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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets:    
Allowance for credit losses on trade receivables $ 1,494 $ 1,198
Accrued compensation expense 11,063 9,694
Inventory differences 4,887 3,161
Net operating loss carryforwards 14,833 18,622
Stock-based compensation expense 6,388 7,360
Operating lease assets 13,431 15,182
Federal R&D tax credit 5,003 3,607
UT R&D Credit 4,126 3,484
Other 9,939 11,126
Total deferred income tax assets 71,164 73,434
Deferred income tax liabilities:    
Prepaid expenses (1,047) (1,078)
Property and equipment (20,797) (20,671)
Intangible assets (42,888) (47,178)
Foreign withholding tax (5,575) (5,358)
Operating lease liabilities (11,938) (13,855)
Other (3,556) (3,796)
Total deferred income tax liabilities (85,801) (91,936)
Valuation allowance (10,786) (10,213)
Net deferred income tax liabilities (25,423) (28,715)
Reported as:    
Deferred income tax assets 6,080 4,597
Deferred income tax liabilities (31,503) (33,312)
Net deferred income tax liabilities $ (25,423) $ (28,715)