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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Research and development tax credit carryforwards | $ 20,019 | $ 13,967
Net operating loss carryforwards | 4,918 | 4,902
Stock-based compensation | 2,793 | 4,066
Investment tax credit carryforwards | 2,181 | 1,576
Inventory reserves | 2,059 | 3,143
Vacation accrual | 1,255 | 1,928
Contingent consideration liabilities | 148 |
Unrealized loss on investments | 135 | 136
Deferred revenue | 79 | 154
Warranty reserves | 45 | 73
Bad debt reserves | 36 | 52
Alternative minimum tax credit carryforward |  | 340
Other | 273 | 331
Total deferred tax assets | 33,941 | 30,668
Less: Valuation allowance for deferred tax assets | (33,024) | (29,274)
Net deferred tax assets | 917 | 1,394
Deferred tax liabilities: |  |
Prepaid expenses | (470) | (654)
Patent amortization | (161) | (296)
Depreciation | (76) | (406)
Total deferred tax liabilities | (707) | (1,356)
Net deferred tax assets (liabilities) | $ 210 | $ 38

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