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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

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