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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - 2015 EIP Plan - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 15, 2019 | Mar. 04, 2019 | May 15, 2018 | Feb. 27, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Stock Awards |  |  |  |  |  |  |  |  |
Number of common shares outstanding in respect of RSUs |  |  |  |  | 228,781 |  | 228,781 |  | 216,304
Number of Shares |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  | 149,170 |  |
Granted (in shares) | 29,580 | 106,079 | 14,268 | 37,346 |  |  | 135,659 |  |
Vested (in shares) |  |  |  |  |  |  | (26,745) |  |
Balance at the end of the period (in shares) |  |  |  |  | 258,084 |  | 258,084 |  |
Weighted Average Fair Value |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  | $ 12.42 |  |
Granted (in dollars per share) |  |  |  |  |  |  | 8.44 |  |
Vested (in dollars per share) |  |  |  |  |  |  | 15.92 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  | $ 9.96 |  | $ 9.96 |  |
Weighted-average remaining contractual life |  |  |  |  |  |  | 1 year 5 months 19 days |  |
Additional disclosures |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  |  |  |  | $ 230 | $ 450 |
Unrecognized compensation cost related to nonvested stock awards |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 1,209 |  | $ 1,209 |  |
Weighted-average period for recognition of unrecognized compensation cost |  |  |  |  |  |  | 1 year 5 months 19 days |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |
Recognized nonvested stock amortization expense |  |  |  |  | $ 340 | $ 421 | $ 610 | $ 788 |
Vested RSUs |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  | 320,980 |  | 320,980 |  |
Weighted Average Fair Value |  |  |  |  |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  | $ 11.59 |  |
Other Individuals |  |  |  |  |  |  |  |  |
Stock Awards |  |  |  |  |  |  |  |  |
Vesting period of awards |  |  |  |  |  |  | 3 years |  |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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