STOCK BASED COMPENSATION, RESTRICTED STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share-based compensation
Stock-based compensation (in dollars)	$ 67	$ 306
Restricted Stock Units (RSUs)
Number of Grants
Unvested balance at	10,250
Vested/Released (in shares)	(750)
Unvested balance at	9,500
Weighted-Average Grant Date Fair Value
Unvested balance at (in dollars per share)	$ 23.13
Vested (in dollars per share)	22.00
Unvested balance at (in dollars per share)	$ 23.22
Share-based compensation
Stock-based compensation (in dollars)	$ 26
Unrecognized compensation
Total unrecognized compensation expense	$ 197
Period for unrecognized compensation expense is estimated to be recognized	2 years 6 months 4 days

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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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