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COMMITMENTS AND CONTINGENCIES (Royalty Commitments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Long-term Purchase Commitment [Line Items]      
Proceeds from grants received $ 215 $ 55 $ 150
OCS [Member]      
Long-term Purchase Commitment [Line Items]      
Royalty rates 3.50%    
Percent of grants received paid in royalties 100.00%    
Total commitment with respect to royalty-bearing participation received, net of royalties paid $ 40,693    
Proceeds from grants received 38,442    
Accumulated interest, grants 13,995    
Accumulated royalties paid 11,744    
Royalty expenses $ 655 $ 827 $ 706
BIRD-F [Member]      
Long-term Purchase Commitment [Line Items]      
Royalty rates 5.00%    
Percent of grants received paid in royalties 150.00%    
Proceeds from grants received $ 359    
Royalties due based on stated percentage 798    
Linkage to the United States Consumer Price Index 439    
Accumulated royalties paid $ 359    
MOE [Member]      
Long-term Purchase Commitment [Line Items]      
Royalty rates 3.00%    
Proceeds from grants received $ 523    
Maximum term for required royalty payments 5 years