STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Allocated Share-based Compensation Expense	$ 1,772	$ 1,462	[1]	$ 4,896	$ 4,612
Cost of Sales [Member] | 2008 Plan [Member]
Allocated Share-based Compensation Expense	24	19		66	68
Research and Development Expense [Member] | 2008 Plan [Member]
Allocated Share-based Compensation Expense	184	173		564	485
Selling, General and Administrative Expenses [Member] | 2008 Plan [Member]
Allocated Share-based Compensation Expense	$ 1,564	$ 1,270		$ 4,266	$ 4,059

[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.