v3.26.1
Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2026
Stockholders' Equity Note [Abstract]  
Fair Value Of Each Stock Option Award
The fair value of each stock option award granted during the six months ended June 30, 2026 was estimated as of the grant date using a Black-Scholes model with the following assumptions:
Six months ended June 30, 2026
Expected term (in years)
5.7 - 6.0
Risk-free interest rate
3.9% - 4.6%
Expected volatility
109.4% - 111.8%
Expected dividend yield—
Weighted average grant date fair value per share
$0.72 - $0.82
Stock Option Activity
A summary of the stock option activity for the six months ended June 30, 2026 is presented in the table below:
Number of
Options
Weighted Average
Exercise Price
(per share)		Weighted Average
Remaining
Contractual Term
(in years)
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 202519,129,950$2.47 7.1$22 
Granted5,498,109$0.92 
Forfeited(795,058)$3.42 
Outstanding at June 30, 202623,833,001$2.08 7.4$70 
Options exercisable at June 30, 202612,593,718$2.55 6.5$— 
Vested and expected to vest at June 30, 202623,833,001$2.08 7.4$70 
RSU Activity
A summary of the RSU activity for the six months ended June 30, 2026 is presented in the table below:
Number
of Shares
Underlying
RSUs
Weighted
Average
Grant-Date
Fair Value
Outstanding non-vested RSUs at December 31, 202511,118,391$1.29 
Granted8,939,509$0.97 
Vested(2,515,139)$1.28 
Forfeited
(713,996)$1.21 
Outstanding non-vested RSUs at June 30, 202616,828,765$1.13 
Stock-Based Compensation Stock-based compensation expense for the three and six months ended June 30, 2026 and 2025 was allocated as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2026202520262025
Research and development$705 $810 $1,345 $1,406 
Selling, general and administrative2,345 2,086 4,270 3,852 
   Total stock-based compensation
$3,050 $2,896 $5,615 $5,258