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RESEARCH AND LICENSE AGREEMENTS WITH PRINCETON UNIVERSITY, UNIVERSITY OF SOUTHERN CALIFORNIA AND THE UNIVERSITY OF MICHIGAN - Additional Information (Details) - USD ($)
 12 Months Ended 36 Months Ended 43 Months Ended 48 Months Ended 84 Months Ended 120 Months Ended
Jun. 01, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2009
Dec. 31, 2016
Apr. 30, 2013
Apr. 30, 2013
Jul. 31, 2007
Research and Development Arrangement, Contract to Perform for Others [Line Items]                  
Royalty expense   $ 5,823,000 $ 5,370,000 $ 4,519,000          
1997 Research Agreement [Member]                  
Research and Development Arrangement, Contract to Perform for Others [Line Items]                  
Term of agreement (in years)                 10 years
2006 Research Agreement - Original Term [Member]                  
Research and Development Arrangement, Contract to Perform for Others [Line Items]                  
Term of agreement (in years)         3 years   4 years    
Research and development expense incurred               $ 5,000,000  
2006 Research Agreement - Extended Term [Member]                  
Research and Development Arrangement, Contract to Perform for Others [Line Items]                  
Term of agreement (in years) 4 years                
Research and development expense incurred           $ 3,900,000      
Maximum obligation   $ 1,600,000       $ 1,600,000      
1997 Amended License Agreement [Member]                  
Research and Development Arrangement, Contract to Perform for Others [Line Items]                  
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%              
Minimum royalty payment per year   $ 100,000              
Royalty expense   5,800,000 $ 5,400,000 $ 4,500,000          
Minimum investment per year   $ 800,000