STOCK BASED COMPENSATION, RESTRICTED STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation
Stock-based compensation (in dollars)	$ 618	$ 4,100
Restricted Stock Units (RSUs)
Number of Grants
Unvested balance at	20,000
Granted (in shares)		23,800
Vested/Released (in shares)	(4,250)
Forfeited (in shares)	(5,500)	(3,800)
Unvested balance at	10,250	20,000
Weighted-Average Grant Date Fair Value
Unvested balance at (in dollars per share)	$ 25.70
Granted (in dollars per share)		$ 26.50
Vested (in dollars per share)	24.72
Forfeited (in dollars per share)	31.25	31.25
Unvested balance at (in dollars per share)	$ 23.13	$ 25.70
Share-based compensation
Stock-based compensation (in dollars)	$ 88
Unrecognized compensation
Total unrecognized compensation expense	$ 223
Period for unrecognized compensation expense is estimated to be recognized	2 years 8 months 5 days