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Stock-Based Compensation Plans
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Stock-Based Compensation Plans Stock-Based Compensation Plans
The components of stock-based compensation expense were as follows:
Three months ended March 31,
20252024
(in thousands)
2023 Incentive Stock Plan$6,858 $3,799 
Employee Stock Purchase Plan49 14 
Total Stock Compensation Expense$6,907 $3,813 

Under the 2023 Incentive Stock Plan (the “2023 Plan”), stock-based compensation is in the form of restricted stock awards (“RSAs”). The RSAs are subject to either service-based vesting, which is typically between one and four years, in which a specific period of continued employment must pass before an award vests, or performance-based vesting, which is typically between one and three years. The expense associated with these awards is recognized on a straight-line basis over the respective vesting period, with forfeitures accounted for as they occur. For any vesting tranche of an award, the cumulative amount of compensation cost recognized is equal to the portion of the grant‑date fair value of the award tranche that is actually vested at that date.

As of March 31, 2025, the Company had granted 2,250,867 RSAs under the 2023 Plan and had 1,393,729 shares available for future issuance. The fair value of the RSAs equaled the stock price at the grant date.

The following table summarizes the restricted stock activity during the three months ended March 31, 2025:
Shares
Balance of unvested shares as of December 31, 2024569,425 
Shares granted198,613 
Shares forfeited— 
Shares vested(1,250)
Balance of unvested shares as of March 31, 2025766,788 

Under the Employee Stock Purchase Plan (“ESPP”), as amended and restated effective November 2021, 425,000 shares of common stock have been reserved for issuance. Eligible employees may designate no more than 10% of their base cash compensation to be deducted each pay period for the purchase of common stock under the ESPP. Participants may purchase the lesser of 1,000 shares or $25,000 of common stock in any one calendar year. Each January 31 and July 31, shares of common stock are purchased with the employees’ payroll deductions from the immediately preceding six months at a price per share of 85% of the lesser of the market price of the common stock on the purchase date or the market price of the common stock on the date of entry into an offering period. During the three months ended March 31, 2025 and 2024, 1,531 and 5,532 shares of common stock, respectively, were issued under the ESPP. The Company issues new shares through its transfer agent upon an employee stock purchase.