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STOCK-BASED COMPENSATION (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 1,772 $ 1,462 [1] $ 4,896 $ 4,612  
Treasury Stock, Common, Value $ 659   $ 659   $ 259
Treasury Stock, Common, Shares 11,179   11,179   5,203
2008 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 600,000   600,000    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 200,000   200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date     15.00%    
Employee Stock Purchase Plan [Member] | Cost of Sales [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 2 1 $ 6 5  
Employee Stock Purchase Plan [Member] | Research and Development Expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 5   8    
Employee Stock Purchase Plan [Member] | Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 15 $ 11 $ 43 $ 50  
[1] Includes 11 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $659 thousand total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.