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OPERATING LEASES (Details) - USD ($)
Mar. 10, 2020
Oct. 01, 2019
Sep. 10, 2019
Mar. 31, 2020
Dec. 31, 2019
Oct. 31, 2019
Apr. 30, 2019
Lessee Lease Description [Line Items]              
Operating lease, right-of-use assets       $ 5,827,000 $ 2,497,000    
Operating lease liability       $ 5,987,000      
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 assets       $ 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 assets   $ 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, rent abatement period   7 months          
Foster City Office Space Lease              
Lessee Lease Description [Line Items]              
Operating lease, percentage of discount rate 7.00%            
Operating lease, right-of-use assets $ 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, rent abatement period 3 months