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NATURE OF OPERATIONS (Details) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2023 USD ($) | Oct. 27, 2023 $ / shares shares | Feb. 10, 2023 | Mar. 31, 2024 USD ($) segment shares | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |
Reverse stock split ratio |  |  | 0.0556 |  |  |
Outstanding warrants to purchase common stock (in shares) | shares |  |  |  | 27,509 |  |
Cash and investments |  |  |  | $ 86,000,000 |  |
Accumulated Deficit |  |  |  | 697,585,000 |  | $ 691,336,000
Debt outstanding |  |  |  | 0 |  |
Net loss |  |  |  | 6,249,000 | $ 5,622,000 |
Cash used in operations |  |  |  | 7,982,000 | $ 5,478,000 |
Private Placement |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares |  | 10,652,543 |  |  |  |
Price per share (in dollars per share) | $ / shares |  | $ 2.245 |  |  |  |
Consideration received in a transaction | $ 88,200,000 |  |  |  |  |
Payments of stock issuance costs | 5,500,000 |  |  |  |  |
Net proceeds from private placement | $ 82,700,000 |  |  |  |  |
Pre-Funded Warrants |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |
Outstanding warrants to purchase common stock (in shares) | shares |  | 28,614,437 |  |  |  |
Lincoln Park Equity Purchase Agreement |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |
Sale of stock, public float threshold |  |  |  | $ 75,000,000 |  |

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