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STOCK-BASED COMPENSATION - Stock-based compensation expenses (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Total stock compensation expenses | $ 1,270,000 | $ 1,184,000 | $ 3,974,536 | $ 4,073,505
Research and development |  |  |  |
Total stock compensation expenses | 636,000 | 553,000 | 1,945,000 | 1,844,000
General and administrative |  |  |  |
Total stock compensation expenses | $ 634,000 | $ 631,000 | $ 2,030,000 | $ 2,230,000

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