Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION. (Details 3)

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STOCK-BASED COMPENSATION. (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total stock-based compensation expense $ 3,828 $ 2,616 $ 2,019
Employees [Member]      
Total stock-based compensation expense 3,303 2,173 1,694
Non-Employees [Member]      
Total stock-based compensation expense $ 525 $ 443 $ 325