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STOCK-BASED COMPENSATION - Additional Information - Restricted stock (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
STOCK OPTION PLANS AND RESTRICTED STOCK |  |  |  |
Compensation expense |  | $ 329,000 | $ 43,000 | $ 12,000
Unrecognized compensation expense |  | $ 6,200,000 |  |
Weighted average period |  | 3 years 1 month 6 days |  |
Restricted Stock |  |  |  |
STOCK OPTION PLANS AND RESTRICTED STOCK |  |  |  |
Number of shares underlying restricted stock unvested |  | 212,580 |  |
Number of shares underlying restricted stock outstanding |  | 212,580 |  |
Weighted-average grant date fair value per share unvested |  | $ 27.27 |  |
Weighted-average grant date fair value per share unvested outstanding |  | $ 27.27 |  |
Aggregate grant date fair value unvested |  | $ 5,797,000 |  |
Aggregate grant date fair value outstanding |  | $ 5,797,000 |  |
Weighted-average contractual term unvested (years) |  | 4 years 4 months 24 days |  |
Weighted-average contractual term outstanding (years) |  | 4 years 4 months 24 days |  |
Directors, executive officers and key employees | 2017 Plan | Restricted Stock |  |  |  |
STOCK OPTION PLANS AND RESTRICTED STOCK |  |  |  |
Number of shares of restricted stock granted | 212,580 |  |  |
Accrued dividends payable |  | $ 11,000 |  |
Directors | 2017 Plan | Restricted Stock |  |  |  |
STOCK OPTION PLANS AND RESTRICTED STOCK |  |  |  |
Vesting period | 2 years |  |  |
Executive officers and employees | 2017 Plan | Restricted Stock |  |  |  |
STOCK OPTION PLANS AND RESTRICTED STOCK |  |  |  |
Vesting period | 5 years |  |  |

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- Definition Weighted average remaining contractual term for unvested portions of equity-based awards excluding options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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