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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
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |
Royalty expense | $ 11,125,000 | $ 11,776,000 | $ 6,996,000
Maximum obligation | 6,900,000 |  |
Research and development expense incurred | $ 1,200,000 | 997,000 | 1,100,000
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% |  |
Royalty expense | $ 11,100,000 | $ 11,800,000 | $ 7,000,000.0

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- Definition The maximum amount the Company is obligated to pay under the specified research agreement, as of the balance sheet date. + References No definition available. + Details
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- Definition The royalty rate of net sales price for licensed products sold by the Company, under the specified arrangement. + References No definition available. + Details
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- Definition The royalty rate of revenues received by the Company for licensed products sold by the Company's sublicenses, under the specified arrangement. + References No definition available. + Details
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