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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