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OPERATING LEASES (Details) - USD ($)
Mar. 10, 2020
Sep. 10, 2019
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Oct. 31, 2019
Oct. 01, 2019
Apr. 30, 2019
Lessee Lease Description [Line Items]                
Operating Lease, Right-of-Use Asset     $ 5,295,000   $ 2,497,000      
Operating Lease, Liability     $ 5,677,000          
Menlo Park Office Space Lease                
Lessee Lease Description [Line Items]                
Operating lease term, additional period extension   2 months            
Operating Lease, Percentage of Discount Rate       5.00%        
Operating Lease, Right-of-Use Asset       $ 149,000        
Operating Lease, Liability       $ 149,000        
New Jersey Office Space Lease                
Lessee Lease Description [Line Items]                
Operating Lease, Percentage of Discount Rate             8.00%  
Operating Lease, Right-of-Use Asset             $ 2,356,000  
Operating Lease, Liability             $ 2,356,000  
Operating lease, initial term               11 years
Operating lease term, option to extend additional period               5 years
Operating lease,remaining lease term     9 years 9 months 18 days          
Foster City Office Space Lease                
Lessee Lease Description [Line Items]                
Operating Lease, Percentage of Discount Rate 7.00%              
Operating Lease, Right-of-Use Asset $ 3,426,000              
Operating Lease, Liability $ 3,426,000              
Operating lease, initial term 87 months         87 months    
Operating lease term, option to extend additional period           5 years    
Operating lease,remaining lease term     6 years 6 months          
Operating lease, rent abatement period 3 months