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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - Restricted Stock Units $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
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May 17, 2017 shares | Feb. 17, 2016 item shares | Sep. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($)
Directors |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) | 25,197 |  |  |  |  |  |
2015 EIP Plan |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  | 66,666 |
Granted (in shares) |  |  |  |  |  | 317,595 |
Vested (in shares) |  | (2,328) |  |  |  | (66,666) |
Balance at the end of the period (in shares) |  |  | 317,595 | 66,666 |  | 317,595 |
Number of resignations from the Board of Directors | item |  | 2 |  |  |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.10 |
Granted (in dollars per share) | $ / shares |  |  |  |  |  | 11.05 |
Vested (in dollars per share) | $ / shares |  |  |  |  |  | 5.10 |
Balance at the end of the period (in dollars per share) | $ / shares |  |  | $ 11.05 | $ 5.10 |  | $ 11.05 |
Weighted-average remaining contractual life |  |  |  |  |  | 1 year 11 months 5 days |
Additional disclosures |  |  |  |  |  |  |
Total fair value of shares vested | $ |  |  |  |  |  | $ 675 | $ 30
Unrecognized compensation cost related to nonvested stock awards |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  | $ 1,815 |  |  | $ 1,815 |
Weighted-average period for recognition of unrecognized compensation cost |  |  |  |  |  | 1 year 11 months 5 days |
2015 EIP Plan | General and Administrative Expense. |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Recognized nonvested stock amortization expense | $ |  |  | $ 830 |  | $ 86 | $ 1,822 | $ 320
2015 EIP Plan | Vested RSUs |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Number of shares vested |  |  | 74,106 |  |  | 74,106 |
Weighted Average Fair Value |  |  |  |  |  |  |
Vested (in dollars per share) | $ / shares |  |  |  |  |  | $ 11.73 |
2015 EIP Plan | Directors |  |  |  |  |  |  |
Stock Awards |  |  |  |  |  |  |
Vesting period of awards |  |  |  |  |  | 3 years |
Number of Shares |  |  |  |  |  |  |
Number of common shares outstanding in respect of RSUs |  |  | 21,372 | 3,138 |  | 21,372 |
2015 EIP Plan | Eugene Davis |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Number of common shares issued in respect of RSUs | 18,234 |  |  |  |  |  |

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