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Debt (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Debt [Abstract]

Schedule of Changes in Debt Instruments

The following table sets forth a summary of the debt instruments and their changes during the six months ended June 31, 2025 and 2024 (in thousands):

		Convertible Notes				Tasly Convertible Debt				Senior Notes				Promissory Notes				PPP Loan
Balance at January 1, 2025		$	18,419			$	2,234			$	25,268			$	910			$	1,376
Issuance of debt			—				—				1,450				—				—
Debt repayments			—				—				—				—				—
Change in fair value			—				118				—				—				—
Stated interest			1,098				191				1,176				30				7
Amortization of debt discount and issuance costs			16				—				1				—				—
Balance at June 30, 2025		$	19,533			$	2,543			$	27,895			$	940			$	1,383
Less: Current portion			19,533				2,543				27,895				940				1,383
Long term debt		$	—			$	—			$	—			$	—			$	—

		Convertible Notes				Tasly Convertible Debt				Senior Notes				Promissory Notes				PPP Loan
Balance at December 31, 2023		$	16,316			$	1,714			$	20,155			$	849			$	1,362
Issuance of debt			—				16				1,120				—				—
Debt repayments			—				—				(115	)			—				—
Change in fair value			—				11				—				—				—
Stated interest			993				97				994				31				7
Amortization of debt discount and issuance costs			39				—				—				—				—
Balance at June 30, 2024		$	17,348			$	1,838			$	22,154			$	880			$	1,369
Long term debt		$	—			$	—			$	—			$	—			$	—

The following table sets forth a summary of the debt instruments (which are all classified as current liabilities in the accompanying consolidated balance sheets and their changes during the years ended December 31, 2024 and 2023 (in thousands):

		Convertible Notes				Tasly Convertible Debt				Senior Notes				Promissory Notes				PPP Loan
Balance at January 1, 2023		$	13,981			$	—			$	15,149			$	576			$	1,326
Issuance of debt			—				1,600				3,235				375				—
Debt repayments			—				—				—				(151	)			—
Change in fair value			—				22				—				—				—
Stated interest			1,820				92				1,771				49				36
Amortization of debt discount and issuance costs			515				—				(0	)			—				—
Balance at December 31, 2023			16,316				1,714				20,155				849				1,362
Balance at January 1, 2024		$	16,316			$	1,714			$	20,155			$	849			$	1,362
Issuance of debt			—				16				3,210				—				—
Debt repayments			—				—				(150	)			—				—
Change in fair value			—				311				—				—				—
Stated interest			2,057				193				2,053				61				14
Amortization of debt discount and issuance costs			46				—				—				—				—
Balance at December 31, 2024		$	18,419			$	2,234			$	25,268			$	910			$	1,376
Less: Current portion			18,419				2,234				25,268				910				1,376
Long term debt		$	—			$	—			$	—			$	—			$	—

Schedule of Future Minimum Payments for the Convertible Notes Payable

As of June 30, 2025, future minimum payments for the convertible notes payable were as follows (in thousands):

		Convertible Notes				Tasly Convertible Debt				Senior Notes
As of June 30, 2025		$	19,603			$	2,287			$	26,003
Total future payments			19,603				2,287				26,003
Less: fair value remeasurement			—				451				—
Less: unamortized debt discount			—				—				1,967
Less: interest			(70	)			(195	)			(75	)
Total convertible notes payable		$	19,533			$	2,543			$	27,895

As of December 31, 2024, future minimum payments for the convertible notes payable were as follows (in thousands):

		Convertible Notes				Tasly Convertible Debt				Senior Notes
Total future principal payments		$	19,533			$	1,998			$	24,396
Add: fair value remeasurement			—				333				—
Add (less): unamortized debt (premium) discount			(2	)			—				2,055
Less: interest			(1,112	)			(97	)			(1,183	)
Total convertible notes payable		$	18,419			$	2,234			$	25,268

Schedule of Contractual Future Minimum Payments for the PPP Loan

As of June 30, 2025, the contractual future minimum payments for the PPP Loan 2 were as follows (in thousands):

Year Ending December 31,		Amount
2025 (remainder)			1,245
2026			145
Total		$	1,390

As of December 31, 2024, the contractual future minimum payments for the PPP Loan 2 were as follows (in thousands):

Year Ending December 31,		Amount
2025			1,231
2026			145
Total		$	1,376

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