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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Total stock compensation expenses | $ 1,361,000 | $ 1,363,000 | $ 2,705,365 | $ 2,889,243
Research and development |  |  |  |
Total stock compensation expenses | 528,000 | 593,000 | 1,309,000 | 1,280,000
General and administrative |  |  |  |
Total stock compensation expenses | $ 833,000 | $ 770,000 | $ 1,396,000 | $ 1,609,000

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