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Fair Value Measurement (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Fair Value Measurement [Line Items] |  |
Schedule of Financial Liabilities Measured at Fair Value on a Recurring Basis | As of June 30, 2025, the Company’s financial liabilities measured at fair value on a recurring basis, were as follows (in thousands)
|  | Fair value as of June 30, 2025 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,543 |  |  | $ | 2,543 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,543 |  |  | $ | 2,543 |
|  | Fair value as of December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,234 |  |  | $ | 2,234 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,234 |  |  | $ | 2,234 |
| As of December 31, 2024 and 2023, the Company’s financial liabilities measured at fair value on a recurring basis, were as follows (in thousands):
|  | Fair value as of December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,235 |  |  | $ | 2,235 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,235 |  |  | $ | 2,235 |
|  | Fair value as of December 31, 2023 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes at fair value |  | $ | — |  |  | $ | — |  |  | $ | 1,714 |  |  | $ | 1,714 |
Total assets measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 1,714 |  |  | $ | 1,714 |
Schedule of Fair Value of the Company’s Level 3 Financial Instruments | The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments for the three and six months ended June 30, 2025 and 2024 (in thousands):
|  | Tasly convertible debt at fair value |
Fair value as of January 1, 2024 |  | $ | 1,714 |
Issuance of Convertible Notes |  |  | 16 |
Accrued stated interest |  |  | 48 |
Change in fair value included in other income and gain on change in the fair value of Tasly convertible debt |  |  | (4 | )
Fair value as of March 31, 2024 |  | $ | 1,774 |
Accrued stated interest |  |  | 49 |
Change in fair value included in other income and loss on change in the fair value of Tasly convertible debt |  |  | 15 |
Fair value as of June 30, 2024 |  | $ | 1,838 |
Fair value as of January 1, 2025 |  | $ | 2,234 |
Accrued stated interest |  |  | 95 |
Change in fair value included in other income and loss on change in the fair value of Tasly convertible debt |  |  | 61 |
Fair value as of March 31, 2025 |  | $ | 2,390 |
Accrued stated interest |  |  | 96 |
Change in fair value included in other income and loss on change in the fair value of Tasly convertible debt |  |  | 57 |
Fair value as of June 30, 2025 |  | $ | 2,543 |
| The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments for the years ended December 31, 2024 and 2023 (in thousands):
|  | Tasly convertible debt at fair value |
Fair value as of January 1, 2023 |  | $ | — |
Issuance of Convertible Notes |  |  | 1,600 |
Accrued stated interest |  |  | 92 |
Change in fair value included in other income and loss on change in the fair value of Tasly convertible debt |  |  | 22 |
Fair value as of December 31, 2023 |  | $ | 1,714 |
Fair value as of January 1, 2024 |  | $ | 1,714 |
Issuance of Convertible Notes |  |  | 16 |
Accrued stated interest |  |  | 194 |
Change in fair value included in other income and loss on change in the fair value of Tasly convertible debt |  |  | 311 |
Fair value as of December 31, 2024 |  | $ | 2,235 |
NorthView Acquisition Corp [Member] |  |
Fair Value Measurement [Line Items] |  |
Schedule of Company’s Assets and Liabilities that are Measured at Fair Value | The following tables present information about the Company’s assets and liabilities that are measured at fair value on June 30, 2025 and December 31, 2024, and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value:
|  | June 30, 2025 |  |  | Quoted Prices In Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash held in trust |  | $ | 1,935,561 |  |  | $ | 1,274,549 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities – Public Warrants |  | $ | 3,795,000 |  |  | $ | — |  |  | $ | 3,795,000 |  |  | $ | — |
Warrant liabilities – Private Placement Warrants |  |  | 2,939,000 |  |  |  | — |  |  |  | — |  |  |  | 2,939,000 |
Warrant liabilities – Representative’s Warrants |  |  | 227,700 |  |  |  | — |  |  |  | — |  |  |  | 227,700 |
Convertible Promissory Note – Related Party |  |  | 10,288,111 |  |  |  | — |  |  |  | — |  |  |  | 10,288,111 |
Securities Purchase Agreement |  |  | 193,878 |  |  |  | — |  |  |  | — |  |  |  | 193,878 |
Total |  | $ | 17,443,689 |  |  | $ | — |  |  | $ | 3,795,000 |  |  | $ | 13,648,689 |
|  | December 31, 2024 |  |  | Quoted Prices In Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash held in trust |  | $ | 8,330,835 |  |  | $ | 8,330,835 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities – Public Warrants |  | $ | 379,500 |  |  | $ | — |  |  | $ | 379,500 |  |  | $ | — |
Warrant liabilities – Private Placement Warrants |  |  | 293,900 |  |  |  | — |  |  |  | — |  |  |  | 293,900 |
Warrant liabilities – Representative’s Warrants |  |  | 22,770 |  |  |  | — |  |  |  | — |  |  |  | 22,770 |
Convertible Promissory Note – Related Party |  |  | 8,908,052 |  |  |  | — |  |  |  | — |  |  |  | 8,908,052 |
Total |  | $ | 9,604,222 |  |  | $ | — |  |  | $ | 379,500 |  |  | $ | 9,224,722 |
| The following tables present information about the Company’s assets and liabilities that are measured at fair value on December 31, 2024 and 2023, and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value:
|  | December 31, 2024 |  |  | Quoted Prices In Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and marketable securities held in trust |  | $ | 8,330,835 |  |  | $ | 8,330,835 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities – Public Warrants |  | $ | 379,500 |  |  | $ | — |  |  | $ | 379,500 |  |  | $ | — |
Warrant liabilities – Private Placement Warrants |  |  | 293,900 |  |  |  | — |  |  |  | — |  |  |  | 293,900 |
Warrant liabilities – Representative’s Warrants |  |  | 22,770 |  |  |  | — |  |  |  | — |  |  |  | 22,770 |
Convertible promissory note |  |  | 8,908,052 |  |  |  | — |  |  |  | — |  |  |  | 8,908,052 |
Total |  | $ | 9,604,222 |  |  | $ | — |  |  | $ | 379,500 |  |  | $ | 9,224,722 |
|  | December 31, 2023 |  |  | Quoted Prices In Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and marketable securities held in trust |  | $ | 10,873,406 |  |  | $ | 10,873,406 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities – Public Warrants |  | $ | 85,388 |  |  | $ | 85,388 |  |  | $ | — |  |  | $ | — |
Warrant liabilities – Private Placement Warrants |  |  | 66,128 |  |  |  | — |  |  |  | — |  |  |  | 66,128 |
Warrant liabilities – Representative’s Warrants |  |  | 5,123 |  |  |  | — |  |  |  | — |  |  |  | 5,123 |
Convertible promissory note |  |  | 944,118 |  |  |  | — |  |  |  | — |  |  |  | 944,118 |
Total |  | $ | 1,100,757 |  |  | $ | 85,388 |  |  | $ | — |  |  | $ | 1,015,369 |
Schedule of Inputs into the Monte Carlo Simulation for the Warrant Liabilities and Convertible Promissory Note | The key inputs into the Monte Carlo simulation model for the warrant liabilities were as follows at June 30, 2025 and December 31, 2024:
|  | June 30, 2025 |  |  | December 31, 2024 |
Input |  |  |  |  |  |
Risk-free interest rate |  |  | 4.22 | % |  |  | 4.18 | %
Expected term (years) |  |  | 0.61 |  |  |  | 0.89 |
Expected volatility |  |  | De minimis | % |  |  | De minimis | %
Exercise price |  | $ | 11.50 |  |  | $ | 11.50 |
Fair value of Common stock |  | $ | 12.52 |  |  | $ | 12.12 |
The key inputs into the Monte Carlo simulation model for the convertible promissory note were as follows at June 30, 2025 and December 31, 2024:
|  | June 30, 2025 |  |  | December 31, 2024 |
Input |  |  |  |  |  |
Risk-free interest rate |  |  | 4.28 | % |  |  | 4.18 | %
Expected term (years) |  |  | 0.05 |  |  |  | 0.27 |
Expected volatility |  |  | De minimis | % |  |  | De minimis | %
Exercise price |  | $ | 11.50 |  |  | $ | 11.50 |
Fair value of Common stock |  | $ | 12.52 |  |  | $ | 12.12 |
The key inputs into the Monte Carlo simulation model for the securities purchase agreement were as follows at June 30, 2025 and December 31, 2024:
|  | June 30, 2025 |  |  | December 31, 2024 |
Input |  |  |  |  |  |
Risk-free interest rate |  |  | 3.83 | % |  |  | — |
Expected term (years) |  |  | 1.59 |  |  |  | — |
Expected volatility |  |  | 4.84 | % |  |  | — |
Exercise price |  | $ | 11.50 |  |  |  | — |
Fair value of Common stock |  | $ | 12.52 |  |  |  | — |
| The key inputs into the Monte Carlo simulation model for the warrant liabilities were as follows at December 31, 2024 and 2023:
|  | December 31, 2024 |  |  | December 31, 2023 |
Input |  |  |  |  |  |
Risk-free interest rate |  |  | 4.18 | % |  |  | 5.06 | %
Expected term (years) |  |  | 0.89 |  |  |  | 0.71 |
Expected volatility |  |  | De minimis | % |  |  | De minimis | %
Exercise price |  | $ | 11.50 |  |  | $ | 11.50 |
Fair value of Common stock |  | $ | 12.12 |  |  | $ | 11.16 |
The key inputs into the Monte Carlo simulation model for the convertible promissory note were as follows at December 31, 2024 and 2023:
|  | December 31, 2024 |  |  | December 31, 2023 |
Input |  |  |  |  |  |
Risk-free interest rate |  |  | 4.18 | % |  |  | 5.48 | %
Expected term (years) |  |  | 0.27 |  |  |  | 0.19 |
Expected volatility |  |  | De minimis | % |  |  | De minimis | %
Exercise price |  | $ | 11.50 |  |  | $ | 11.50 |
Fair value of Common stock |  | $ | 12.12 |  |  | $ | 11.16 |
Schedule of Level 3 Financial Instruments that are Measured at Fair Value on a Recurring Basis | The following table provides a summary of the changes in the fair value of the Company’s Level 3 financial instruments that are measured at fair value on a recurring basis for the three and six months ended June 30, 2025 and 2024:
|  | Private Placement Warrants |  |  | Representative’s Warrants |  |  | Warrant Liability |
Fair value at December 31, 2024 |  | $ | 293,900 |  |  | $ | 22,770 |  |  | $ | 316,670 |
Change in fair value of warrant liabilities |  |  | 146,950 |  |  |  | 11,385 |  |  |  | 158,335 |
Fair value at March 31, 2025 |  |  | 440,850 |  |  |  | 34,155 |  |  |  | 475,005 |
Change in fair value of warrant liabilities |  |  | 2,498,150 |  |  |  | 193,545 |  |  |  | 2,691,695 |
Fair value at June 30, 2025 |  | $ | 2,939,000 |  |  | $ | 227,700 |  |  | $ | 3,166,700 |
|  | Private Placement Warrants |  |  | Representative’s Warrants |  |  | Warrant Liability |
Fair value at December 31, 2023 |  | $ | 66,128 |  |  | $ | 5,123 |  |  | $ | 71,251 |
Change in fair value of warrant liabilities |  |  | 213,077 |  |  |  | 16,509 |  |  |  | 229,586 |
Fair value at March 31, 2024 |  |  | 279,205 |  |  |  | 21,632 |  |  |  | 300,837 |
Change in fair value of warrant liabilities |  |  | 124,908 |  |  |  | 9,676 |  |  |  | 134,584 |
Fair value at June 30, 2024 |  | $ | 404,113 |  |  | $ | 31,308 |  |  | $ | 435,421 |
| The following table provides a summary of the changes in the fair value of the Company’s Level 3 financial instruments that are measured at fair value on a recurring basis for the years ended December 31, 2024 and 2023:
|  | Private Placement Warrants |  |  | Representative’s Warrants |  |  | Warrant Liability |
Fair value at December 31, 2023 |  | $ | 66,128 |  |  | $ | 5,123 |  |  | $ | 71,251 |
Change in fair value of warrant liabilities |  |  | 227,772 |  |  |  | 17,647 |  |  |  | 245,419 |
Fair value at December 31, 2024 |  | $ | 293,900 |  |  | $ | 22,770 |  |  | $ | 316,670 |
|  | Private Placement Warrants |  |  | Representative’s Warrants |  |  | Warrant Liability |
Fair value at December 31, 2022 |  | $ | 377,857 |  |  | $ | 29,274 |  |  | $ | 407,131 |
Change in fair value of warrant liabilities |  |  | (311,729 | ) |  |  | (24,151 | ) |  |  | (335,880 | )
Fair value at December 31, 2023 |  | $ | 66,128 |  |  | $ | 5,123 |  |  | $ | 71,251 |
Schedule of Convertible Promissory Note |
|  | Convertible Promissory Note – related party |
Fair value at December 31, 2024 |  | $ | 8,908,052 |
Change in fair value of convertible promissory note |  |  | 225,330 |
Fair value at March 31, 2025 |  |  | 9,133,382 |
Change in fair value of convertible promissory note |  |  | 1,154,729 |
Fair value at June 30, 2025 |  | $ | 10,288,111 |
|  | Convertible Promissory Note |
Fair value at December 31, 2023 |  | $ | 944,118 |
Principal proceeds |  |  | 378,185 |
Change in fair value of convertible promissory note |  |  | (60,077 | )
Fair value at March 31, 2024 |  |  | 1,262,226 |
Proceeds received through convertible promissory note |  |  | 330,796 |
Change in fair value of convertible promissory note |  |  | (66,021 | )
Fair value at June 30, 2024 |  | $ | 1,527,001 |
|  | Securities Purchase Agreement |
Fair value at February 11, 2025 |  | $ | — |
Change in fair value of securities purchase agreement |  |  | 23,487 |
Fair value at March 31, 2025 |  |  | 23,487 |
Change in fair value of securities purchase agreement |  |  | 170,391 |
Fair value at June 30, 2025 |  | $ | 193,878 |
|  | Convertible Promissory Note |
Fair value at December 31, 2023 |  | $ | 944,118 |
Principal borrowing |  |  | 797,981 |
Change in fair value of convertible promissory note |  |  | 7,165,953 |
Fair value at December 31, 2024 |  | $ | 8,908,052 |
|  | Convertible Promissory Note |
Fair value at December 31, 2022 |  | $ | — |
Principal borrowing |  |  | 1,121,815 |
Change in fair value of convertible promissory note |  |  | (177,697 | )
Fair value at December 31, 2023 |  | $ | 944,118 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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