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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)

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