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Income Taxes - Schedule of Significant Components Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 5,151 | $ 9,947
Research and development tax credits | 705 | 506
Accruals and reserves | 14 | 43
Stock compensation | 802 | 391
Depreciation and amortization | 1,905 | 116
Lease liability | 30 | 68
Total deferred tax assets | 8,607 | 11,071
Right-of-use asset | (29) | (66)
Acquired IPR&D | (6,801) |
Total deferred tax liabilities | (6,830) | (66)
Less: valuation allowance | (5,883) | $ (11,005)
Net deferred tax liabilities | $ (4,106) |

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