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STOCK-BASED COMPENSATION (Details Narrative) - USD ($) |  | 1 Months Ended | 12 Months Ended | 152 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 18, 2007 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Feb. 28, 2015 | May 31, 2014 | Dec. 31, 2013
Average share price (in dollars per share) |  |  | $ 3.82 | $ 2.01 |  |  |  |
Unrecognized pre-tax non-cash compensation expense to non-vested option |  |  | $ 3,699,000 |  | $ 3,699,000 |  |  |
Period unrecognized pre-tax non-cash compensation expense to non-vested option |  |  | 3 years |  |  |  |  |
Number of shares vested |  |  | 4,600,000 |  |  |  |  |
Number of shares exercised |  |  | 2,007,221 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
Stock Incentive Plan [Member] |  |  |  |  |  |  |  |
Plan expiration term | 10 years |  |  |  |  |  |  |
Number of shares authorized | 2,500,000 | 5,100,000 |  |  |  | 4,600,000 | 4,250,000 | 3,500,000
Stock Incentive Plan 2015 [Member] |  |  |  |  |  |  |  |
Number of shares authorized |  | 5,000,000 |  |  |  |  |  |
Description of plan |  | Provision for an annual increase of 15% to the shares included under the plan, with the shares to be added on the first day of each calendar year, beginning on January 1, 2016. |  |  |  |  |  |
Purchase of common shares |  |  | 1,200,000 | 1,300,000 | 5,600,000 |  |  |
Average share price (in dollars per share) |  |  |  |  | $ 1.04 |  |  |
Fair value of common shares purchased |  |  |  |  | $ 7,300,000 |  |  |
General And Administrative Expense [Member] |  |  |  |  |  |  |  |
Non-cash compensation expense |  |  | $ 2,200,000 | $ 1,600,000 |  |  |  |

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