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SUBSEQUENT EVENTS (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Apr. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Oct. 01, 2019
Subsequent Event [Line Items]                    
Operating lease, right-of-use asset     $ 349,000         $ 349,000    
Issuance of common stock in connection with at market offering, net of issuance costs     $ 8,959,000 $ 101,000 $ 2,158,000 $ 82,306,000 $ 1,553,000      
2018 Sales Agreement                    
Subsequent Event [Line Items]                    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares)     6,197,956   636,053     6,306,342 10,083,079  
Issuance of common stock in connection with at market offering, net of issuance costs     $ 8,959,000   $ 2,158,000     $ 9,060,000 $ 38,366,000  
New Jersey Office Space Lease                    
Subsequent Event [Line Items]                    
Operating lease, initial term   11 years                
Operating lease term, option to extend additional period   5 years                
Operating lease initial term, aggregate minimum future lease payments   $ 3,696,000                
Operating lease, rent abatement period   7 months                
Subsequent Event | 2018 Sales Agreement                    
Subsequent Event [Line Items]                    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares) 6,908,525                  
Issuance of common stock in connection with at market offering, net of issuance costs $ 10,232,000                  
Subsequent Event | Foster City | Office Space                    
Subsequent Event [Line Items]                    
Operating lease, initial term 87 months                  
Operating lease term, option to extend additional period 5 years                  
Operating lease initial term, aggregate minimum future lease payments $ 4,400,000                  
Operating lease, rent abatement period 3 months                  
Subsequent Event | New Jersey Office Space Lease                    
Subsequent Event [Line Items]                    
Operating lease, initial term                   11 years
Operating lease, right-of-use asset                   $ 2,400,000
Operating lease liability                   $ 2,400,000
Operating lease incremental borrowing rate                   8.00%
Operating lease initial term, aggregate minimum future lease payments                   $ 3,696,000