Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFITS (Details)

v3.8.0.1
EMPLOYEE BENEFITS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
EMPLOYEE BENEFITS [Abstract]      
Employer matching contribution up to first 3% 100.00%    
Employee contribution threshold for matching percentage 3.00%    
Employer matching contribution in excess of first 3% 50.00%    
Maximum employer matching contribution 5.00%    
Employer contributions $ 684 $ 673 $ 665
Number of shares of common stock reserved to be issued under Employee Stock Purchase Plan (in shares) 210,000