |  |  | 2022 |  |  |  |  |
Four Point Five Percentage Convertible Notes 2018 [Member] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 9,000,000 |  |  |  |  |

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