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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and contingencies          
Long-term lease obligations     $ 3,468 $ 2,588  
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     3,468 2,588  
Rent expense     1,808 $ 1,808 $ 1,808
Future minimum rental payments          
2019     2,230    
2020     2,230    
2021     2,230    
2022     2,230    
2023     2,378    
Remaining term of the lease     4,292    
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