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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
Allowance for uncollectible accounts receivable | $ 606 | $ 467
Accrued compensation expense | 7,414 | 5,154
Inventory differences | 1,269 | 2,505
Net operating loss carryforwards | 20,226 | 15,741
Deferred revenue | 46 | 58
Stock-based compensation expense | 2,833 | 2,281
Other | 9,243 | 8,986
Total deferred income tax assets | 41,637 | 35,192
Deferred income tax liabilities: |  |
Prepaid expenses | (1,142) | (930)
Property and equipment | (20,045) | (20,352)
Intangible assets | (58,883) | (28,588)
Foreign withholding tax | (5,590) | 0
Other | (4,350) | (1,830)
Total deferred income tax liabilities | (90,010) | (51,700)
Valuation allowance | (4,989) | (4,422)
Net deferred income tax liabilities | (53,362) | (20,930)
Reported as: |  |
Deferred income tax assets - Long-term | 3,001 | 2,359
Deferred income tax liabilities - Long-term | (56,363) | (23,289)
Net deferred income tax liabilities | $ (53,362) | $ (20,930)

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