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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Royalty expense | $ 149,000 | $ 1,618,000 | $ 261,000 | $ 4,902,000
1997 Amended License Agreement [Member] |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Royalty expense | 149,000 | 1,600,000 | $ 261,000 | 4,900,000
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 | 4,900,000 |  | $ 4,900,000 |
Research and development expense incurred | $ 394,000 | $ 304,000 | $ 679,000 | $ 581,000

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