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SUBSEQUENT EVENT - CAPITAL RAISE (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | May 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Proceeds from common stock |  |  |  |  | $ 13,530,000 | $ 2,628,000 |
Cash balances |  |  | $ 5,480,000 |  | $ 5,480,000 | $ 716,000 | $ 1,870,000
Subsequent Event |  |  |  |  |  |  |
Proceeds from common stock | $ 50,200,000 |  |  |  |  |  |
Cash balances | $ 53,300,000 |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co |  |  |  |  |  |  |
Number of common stock issued |  |  | 2,100,000 |  | 4,100,000 |  |
Proceeds from common stock |  |  | $ 3,700,000 |  | $ 13,900,000 |  |
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event |  |  |  |  |  |  |
Number of common stock issued | 7,300,000 |  |  |  |  |  |
Proceeds from common stock | $ 42,000,000 |  |  |  |  |  |
2019 Purchase Agreement | Lincoln Park |  |  |  |  |  |  |
Number of common stock issued |  | 3,200,000 |  | 623,236 |  |  |
Proceeds from common stock |  | $ 7,700,000 |  | $ 593,356 |  |  |
2019 Purchase Agreement | Lincoln Park | Subsequent Event |  |  |  |  |  |  |
Number of common stock issued | 1,100,000 |  |  |  |  |  |
Proceeds from common stock | $ 8,200,000 |  |  |  |  |  |

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