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Net Loss Per Share Attributable to Common Stockholders (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Net Loss Per Share Attributable to Common Stockholders [Abstract] |  |
Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders | The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):
|  | Three Months Ended June 30, 2025 |  | Three Months Ended June 30, 2024
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (2,348 | ) |  | $ | (2,071 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average shares used to computing basic and diluted net loss per share |  |  | 5,604,651 |  |  |  | 5,601,651 |
Net loss per share attributable to common stockholders – basic and diluted: |  | $ | (0.42 | ) |  | $ | (0.37 | )
|  | Six Months Ended June 30, 2025 |  | Six Months Ended June 30, 2024
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (5,064 | ) |  | $ | (4,481 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average shares used to computing basic and diluted net loss per share |  |  | 5,604,651 |  |  |  | 5,601,651 |
Net loss per share attributable to common stockholders – basic and diluted: |  | $ | (0.90 | ) |  | $ | (0.80 | )
| The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data):
|  | Year Ended December 31, 2024 |  | Year Ended December 31, 2023
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (9,230 | ) |  | $ | (10,281 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average shares used to computing basic and diluted net loss per share |  |  | 5,604,651 |  |  |  | 5,600,741 |
Net loss per share attributable to common stockholders – basic and diluted: |  | $ | (1.65 | ) |  | $ | (1.84 | )
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders |  | The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:
|  | Years ended December 31,
|  | 2024 |  | 2023
Convertible preferred stock |  | 17,863,934 |  |  | 17,863,934 |
Convertible notes payable |  | 3,363,624 |  |  | 2,251,941 | ​(1)
Convertible loans |  | — | ​(2) |  | — |
Options to purchase common stock |  | 2,972,055 |  |  | 2,982,055 |
Total |  | 24,199,613 |  |  | 23,097,930 |
(1) The conversion of the Convertible Notes and Senior Notes to common stock is dependent on the price of SPAC transaction or other equity offering and the completion date of such offerings. These factors are not estimable, therefore, the number of common stock is not determinable. (2) The Tasly Convertible Notes issued between June and August 2023 and completed in February 2024 are convertible upon occurrence of various conversion scenarios. Therefore, the number of common stock shares issuable upon their conversion is not currently estimable.
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders | The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:
|  | Three months ended June 30,
|  | 2025 |  | 2024
Convertible preferred stock |  | 17,863,934 |  |  | 17,863,934 |
Convertible notes payable(1) |  | 42,430,263 |  |  | 25,721,548 |
Convertible loans |  | — | ​(2) |  | — | ​(2)
Options to purchase common stock |  | 4,520,250 |  |  | 2,972,055 |
Total |  | 64,814,447 |  |  | 46,557,537 |
(1) The conversion of the Convertible Notes and Senior Notes to common stock is dependent on the price of SPAC transaction or other equity offering and the completion date of such offerings. These factors are not estimable, therefore, the number of common stock is not determinable. (2) The Tasly Convertible Notes issued between June and August 2023 and completed in February 2024 are convertible upon occurrence of various conversion scenarios. Therefore, the number of common stock shares issuable upon their conversion is not currently estimable. The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:
|  | Six months ended June 30,
|  | 2025 |  | 2024
Convertible preferred stock |  | 17,863,934 |  |  | 17,863,934 |
Convertible notes payable(1) |  | 42,430,263 |  |  | 25,721,548 |
Convertible loans |  | — | ​(2) |  | — | ​(2)
Options to purchase common stock |  | 4,520,250 |  |  | 2,972,055 |
Total |  | 64,814,447 |  |  | 46,557,537 |
(1) The conversion of the Convertible Notes and Senior Notes to common stock is dependent on the price of SPAC transaction or other equity offering and the completion date of such offerings. These factors are not estimable, therefore, the number of common stock is not determinable. (2) The Tasly Convertible Notes issued between June and August 2023 and completed in February 2024 are convertible upon occurrence of various conversion scenarios. Therefore, the number of common stock shares issuable upon their conversion is not currently estimable. |

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- Definition Tabular of diluted net loss per share attributable to common stockholders. + References No definition available. + Details
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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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