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COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Rental Commitments Under Operating Leases
Annual minimum future rental commitments under non-cancelable operating leases are approximately as follows:

December 31,
     
       
2018
 
$
1,671
 
2019
   
1,696
 
2020
   
1,655
 
2021
   
415
 
         
   
$
5,437