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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
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 June 30,Six Months Ended June 30,
(In thousands)2023202220232022
Cost of sales$26 $40 $62 $79 
Research and development expenses251 345 534 678 
Selling, general and administrative expenses:
Employees
1,666 1,852 3,672 3,579 
Outside directors
215 400 430 800 
Total employee and director stock-based compensation expense$2,158 $2,637 $4,698 $5,136 
Income tax benefit$209 $440 $480 $868 
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, 2022
782 $44.16 
Granted236 24.77 
Exercised— — $— 
Forfeited/canceled/expired(93)51.39 
Outstanding at June 30, 2023 (1)
925 $38.49 4.23$— 
Vested and expected to vest at June 30, 2023 (1)
925 $38.49 4.23$— 
Exercisable at June 30, 2023 (1)
581 $44.26 2.92$— 
(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 second quarter of 2023 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 June 30, 2023. This amount will change based on the fair market value of our stock.
Assumptions Used in Valuation and Weighted Average Fair Value of Stock Option Grants
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:
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Weighted average fair value of grants$— $— $10.83 $14.87 
Risk-free interest rate— %— %3.86 %1.78 %
Expected volatility— %— %45.89 %49.42 %
Expected life in years0.000.004.704.65
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, 2022
$376 $36.82 
Granted300 14.74 
Vested(181)37.11 
Forfeited(4)37.47 
Non-vested at June 30, 2023
$491 $23.21