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Income Taxes - Schedule of Temporary Differences Between Basis of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 33,275 | $ 21,248 |
Tax credit carryforwards | 4,365 | 3,038 |
Accrued expenses | 103 | 32 |
Property and equipment |  | 390 |
Deferred rent | 2,209 | 53 |
Equity compensation | 784 | 503 |
Amortizable intangibles | 1,339 | 1,492 |
Other | 78 |  |
Gross deferred tax assets | 42,153 | 26,756 |
Deferred tax liability: |  |  |
Other |  | (241) |
Property and equipment | (1,863) |  |
Valuation allowance | $ (40,290) | $ (26,515) | $ (13,060)

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