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STOCKHOLDERS' EQUITY - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Aug. 31, 2024 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) $ / shares year shares | Jun. 30, 2025 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) $ / shares year shares | Sep. 30, 2024 shares | Mar. 31, 2024 shares | Sep. 30, 2025 USD ($) $ / shares year shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 $ / shares
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of warrants (in shares) | shares |  |  | 40,000 |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 7.50 |  |  |  |  | $ 7.50 |  | $ 12.63
Proceeds from the exercise of warrants, net | $ |  |  |  |  |  |  | $ 10,482,000 | $ 1,983,000 |
Warrants, issued (in shares) | shares |  |  |  |  |  |  | 5,310,676 |  |
Gross proceeds from issuances of common stock | $ |  |  |  |  |  |  | $ 3,000,000.0 |  |
Stock issuance costs | $ |  |  |  |  |  |  | 299,000 |  |
Remaining borrowing capacity | $ |  | $ 7,500,000 |  |  |  |  | $ 7,500,000 |  |
Series H |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of warrants (in shares) | shares |  | 1,458,872 | 1,458,872 |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 4.15 |  |  |  |  | $ 4.15 |  |
Sale of stock, price per share (in dollars per share) |  | $ 0.125 | $ 0.125 |  |  |  | $ 0.125 |  |
Proceeds from the exercise of warrants, net | $ |  | $ 274,000 | $ 182,000 |  |  |  |  |  |
Warrants, issued (in shares) | shares |  |  |  |  |  |  | 1,458,872 |  |
Warrant exercise, gross proceeds | $ |  | 6,300,000 | 4,500,000 |  |  |  |  |  |
Warrant exercise, issuance cost | $ |  | $ 685,000 | $ 526,000 |  |  |  |  |  |
Series H | Maximum |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of warrants (in shares) | shares |  |  | 1,458,872 |  |  |  |  |  |
Series H | Measurement Input, Share Price |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  | 5.09 |  |  |  |  | 5.09 |  |
Series H | Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  | 1.14 |  |  |  |  | 1.14 |  |
Series H | Measurement Input, Expected Term |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input | year |  | 1.3 |  |  |  |  | 1.3 |  |
Series H | Measurement Input, Expected Dividend Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  | 0 |  |  |  |  | 0 |  |
Series H | Measurement Input, Risk Free Interest Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  | 0.037 |  |  |  |  | 0.037 |  |
Original Warrants |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 2.90 |  |  |  |  |  |  |  |
Warrant exercise, gross proceeds | $ | $ 1,100,000 |  |  |  |  |  |  |  |
Warrant exercise, issuance cost | $ | $ 250,000 |  |  |  |  |  |  |  |
Modification of terms related to certain warrants | $ |  |  |  | $ 58,000 |  |  |  |  |
Series F-1 |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.35 | $ 4.35 |  |  |  |  | $ 4.35 |  |
Warrants, issued (in shares) | shares | 251,884 |  |  |  |  |  | 0 |  |
Weighted average remaining life | 4 years 6 months |  |  |  |  |  |  |  |
Series F-1 | Measurement Input, Share Price |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 2.38 |  |  |  |  |
Series F-1 | Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 1.20 |  |  |  |  |
Series F-1 | Measurement Input, Expected Term |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input | year |  |  |  | 4.5 |  |  |  |  |
Series F-1 | Measurement Input, Expected Dividend Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 0 |  |  |  |  |
Series F-1 | Measurement Input, Risk Free Interest Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 0.040 |  |  |  |  |
Series F-2 |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.35 | $ 4.35 |  |  |  |  | $ 4.35 |  |
Warrants, issued (in shares) | shares | 122,834 |  |  |  |  |  | 0 |  |
Weighted average remaining life | 1 year |  |  |  |  |  |  |  |
Series F-2 | Measurement Input, Share Price |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 2.38 |  |  |  |  |
Series F-2 | Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 1.11 |  |  |  |  |
Series F-2 | Measurement Input, Expected Term |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input | year |  |  |  | 1 |  |  |  |  |
Series F-2 | Measurement Input, Expected Dividend Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 0 |  |  |  |  |
Series F-2 | Measurement Input, Risk Free Interest Rate |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, fair value, measurement input |  |  |  | 0.040 |  |  |  |  |
Series F-1, Series F-2 and Dealer Manager Warrants |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants, issued (in shares) | shares |  |  |  | 1,517,608 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of warrants (in shares) | shares |  | 1,458,872 | 1,498,872 | 374,718 | 505,502 | 460 |  |  |
Issuance of common stock, net of issuance costs (in shares) | shares |  |  | 489,341 | 365,319 |  |  | 854,660 |  |

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