OTHER CURRENT ASSETS AND LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 2,287	$ 1,827
Refundable research and development tax credits	0	809
Deposits and other receivables	551	622
Interest receivables	237	96
Other current assets	3,075	3,354
Other Assets, Noncurrent [Abstract]
Deposits paid for research and development	$ 2,000	$ 300