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RELATED PARTY TRANSACTIONS (Details Narrative)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
ft²
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]      
Other research and development $ 30,896 $ 32,159  
Lease liability 9,443   $ 0
Right-of-use asset $ 7,947   $ 0
Office Agreement [Member]      
Related Party Transaction [Line Items]      
Percentage of occupancy 45.00%    
Area of land | ft² 24,000    
Average annual rental payments $ 1,100    
Operating lease, initial commitment period 15 years    
Lease liability $ 9,400    
Right-of-use asset 7,900    
Line of credit 600    
Additional collateral pledged 600    
Shared Services Agreement [Member]      
Related Party Transaction [Line Items]      
Costs and expenses, related party 200 400  
Collaboration Agreement [Member]      
Related Party Transaction [Line Items]      
Costs and expenses, related party $ 300 $ 0