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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Stock-based compensation expense for each employee and director is presented in the same statement of operations caption as their cash compensation. Stock-based compensation expense by statement of operations caption and the related income tax benefit were as follows: 
Year Ended December 31,
(In thousands)202420232022
Cost of sales$106 $125 $155 
Research and development expenses769 1,098 1,342 
Selling, general and administrative expenses:
Employees
5,379 6,980 7,257 
Outside directors
446 606 1,259 
Total employee and director stock-based compensation expense$6,700 $8,809 $10,013 
Income tax benefit$1,026 $1,369 $1,660 
Restricted Stock

Non-vested restricted stock award activity was as follows:
202420232022
Shares
(in 000's)		Weighted-Average
Grant Date
Fair Value		Shares
(in 000's)		Weighted-Average
Grant Date
Fair Value		Shares
(in 000's)		Weighted-Average
Grant Date
Fair Value
Non-vested at beginning of the year486 $21.66 376 $36.82 310 $44.41 
Granted391 10.55 340 14.15 262 31.05 
Vested(264)24.85 (211)35.77 (191)41.09 
Forfeited(18)17.40 (19)17.72 (5)43.22 
Non-vested at end of the year595 $13.07 486 $21.66 376 $36.82 

As of December 31, 2024, we expect to recognize $5.1 million of total unrecognized pre-tax stock-based compensation expense related to non-vested restricted stock awards over a weighted-average life of 1.6 years.

Performance Stock

Non-vested performance stock award activity was as follows:
Shares
(in 000s)		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2023
— $— 
Granted116 4.72 
Vested— — 
Forfeited— — 
Non-vested at December 31, 2024
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:
 Year Ended December 31,
 2024
Weighted average fair value of grants$4.72 
Risk-free interest rate4.08 %
Expected volatility57.00 %
Expected life in years2.73

As of December 31, 2024, we expect to recognize $0.4 million of total unrecognized pre-tax stock-based compensation expense related to non-vested performance stock awards over a weighted-average life of 1.8 years.
Stock Options

Stock option activity was as follows:
202420232022
Number of Options
(in 000's)		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in 000's)		Number of Options
(in 000's)		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in 000's)		Number of Options
(in 000's)		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
(in 000's)
Outstanding at beginning of the year901 $38.78 782 $44.16 800 $45.55 
Granted— — 235 24.77 139 33.42 
Exercised— — $— — — $— (80)19.25 $292 
Forfeited/canceled/expired(122)58.52 (116)46.59 (77)64.81 
Outstanding at end of the year (1)
779 $35.67 3.12$— 901 $38.78 3.67$— 782 $44.16 3.45$— 
Vested and expected to vest at the end of the year (1)
779 $35.67 3.12$— 901 $38.78 3.67$— 782 $44.16 3.45$— 
Exercisable at the end of the year (1)
673 $37.24 2.79$— 620 $44.06 2.60$— 600 $45.77 2.61$— 
(1)The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2024, 2023 and 2022 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 December 31, 2024, 2023 and 2022. This amount will change based on the fair market value of our stock.

There were no option exercises in the years ended December 31, 2024 and 2023. The value of shares withheld in lieu of receiving cash from option exercises in the year ended December 31, 2022 was $1.5 million. There was no cash received from option exercises for the year ended December 31, 2022. The actual tax benefit realized from option exercises was $0.1 million for the year ended December 31, 2022.

The assumptions we utilized in the Black-Scholes option pricing model and the resulting weighted average fair value of stock option grants were the following:
 Year Ended December 31,
 202420232022
Weighted average fair value of grants$— $10.83 $14.51 
Risk-free interest rate— %3.86 %1.93 %
Expected volatility— %45.89 %49.35 %
Expected life in years0.004.704.73

Significant option groups outstanding at December 31, 2024 and the related weighted average exercise price and life information were as follows:
 Options OutstandingOptions Exercisable
Range of Exercise PricesNumber
Outstanding
(in 000's)		Weighted-Average
Remaining 
Contractual Term (in years)		Weighted-Average
Exercise Price		Number
Exercisable
(in 000's)		Weighted-Average
Exercise Price
$24.77 to $34.56
497 3.78$27.69 391 $28.23 
$44.95 to $46.17
188 1.1845.60 188 45.60 
$52.85 to $59.43
94 3.4858.03 94 58.03 
779 3.12$35.67 673 $37.24 
    
As of December 31, 2024, we expect to recognize $1.0 million of total unrecognized pre-tax stock-based compensation expense related to non-vested stock options over a remaining weighted-average life of 1.0 year.

Stock Incentive Plans

Our active stock-based incentive plans include those adopted in 2014 and 2018 ("Stock Incentive Plans"). Under the Stock Incentive Plans, we may grant restricted stock units, performance stock units, stock options, stock appreciation rights, or any combination thereof for a period of ten years from the approval date of each respective plan, unless the plan is terminated by resolution of our Board of Directors. No stock appreciation rights have been awarded under our Stock Incentive Plans as of December 31, 2024. Only directors and employees meeting certain employment qualifications are eligible to receive stock-based awards.

The grant price of restricted stock and stock option awards granted under our Stock Incentive Plans is the average of the high and low trades of our stock on the grant date. We prohibit the re-pricing or backdating of stock options. Restricted stock awards vest in various proportions over a one- to three-year time period. Our stock options become exercisable in various proportions over a three-year time frame. Stock options have a maximum ten-year term. Our performance stock awards vest in various proportions over a three-year term, subject to a service condition and stock price-based market conditions.

Detailed information regarding our active Stock Incentive Plans was as follows at December 31, 2024:
NameApproval DateTotal Shares
Available for Grant
Under the Plan		Remaining Shares
Available for Grant
Under the Plan		Outstanding Shares
Granted
Under the Plan
2014 Stock Incentive Plan6/12/20141,100,000 — 87,660 
Amended and Restated 2018 Equity and Incentive Compensation Plan (1)
6/11/20243,391,794 970,387 1,402,148 
970,387 1,489,808 
(1)The 2018 Equity and Incentive Compensation Plan, as amended on June 8, 2021, was amended and restated on June 11, 2024 to create the Amended and Restated 2018 Equity and Incentive Compensation Plan which added an additional 1,000,000 shares.