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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted in period (in shares) |  |  | 738,893 | 449,537 | 2,176,330 |
Number of options (in shares) | 2,045,143 | 2,122,897 | 2,028,847 | 2,045,143 | 2,122,897 | 905,413
Outstanding options, weighted average exercise price (in dollars per share) | $ 5.69 | $ 6.54 | $ 4.48 | $ 5.69 | $ 6.54 | $ 11.66
Number of exercises in period (in shares) |  |  | 0 | 8,369 | 48,802 |
Shares issued for consulting services |  |  | $ 370,000 | $ 18,000 | $ 185,000 |
Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 7,436,682.4 |  |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 2 years |  |  |
Award exercise period |  |  | 5 years |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 3 years 7 months 1 day |  |  |
Stock options granted in period (in shares) |  |  | 740,000 | 450,000 |  |
Number of options (in shares) |  |  | 2,030,000 |  |  |
Number of exercisable options (in shares) |  |  | 1,660,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | 4.96 |  | $ 4.48 | $ 4.96 |  |
Options, vested and expected to Vest, aggregate intrinsic value |  |  | $ 0 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Number of RSUs granted in period (in shares) |  |  | 1,390,000 | 1,210,000 | 280,000 |
Exercisable options, weighted average exercise price (in dollars per share) | 2.12 | 3.87 |  | $ 2.12 | $ 3.87 |
Grants in period, grant date intrinsic value (in dollars per share) | $ 1,690,000 | $ 302,165 |  |  |  |
Unrecognized compensation costs related to unvested stock options |  |  | $ 110,000 |  |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 1,260,000 |  |  |
Number of exercises in period (in shares) |  |  |  | 8,369 | 48,802 |
Shares issued for consulting services |  |  |  | $ 20,000 | $ 180,000 |
Exercisable options, intrinsic value | $ 10,000 | $ 60,000 |  | $ 10,000 | $ 60,000 |
Maximum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercisable options, weighted average remaining contractual term |  |  | 10 years |  |  |

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