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Net Loss per Share Attributable to Common Stockholders - Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities | 64,814,447 |  | 46,557,537 |  | 64,814,447 |  | 46,557,537 |  | 24,199,613 |  | 23,097,930 |
Convertible preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities | 17,863,934 |  | 17,863,934 |  | 17,863,934 |  | 17,863,934 |  | 17,863,934 |  | 17,863,934 |
Convertible notes payable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities | 42,430,263 | [1] | 25,721,548 | [1] | 42,430,263 | [1] | 25,721,548 | [1] | 3,363,624 |  | 2,251,941 | [2]
Convertible loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities |  | [3] |  | [3] |  | [3] |  | [3] |  | [4] |  |
Options to purchase common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities | 4,520,250 |  | 2,972,055 |  | 4,520,250 |  | 2,972,055 |  | 2,972,055 |  | 2,982,055 |
[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 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.
[3] | 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.
[4] | 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 Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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