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Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Inventory reserves | $ 1,104 | $ 1,396
Capitalized research costs | 23 | 44
Capitalized inventory costs | 609 | 704
Net operating losses | 999 | 485
Acquired intangible assets | 287 | 136
Accrued liabilities | 1,239 | 4,739
Income tax credits | 8,861 | 12,509
Stock-based compensation | 2,712 | 3,376
Amortization of intangible assets | 526 | 0
Total deferred tax assets | 16,360 | 23,389
Deferred tax liabilities: |  |
Depreciation | (944) | (2,924)
Allowance for doubtful accounts | (444) | (241)
Amortization of intangible assets | 0 | (780)
Other | (2,680) | (1,479)
Total deferred tax liabilities | (4,068) | (5,424)
Net deferred tax assets before valuation allowance | 12,292 | 17,965
Less: Valuation allowance | (8,802) | (8,635)
Net deferred tax assets | $ 3,490 | $ 9,330

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