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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 Model 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 input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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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 derivative liabilities at fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + 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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