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Income Taxes - Schedule of Temporary Differences Between Basis of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 46,362 | $ 33,275 |
Tax credit carryforwards | 4,262 | 4,365 |
Accrued expenses | 37 | 103 |
Deferred rent |  | 2,209 |
Lease liabilities | 6,776 |  |
Equity compensation | 1,481 | 784 |
Amortizable intangibles | 1,214 | 1,339 |
Other | 138 | 78 |
Gross deferred tax assets | 60,270 | 42,153 |
Deferred tax liabilities: |  |  |
Property and equipment | (1,720) | (1,863) |
Right of use assets | (4,716) |  |
Gross deferred tax liabilities | (6,436) | (1,863) |
Valuation allowance | $ (53,834) | $ (40,290) | $ (26,515)

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