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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 04, 2011
Sep. 30, 2005
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and contingencies          
Long-term lease obligations     $ 2,588 $ 1,868  
Lease agreement entered into September 2005          
Commitments and contingencies          
Lease term   15 years      
Gain related to previous lease liability settlement, included in rent expense       (116)  
Lease agreement entered into April 2011          
Commitments and contingencies          
Lease term 7 years        
Obligation of sublessor towards the cost of alterations of office space $ 472        
Long-term lease obligations     2,588 1,868  
Rent expense     1,808 $ 1,808 $ 1,808
Future minimum rental payments          
2018     916    
2019     2,230    
2020     2,230    
2021     2,230    
2022     2,230    
Remaining term of the lease     6,671    
Lease agreement entered into April 2011 | Period from October 1, 2018 to April 30, 2023          
Commitments and contingencies          
Monthly rental payment     186    
Lease agreement entered into April 2011 | Period from May 1, 2023 to September 30, 2025          
Commitments and contingencies          
Monthly rental payment     204    
Lease agreement entered into April 2011 | Period During July 9, 2014 To September 30, 2025          
Commitments and contingencies          
Monthly straight-line rental expense     150    
Sub Sublease Agreement | Period November 1, 2011 until May 31, 2015          
Commitments and contingencies          
Monthly rental payment     82    
Sub Sublease Agreement | Period after May 31, 2015 until April 30, 2018          
Commitments and contingencies          
Monthly rental payment     $ 90