v3.25.1
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Stock-based Compensation Expense and Related Income Tax Benefit Stock-based compensation expense by statement of operations caption and the related income tax benefit were as follows:
Three Months Ended March 31,
(In thousands)20252024
Cost of sales$16 $27 
Research and development expenses158 231 
Selling, general and administrative expenses:
Employees
1,276 1,551 
Outside directors
334 95 
Total employee and director stock-based compensation expense$1,784 $1,904 
Income tax benefit$247 $287 
Non-Vested Restricted Stock Award Activity
Non-vested restricted stock award activity was as follows:
Shares
(in thousands)		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2024
595 $13.07 
Granted— — 
Vested(106)20.91 
Forfeited(1)10.68 
Non-vested at March 31, 2025
488 $11.38 
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
Non-vested performance stock award activity was as follows:
Shares
(in thousands)		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2024
116 $4.72 
Granted— — 
Vested— — 
Forfeited— — 
Non-vested at March 31, 2025
116 $4.72 

The assumptions we utilized in the Monte Carlo simulation model and the resulting weighted average fair value of performance stock grants were the following:
 Three Months Ended March 31,
 20252024
Weighted average fair value of grants$— $4.72 
Risk-free interest rate— %4.08 %
Expected volatility— %57.00 %
Expected life in years0.002.73
Stock Option Activity
Stock option activity was as follows:    
Number of Options
(in thousands)		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 2024
779 $35.67 
Granted— — 
Exercised— — $— 
Forfeited/canceled/expired(88)44.95 
Outstanding at March 31, 2025 (1)
691 $34.50 3.25$— 
Vested and expected to vest at March 31, 2025 (1)
691 $34.50 3.25$— 
Exercisable at March 31, 2025 (1)
612 $35.73 3.02$— 
(1)The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of the first quarter of 2025 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on March 31, 2025. This amount will change based on the fair market value of our stock.