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COMMON STOCK - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Nov. 12, 2020 | Oct. 02, 2020 | May 21, 2020 | Apr. 28, 2020 | Aug. 06, 2019 | Jun. 06, 2019 | May 30, 2019 | Oct. 31, 2020 | May 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Common stock outstanding after the effect of reverse stock spilt conversion |  |  |  |  |  |  |  |  |  | 10,433,851 |  |  | 10,433,851 |  | 3,339,380
Common stock, par value |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001
Proceeds from common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,530,000 | $ 2,628,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock |  |  |  |  |  |  |  | $ 50,200,000 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  |  | 3,769,036 |  | 466,785 | 7,093,960 | 688,208 |
2020 Purchase Agreement | Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price |  |  | $ 12,000,000 | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |
Period for financing from common stock |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  | 156,250 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued for common stock |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrant purchase price per share |  |  | $ 1.2989 |  |  |  |  |  |  |  |  |  |  |  |
2019 Purchase Agreement | Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price |  |  |  |  | $ 3,200,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |
Period for financing from common stock |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Securities Purchase Agreement | Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  | 104,294 |  |  |  |  |  |  |  |
Aggregate gross proceeds from common shares and warrants |  |  |  |  |  |  | $ 550,751 |  |  |  |  |  |  |  |
Warrant purchase price per share |  |  |  |  |  |  | $ 5.062 |  |  |  |  |  |  |  |
Securities Purchase Agreement | Lincoln Park | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued for common stock |  |  |  |  |  |  | 182,515 |  |  |  |  |  |  |  |
ATM Offering Agreement | Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales commission percentage |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |
Registration rights agreement | Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  | 1,970,000 |  |  |  |  |  |  | 1,600,000 |  |  | 1,800,000 |  |
Proceeds from common stock |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  | $ 3,800,000 |  |
Registration rights agreement | Lincoln Park | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares for resale |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |
Proceeds from common stock |  |  |  |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |

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