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STOCKHOLDER'S EQUITY - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2021 | Feb. 11, 2021 | Feb. 05, 2021 | Dec. 04, 2020 | Oct. 02, 2020 | Jun. 26, 2020 | May 21, 2020 | Aug. 06, 2019 | Jun. 06, 2019 | Apr. 14, 2017 | Feb. 05, 2021 | Jan. 31, 2021 | Oct. 31, 2020 | May 31, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Common stock outstanding after the effect of reverse stock spilt conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,171,859 | 3,339,380 |
Common stock, par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |
Issuance of common stock, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63,614,000 | $ 6,652,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  | $ 53,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,681,968 | 1,902,593 |
December 2020 PA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for financing from common stock |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 2020 PA | Lincoln Park | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
May 2020 Purchase Agreement with Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price |  |  |  |  | $ 3,200,000 |  | $ 12,000,000 |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |
Period for financing from common stock |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  | 1,100,000 | 1,970,000 | 156,250 |  |  |  |  |  |  |  | 1,600,000 | 1.8 |  |  |
Issuance of common stock, net |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |  |  |  | $ 3,500,000 | $ 3,800,000 |  |  |
Number of warrants issued for common stock |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrant purchase price per share |  |  |  |  |  |  | $ 1.2989 |  |  |  |  |  |  |  |  |  |  |  |
2019 Purchase Agreement with 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 1,700,000 | 3,200,000
Issuance of common stock, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 | $ 5,800,000 | $ 7,700,000
2019 Purchase Agreement with Lincoln Park | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock issuable |  |  |  | 19.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Purchase Agreement with Lincoln Park | Lincoln Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage considered for not to sale common stock |  |  |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement with 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 with Lincoln Park | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,515 |  |  |  |  |
ATM Offering Agreement | Lincoln Park | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,900,000 | $ 400,000 |
Number of common stock sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 | 100,000 |
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  |  |  |  | 9,300,000 |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  |  |  |  | $ 47,300,000 |  |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  |  |  | $ 47,300,000 |  |  |  |  |  |  |  |
Number of common stock sold |  |  |  |  |  |  |  |  |  |  | 9,300,000 |  |  |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales commission percentage |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |

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