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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of options (in shares) | 2,680,463 |  | 2,045,143 | 2,122,897
Outstanding options, weighted average exercise price (in dollars per share) | $ 4.67 |  | $ 5.69 | $ 6.54
Number of grants in period, net of forfeitures (in shares) | 732,328 |  | 449,537 |
Share-based compensation | $ 1,041,000 | $ 667,000 |  |
Number of exercises in period (in shares) | 0 |  | 8,369 |
Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 4,504,598 |  |  |
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 9 months 22 days |  |  |
Number of grants in period (in shares) | 730,000 | 420,000 |  |
Number of options (in shares) | 2,680,000 |  |  |
Number of exercisable options (in shares) | 2,210,000 |  |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ 4.67 |  |  |
Exercisable options, weighted average exercise price (in dollars per share) | $ 5.16 |  |  |
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] |  |  |  |
Number of grants in period, net of forfeitures (in shares) | 1,130,000 | 950,000 |  |
Grants in period, grant date intrinsic value (in dollars per share) | $ 1,640,620.00 | $ 302,170.00 |  |
Unrecognized compensation costs related to unvested stock options | $ 410,000 |  |  |
Unrecognized compensation costs related to RSU awards | $ 3,100,000 |  |  |
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 | $ 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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