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Income Taxes - Income Taxes Effect of Each Type of Temporary Difference Comprising Net Differed Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 154,086 | $ 136,862 |
Stock-based compensation | 9,929 | 11,616 |
Tax credits | 2,409 | 2,639 |
Capitalized R&D |  | 4,723 |
Lease liability | 1,971 | 2,583 |
Other reserves and accrued liabilities | 7,916 | 11,895 |
Gross deferred tax assets | 176,311 | 170,318 |
Less: valuation allowance | (171,793) | (165,378) | $ (160,295)
Total deferred tax assets | 4,518 | 4,940 |
Deferred tax liabilities: |  |  |
Depreciation and amortization | (3,050) | (3,337) |
Lease asset | (1,468) | (1,603) |
Total deferred tax liabilities | (4,518) | (4,940) |
Net deferred tax assets | $ 0 | $ 0 |

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