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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Allowance for credit losses on trade receivables | $ 1,198 | $ 693
Accrued compensation expense | 9,694 | 9,244
Inventory differences | 3,161 | 2,207
Net operating loss carryforwards | 18,622 | 21,187
Deferred revenue | 617 | 552
Stock-based compensation expense | 7,360 | 4,672
Operating lease assets | 15,182 | 16,838
Federal R&D tax credit | 3,607 | 1,376
Other | 13,993 | 6,189
Total deferred income tax assets | 73,434 | 62,958
Deferred income tax liabilities: |  |
Prepaid expenses | (1,078) | (1,128)
Property and equipment | (20,671) | (21,242)
Intangible assets | (47,178) | (53,933)
Foreign withholding tax | (5,358) | (5,240)
Operating lease liabilities | (13,855) | (15,847)
Other | (3,796) | (2,372)
Total deferred income tax liabilities | (91,936) | (99,762)
Valuation allowance | (10,213) | (4,644)
Net deferred income tax liabilities | (28,715) | (41,448)
Reported as: |  |
Deferred income tax assets | 4,597 | 3,788
Deferred income tax liabilities | (33,312) | (45,236)
Net deferred income tax liabilities | $ (28,715) | $ (41,448)

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