STOCK OPTIONS - SUMMARY OF STOCK OPTIONS (Details) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | ||
| Outstanding, beginning of period (in shares) | 3,131,447 | 2,864,189 |
| Granted (in shares) | 810,762 | 830,922 |
| Exercised (in shares) | (36,250) | (97,500) |
| Cancelled and forfeited (in shares) | (153,750) | (466,164) |
| Outstanding, end of period (in shares) | 3,752,209 | 3,131,447 |
| Exercisable, end of period (in shares) | 2,006,702 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | ||
| Outstanding, beginning of period (in dollars per share) | $ 3.38 | $ 3.69 |
| Granted (in dollars per share) | 1.87 | 2.21 |
| Exercised (in dollars per share) | 3.62 | 2.25 |
| Cancelled and forfeited (in dollars per share) | 3.69 | 3.57 |
| Outstanding, end of period (in dollars per share) | 3.04 | $ 3.38 |
| Exercisable, end of period (in dollars per share) | $ 3.79 | |