OTHER CURRENT ASSETS AND LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 1,879	$ 2,287
Deposits and other receivables	759	551
Interest receivables	183	237
Other current assets	2,821	3,075
Other Assets, Noncurrent [Abstract]
Deposits paid for research and development	$ 3,300	$ 2,000