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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2025 | Feb. 12, 2025 | Nov. 22, 2023 | Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Dec. 31, 2025 | Mar. 18, 2026 | Dec. 31, 2024
Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  | 7 years |  |  |  | 7 years |  | 7 years |  |  |
Hyperfine Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increased number of shares available for grant |  |  |  |  |  |  |  |  |  |  | 3,888,869 |  |
Common stock shares outstanding percentage |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Weighted-average grant date fair value of options granted |  |  |  | $ 0.8 |  |  |  | $ 0.8 |  |  |  |  |
Common stock remains available for issuance |  |  |  | 6,409,893 |  |  |  | 6,409,893 |  | 6,409,893 |  |  |
Common Stock | Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Unit | Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  | 4,511,278 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Unit | Common Stock | Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock price |  | $ 1.33 |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price |  | $ 1.33 |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Maximum | At-the-market Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of securities |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |
Class A Common Stock | At-the-market Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  | $ 11,375,000 | $ 835,000 |  |  |  |
Class A Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 90,987,381 | 83,464,909 | 63,525,713 | 62,784,562 | 90,987,381 | 63,525,713 | 90,987,381 | 82,166,458 |  | 58,076,261
Class A Common Stock | Common Stock | At-the-market Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | 3,464,325 |  |  | 7,131,767 | 678,012 | 681,793 | 126,398 | 7,809,779 |  | 7,809,779 |  |  |
Gross proceeds from issuance of common stock | $ 4,350,000 |  |  | $ 10,843,000 |  |  |  | $ 11,667,000 |  | $ 11,667,000 |  |  |
Net proceeds after deducting commissions and other offering expenses | 4,165,000 |  |  | $ 10,572,000 |  |  |  | $ 11,375,000 |  | $ 11,375,000 |  |  |
Class A Common Stock | Common Stock | Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 4,511,278 |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Warrants | Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price |  |  |  | $ 1.2 |  |  |  | $ 1.2 |  | $ 1.2 |  |  |
Warrants expiration period |  |  |  | 7 years |  |  |  | 7 years |  | 7 years |  |  |
Class A Common Stock | Additional Warrants | Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 1.2 |
Warrants expiration period |  |  |  | 7 years |  |  |  | 7 years |  | 7 years |  | 7 years |
Warrants |  |  |  |  |  |  |  |  |  |  |  | 520,835 |
Class A Common Stock | Maximum | At-the-market Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of securities | $ 50,000 |  | $ 50,000 |  |  |  |  |  |  |  |  |  |

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