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		29 Months Ended	36 Months Ended	48 Months Ended	53 Months Ended	84 Months Ended	120 Months Ended
	May 01, 2017	Jun. 01, 2013	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Apr. 30, 2009	Apr. 30, 2013	Oct. 31, 2017	Apr. 30, 2013	Jul. 31, 2007
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty expense			$ 2,837,000	$ 2,229,000	$ 8,828,000	$ 5,028,000
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											$ 5,000,000.0
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										$ 4,600,000
2006 Research Agreement - Extended Term Three [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Term of agreement (in years)	3 years
Research and development expense incurred							$ 2,300,000
Maximum obligation			2,100,000		$ 2,100,000		$ 2,100,000
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			$ 2,800,000	$ 2,200,000	8,800,000	$ 5,000,000.0
Minimum investment per year					$ 800,000