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GRANT INCOME (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Aug. 31, 2021 | Mar. 31, 2022 | Dec. 31, 2021
GRANT INCOME. |  |  |
Receipt of product development research award | $ 13,100,000 |  |
Funds received from CPRIT grant |  |  | $ 2,400,000
Revenue from CPRIT |  | $ 1,000,000.0 |
Restricted cash |  | 200,000 |
Deferred revenue |  | $ 200,000 |

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