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Income Taxes - Schedule of Temporary Differences Between Basis of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 76,802 | $ 61,181 |
Tax credit carryforwards | 7,248 | 5,748 |
Accrued expenses | 181 | 126 |
Property and equipment | 591 | 279 |
Lease liabilities | 5,618 | 6,230 |
Equity compensation | 2,396 | 2,200 |
Amortizable intangibles | 1,197 | 1,195 |
Other | 238 | 74 |
Gross deferred tax assets | 94,271 | 77,033 |
Deferred tax liabilities: |  |  |
Right of use assets | (3,794) | (4,242) |
Gross deferred tax liabilities | (3,794) | (4,242) |
Valuation allowance | $ (90,477) | $ (72,791) | $ (53,834)

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