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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Research and development tax credit carryforwards | $ 23,244 | $ 20,019
Stock-based compensation | 3,133 | 2,793
Inventory reserves | 2,109 | 2,059
Investment tax credit carryforwards | 1,976 | 2,181
Vacation accrual | 1,218 | 1,255
Net operating loss carryforwards | 1,091 | 4,918
UNICAP | 275 | 3
International deferred tax assets | 265 | 210
Unrealized loss on investments | 132 | 135
Sales allowances | 128 | 25
Contingent consideration liabilities | 88 | 148
Deferred revenue | 66 | 79
Bad debt reserves | 52 | 36
Warranty reserves | 35 | 45
Other | 233 | 35
Total deferred tax assets | 34,045 | 33,941
Less: Valuation allowance for deferred tax assets | (30,031) | (33,024)
Net deferred tax assets | 4,014 | 917
Deferred tax liabilities: |  |
Depreciation | (3,144) | (76)
Prepaid expenses | (473) | (470)
Patent amortization | (107) | (161)
Other | (25) |
Total deferred tax liabilities | (3,749) | (707)
Net deferred tax assets (liabilities) | $ 265 | $ 210

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