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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax asset:    
Capitalized research expenditures $ 54,931 $ 55,277
Retirement plan 14,185 13,633
Tax credit carry forwards 9,628 9,542
Accruals and reserves 7,100 6,988
Lease liabilities 5,874 6,073
Stock-based compensation 1,701 1,475
Deferred revenue 588 655
Other 3,706 2,783
Deferred Tax Assets, Gross 97,713 96,426
Valuation allowance (9,159) (10,167)
Deferred tax assets 88,554 86,259
Deferred tax liability:    
Lease Assets (4,891) (5,297)
Acquisition goodwill (2,088) (1,854)
Other (2,121) (788)
Deferred tax liabilities (9,100) (7,939)
Net deferred tax assets $ 79,454 $ 78,320