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STOCK-BASED COMPENSATION - Stock-based compensation expenses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total stock compensation expenses | $ 1,652,000 | $ 1,361,000 | $ 3,029,125 | $ 2,705,365
Research and development |  |  |  |
Total stock compensation expenses | 709,000 | 528,000 | 1,405,000 | 1,309,000
General and administrative |  |  |  |
Total stock compensation expenses | $ 943,000 | $ 833,000 | $ 1,624,000 | $ 1,396,000

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