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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax assets: |  |
Allowance for uncollectible accounts receivable | $ 645 | $ 531
Accrued compensation expense | 6,203 | 5,534
Inventory differences | 1,065 | 2,043
Net operating loss carryforwards | 27,742 | 11,434
Deferred revenue | 73 | 118
Stock-based compensation expense | 2,738 | 2,532
Federal research and development credit carryforward | 3,524 | 2,355
Foreign tax credits | 364 | 600
Other | 6,984 | 5,754
Total deferred income tax assets | 49,338 | 30,901
Deferred income tax liabilities: |  |
Prepaid expenses | (782) | (841)
Property and equipment | (25,108) | (24,467)
Intangible assets | (35,773) | (6,495)
Other | (1,480) | (1,077)
Total deferred income tax liabilities | (63,143) | (32,880)
Valuation allowance | (3,786) | (1,981)
Net deferred income tax liabilities | (17,591) | (3,960)
Reported as: |  |
Deferred income tax assets - Current | 8,219 | 7,025
Deferred income tax assets - Long-term | 171 | 0
Deferred income tax liabilities - Current | 0 | 0
Deferred income tax liabilities - Long-term | (25,981) | (10,985)
Net deferred income tax liabilities | $ (17,591) | $ (3,960)

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