SHARED-BASED COMPENSATION - Financial Statements (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Allocated share-based compensation expense | $ 4,021,000 | $ 852,000 | $ 4,297,000 | $ 1,378,000 |
| Research and Development Expense | ||||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Allocated share-based compensation expense | 1,460,550 | 351,000 | 1,588,550 | 443,000 |
| General and Administrative Expense | ||||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Allocated share-based compensation expense | $ 2,560,450 | $ 501,000 | $ 2,708,450 | $ 935,000 |