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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Deferred tax assets: |  |
Research and development tax credit carryforwards | $ 27,607,000 | $ 23,244,000
Investment tax credit carryforwards | 2,102,000 | 1,976,000
Stock-based compensation | 1,587,000 | 3,133,000
Inventory reserves | 1,522,000 | 2,109,000
Vacation accrual | 1,280,000 | 1,218,000
Deferred revenue, net | 796,000 | 66,000
Lease liabilities | 679,000 |
UNICAP | 351,000 | 275,000
Net operating loss carryforwards | 328,000 | 1,091,000
International deferred tax assets | 205,000 | 265,000
Sales allowances | 172,000 | 128,000
Unrealized loss on investments | 132,000 | 132,000
Contingent consideration liabilities | 98,000 | 88,000
Warranty reserves | 66,000 | 35,000
Bad debt reserves | 14,000 | 52,000
Other | 225,000 | 233,000
Total deferred tax assets | 37,164,000 | 34,045,000
Less: Valuation allowance for deferred tax assets | (30,363,000) | (30,031,000)
Net deferred tax assets | 6,801,000 | 4,014,000
Deferred tax liabilities: |  |
Depreciation | (5,296,000) | (3,144,000)
ROU assets | (653,000) |
Prepaid expenses | (552,000) | (473,000)
Patent amortization | (91,000) | (107,000)
Other | (4,000) | (25,000)
Total deferred tax liabilities | (6,596,000) | (3,749,000)
Net deferred tax assets (liabilities) | $ 205,000 | $ 265,000

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