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INCOME TAXES - Tax Summary of Stockholder Rights Plan (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 13, 2013 item $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Rights Plan |  |  |  |
Annual limitation on net operating losses |  | $ 14,284 |  |
Unrecognized tax benefits |  |  | $ 1 | $ 27
Unrecognized tax benefits, including accrued interest and penalties |  |  | 1 |
Accrued interest or penalties related to uncertain tax positions recognized |  | 0 | $ 1 |
Favorable Tax Impact Member |  |  |  |
Rights Plan |  |  |  |
Unrecognized tax benefits, including accrued interest and penalties |  | $ 0 |  |
Series A Junior Participating Preferred Stock |  |  |  |
Rights Plan |  |  |  |
Number of rights for each outstanding share of common stock | item | 1 |  |  |
Number of preferred share purchase rights for each outstanding share of the company's common stock | shares | 0.001 |  |  |
Exercise price (in dollars per right) | $ / shares | $ 4.25 |  |  |
Series A Junior Participating Preferred Stock | Minimum |  |  |  |
Rights Plan |  |  |  |
Threshold percentage of beneficial ownership for significant dilution of ownership interest | 4.90% |  |  |
Current beneficial ownership percentage that will not trigger the preferred share purchase rights unless they acquire additional shares | 4.90% |  |  |
Series A Junior Participating Preferred Stock | Maximum |  |  |  |
Rights Plan |  |  |  |
Beneficial ownership percentage of any person or group, together with its affiliates and associates | 4.90% |  |  |

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- Definition Subsequent to the adoption of a shareholders rights plan, this value represents the threshold percentage of beneficial ownership of common stock acquired by any person or group without approval of the board of directors, or additional shares acquired by any shareholder already holding such percentage of common stock, upon which a preferred share purchase rights offering would occur, which would significantly dilute the ownership of the acquirer. + References No definition available. + Details
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