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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of options (in shares) | 2,028,847 |  | 2,028,847 |  | 2,045,143 | 2,122,897
Outstanding options, weighted average exercise price (in dollars per share) | $ 4.49 |  | $ 4.49 |  | $ 5.69 | $ 6.54
Number of grants in period, net of forfeitures (in shares) |  |  | 738,893 |  | 449,537 |
Share-based compensation | $ 830,000 | $ 580,000 | $ 2,620,000 | $ 1,690,000 |  |
Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 7,912,149 |  | 7,912,149 |  |  |
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 10 months 6 days |  |  |
Number of grants in period (in shares) |  |  | 740,000 | 450,000 |  |
Number of options (in shares) | 2,030,000 |  | 2,030,000 |  |  |
Number of exercisable options (in shares) | 1,660,000 |  | 1,660,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 4.49 |  | $ 4.49 |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 4.96 |  | $ 4.96 |  |  |
Options, vested and expected to Vest, aggregate intrinsic value | $ 0 |  | $ 0 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Number of grants in period, net of forfeitures (in shares) |  |  | 1,390,000 | 1,210,000 |  |
Grants in period, grant date intrinsic value (in dollars per share) |  |  | $ 1,640,000 | $ 300,000 |  |
Unrecognized compensation costs related to unvested stock options |  |  | $ 200,000 |  |  |
Unrecognized compensation costs related to RSU awards |  |  | $ 2,010,000 |  |  |
Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition |  |  | 2 years |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 15.61 |  | $ 15.61 |  | $ 15.61 | $ 32.10
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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