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RELATED PARTY TRANSACTIONS (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Lease liability $ 9,345   $ 9,345    
Right of use asset 7,659   7,659   $ 0
Shared Services Agreement [Member]          
Costs and expenses, related party 200 $ 800 400 $ 1,100  
Collaboration Agreement [Member]          
Costs and expenses, related party $ 1,100 $ 200 1,400 $ 500  
Upfront Fee     $ 1,000    
Office Agreement [Member]          
Percentage of occupancy 450.00%   450.00%    
Operating lease, initial commitment period     15 years    
Average annual rental payments $ 1,100   $ 1,100    
Lease liability 9,300   9,300    
Right of use asset 7,700   7,700    
Line of credit 600   600    
Additional collateral pledged $ 600   $ 600