v3.25.1
Debt
3 Months Ended
Mar. 31, 2025
Debt  
Debt

5     Debt

On March 29, 2023, we closed the transactions contemplated by a note purchase agreement, or the “Note Purchase Agreement,” with RTW Investments LP and certain of its affiliates, or collectively, “RTW,” and issued and sold $50.0 million principal amount of 6.0% Convertible Senior Notes due 2029, or the “2029 Convertible Notes,” to the holders. For more details on the agreement with RTW, see Note 10 to our audited consolidated financial statements for the year ended December 31, 2024, filed on Form 10-K.

In accounting for the issuance of the 2029 Convertible Notes, the Company determined there were no embedded features, which require bifurcation between debt and equity components. As a result, the 2029 Convertible Notes are accounted for as a liability. As of March 31, 2025, the estimated fair value of the Convertible Notes was approximately $47.6 million based on level 2 inputs.

The net carrying amount of the Convertible Note were as follows:

    

March 31, 2025

December 31, 2024

Original principal

 

$

50,000

$

50,000

Paid in kind (PIK) interest

6,352

5,520

Unamortized debt discount

(445)

(468)

Unamortized debt issuance costs

 

(1,620)

(1,700)

Total

 

$

54,287

$

53,352

The following table presents the total amount of interest cost recognized relating to the 2029 Convertible Notes:

Three months ended March 31, 

    

2025

    

2024

Contractual interest expense

$

832

 

$

785

Amortization of debt discount

23

18

Amortization of debt issuance costs

80

 

69

Total interest expense

$

935

 

$

872