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COMMITMENTS AND CONTINGENCIES (Royalty Commitments) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]    
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 $ 43,247  
Royalty expenses $ 594 $ 481