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SUBSEQUENT EVENTS, Private Placement Offerings (Details) - USD ($) | May 14, 2021 | Apr. 26, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Private Placement Offerings [Abstract] |  |  |  |
Number of shares authorized to sale in regular purchase (in shares) |  |  | 100,000,000 | 100,000,000
Purchase Agreement [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
Private Placement Offerings [Abstract] |  |  |  |
Proceeds from sale of common stock |  | $ 20,000,000 |  |
Purchase Agreement [Member] | Lincoln Park [Member] | Subsequent Event [Member] |  |  |  |
Private Placement Offerings [Abstract] |  |  |  |
Common stock, shares issued in consideration for purchase commitment (in shares) |  | 56,041 |  |
Common stock issued and sold during period (in shares) | 302,358 |  |  |
Gross proceeds | $ 6,300,000 |  |  |
Purchase Agreement [Member] | Lincoln Park [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
Private Placement Offerings [Abstract] |  |  |  |
Proceeds from sale of common stock |  | $ 20,000,000 |  |
Number of shares authorized to sale in regular purchase (in shares) |  | 60,000 |  |
Maximum commitment in any single regular purchase |  | $ 1,000,000 |  |
Beneficial ownership percentage on total outstanding shares that prohibits company to direct share purchases |  | 4.99% |  |
Purchase Agreement [Member] | Lincoln Park [Member] | Minimum Closing Price 5.50 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
Private Placement Offerings [Abstract] |  |  |  |
Number of shares authorized to sale in regular purchase (in shares) |  | 80,000 |  |
Purchase Agreement [Member] | Lincoln Park [Member] | Minimum Closing Price 7.00 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
Private Placement Offerings [Abstract] |  |  |  |
Number of shares authorized to sale in regular purchase (in shares) |  | 120,000 |  |

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