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SUBSEQUENT EVENT (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 11, 2021 | Feb. 11, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Issuance of common stock, net |  |  |  | $ 63,614 | $ 6,652
Cash balances |  |  |  | 50,315 | 1,870
Subsequent Event |  |  |  |  |
Issuance of common stock, net | $ 53,900 |  |  |  |
Cash balances | $ 101,000 | $ 101,000 |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co |  |  |  |  |
Issuance of common stock, net |  |  |  | $ 49,900 | $ 400
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event |  |  |  |  |
Number of common stock issued |  |  | 9,300,000 |  |
Issuance of common stock, net |  |  | $ 47,300 |  |
December 2020 PA | Lincoln Park | Subsequent Event |  |  |  |  |
Number of common stock issued |  | 900,000 |  |  |
Issuance of common stock, net |  | $ 6,600 |  |  |

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