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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2026
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Activity
The following table summarizes the Company’s restricted stock unit activity:
SharesWeighted
Average
Grant Date
Fair Value
Unvested as of December 31, 2025501,853 $64.12 
Issued171,675 295.02 
Vested(130,784)70.42 
Forfeited(19,754)118.59 
Unvested as of June 30, 2026522,990 $136.28 
Schedule of Performance Stock Activity
The following table summarizes the Company’s performance stock unit activity:
SharesGrant Date
Fair Value
Unvested as of December 31, 2025— $— 
Issued(a)
131,802 294.38 
Vested— — 
Forfeited— — 
Unvested as of June 30, 2026131,802 $294.38 
(a) The number of shares issued during the period is the maximum amount of shares that could be payable under the terms of the PSU agreement.
Schedule of Stock Option Activity
The following table summarizes the Company’s stock option activity:
Number of
Shares
Weighted
Average
Exercise Price
per Share
Weighted
Average
Remaining
Contractual
Term
Aggregate
Intrinsic Value
(In years)(In thousands)
Outstanding as of December 31, 20251,876,778 $89.80 
Granted109,647 292.60 
Exercised(74,198)72.10 $18,225 
Cancelled or Forfeited(6,823)81.11 
Outstanding as of June 30, 20261,905,404 $102.19 7.38$466,138 
Exercisable as of June 30, 20261,285,374 $104.01 6.91$319,584 
Vested and expected to vest as of June 30, 20261,905,404 $102.19 7.38$466,138 
Schedule of Fair Value of Stock Option Awards on the Grant Date Using the Black-Scholes Option Valuation Model
The weighted-average assumptions that the Company used in the Black-Scholes option pricing model to determine the grant-date fair value of stock options granted to employees and non-employees on the date of grant were as follows for the three and six months ended June 30, 2026:
Three Months Ended
June 30,
Six Months Ended June 30,
20262026
Risk-free interest rate4.26 %3.87 %
Expected term (in years)6.006.00
Expected volatility78.29 %80.09 %
Expected dividend yield— %— %
Weighted average grant-date fair value per share$187.94 $207.72 
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense was allocated as follows (in thousands):
Three Months Ended
June 30,
Six Months Ended June 30,
2026202520262025
Research and development$3,915 $3,230 $9,428 $7,010 
General and administrative7,394 4,540 18,993 9,546 
Total stock-based compensation expense$11,309 $7,770 $28,421 $16,556