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RESEARCH AND LICENSE AGREEMENTS WITH PRINCETON UNIVERSITY, UNIVERSITY OF SOUTHERN CALIFORNIA AND THE UNIVERSITY OF MICHIGAN - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Royalty expense $ 3,293,000 $ 2,837,000 $ 8,195,000 $ 8,828,000
1997 Amended License Agreement [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Royalty expense 3,300,000 2,800,000 $ 8,200,000 8,800,000
Royalty rate for licensed products sold by the Company (in hundredths)     3.00%  
Royalty rate for licensed products sold by the Company's sublicenses (in hundredths)     3.00%  
2006 Research Agreement [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research agreement, extension term (in years)     2 years  
Research agreement, new amendment expiration date     Apr. 30, 2023  
Maximum obligation 7,600,000   $ 7,600,000  
Research and development expense incurred $ 309,000 $ 212,000 $ 890,000 $ 715,000