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Taxes - Constituents of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Non-current deferred tax assets: |  |
Stock-based compensation expense | $ 13,818 | $ 11,664
Federal and state tax credit carryforwards | 7,395 | 6,707
Bonuses, commissions, and other compensation | 5,470 | 5,704
Inventory and revenue related | 3,233 | 3,415
Depreciation | 2,475 | 2,279
Other | 2,425 | 3,012
Gross non-current deferred tax assets | 34,816 | 32,781
Non-current deferred tax liabilities: |  |
Nondeductible intangible assets | (44) | (87)
Gross non-current deferred tax liabilities | (44) | (87)
Valuation allowance | (6,112) | (5,309)
Net non-current deferred tax assets | 28,660 | 27,385
Non-current deferred tax liabilities: |  |
Other | (962) | (312)
Net non-current deferred tax liabilities | $ 962 | $ 312

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