v3.26.1
Share-based compensation (Tables)
3 Months Ended
Mar. 31, 2026
Equity [Abstract]  
Summary of Share-based Compensation Expense

Share-based compensation expense was as follows for the three months ended March 31, 2026 and 2025 (in thousands):

 

 

 

 

Three months ended
March 31,

 

 

 

 

2026

 

 

2025

 

Research and development

 

 

$

 

 

$

15

 

General and administrative

 

 

 

78

 

 

 

122

 

 

 

$

78

 

 

$

137

 

Summary of Activity Related to Stock Option Grants

The following table summarizes the activity related to stock option grants for the three months ended March 31, 2026:

 

 

 

Shares

 

 

Weighted
average
exercise
price per
share

 

 

Weighted-
average
remaining
contractual
life (years)

 

Outstanding at January 1, 2026

 

 

10,969,734

 

 

$

1.27

 

 

 

8.2

 

Granted

 

 

 

 

 

 

 

 

 

Forfeited/Expired

 

 

(370,675

)

 

 

2.43

 

 

 

 

Outstanding at March 31, 2026

 

 

10,599,059

 

 

$

1.23

 

 

 

8.2

 

Vested and exercisable at March 31, 2026

 

 

3,878,171

 

 

$

3.28

 

 

 

6.9

 

Vested and expected to vest at March 31, 2026

 

 

10,599,059

 

 

$

1.23

 

 

 

8.2

 

Summary of Fair Value of Each Option Grant Estimated Throughout Year Using Black-Scholes Option-pricing Model There were no options granted during the three months ended March 31, 2026.

 

 

 

Three months ended
March 31,

 

 

 

2025

 

Expected term (in years)

 

 

5.7

 

Expected stock price volatility

 

 

96.6

%

Risk-free interest rate

 

 

4.26

%

Expected dividend yield

 

 

0

%