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STOCKHOLDERS’ EQUITY - Narrative (Details) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 13, 2021 USD ($) $ / shares shares | Aug. 12, 2020 shares | Mar. 31, 2022 USD ($) vote $ / shares shares | Mar. 31, 2021 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | May 31, 2018 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, proceeds | $ | $ 36,600,000 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 10,000,000 |  | 10,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |
Common stock, shares authorized (in shares) |  |  | 200,000,000 |  | 200,000,000 |
Number of votes for each share held | vote |  |  | 1 |  |  |
Common Stock Warrant |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Warrants outstanding (in shares) |  |  | 12,517,328 |  | 12,517,328 |
Warrants, aggregate intrinsic value, outstanding | $ |  |  | $ 0 |  | $ 0 |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Offering price (in dollars per share) | $ / shares | $ 1.55 |  |  |  |  |
Issuance of common stock upon conversion of Series X Convertible Preferred Stock (in shares) |  | 522,410 |  |  |  |
Series X Convertible Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Offering price (in dollars per share) | $ / shares | $ 15.50 |  |  |  |  |
Preferred stock, shares issued (in shares) | 774,194 |  | 1,870,713 |  | 1,818,472 |
Proceeds from right offerings | $ | $ 38,500,000 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 4,947,759 |  | 4,947,759 | 5,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Issuance of common stock upon conversion of Series X Convertible Preferred Stock (in shares) |  | 52,241 |  |  |  |
Common stock issued for each preferred stock (in shares) |  |  | 10 |  |  |
Maximum ownership following conversion |  |  | 9.99% |  |  |
Weighted Average | Common Stock Warrant |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Exercise price of warrant (in dollars per share) | $ / shares |  |  | $ 6.82 |  | $ 6.82 |
Controlled Equity Sales Agreement, Cantor Fitzgerald and Company |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares sold (in shares) |  |  | 644,265 | 3,327,706 |  |
Net proceeds | $ |  |  | $ 500,000 | $ 8,600,000 |  |
Consideration remaining on transaction | $ |  |  | $ 48,000,000 |  |  |
Public Stock Offering | Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares sold (in shares) | 17,064,511 |  |  |  |  |
Over-Allotment Option | Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares sold (in shares) | 2,225,805 |  |  |  |  |

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