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Difference Between Provision for Income Taxes and Amounts Computed by Applying Federal Statutory Income Tax Rate to Loss before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax | $ (7,838) | $ (8,891) | $ (11,352)
Federal research credits | (1,065) | (1,874) | (2,159)
State research credits | (642) | (822) | (767)
Expiration of federal carryovers | 7,284 | 4,858 | 4,651
Change in valuation allowance | 1,361 | 6,379 | 10,482
Compensation related items | 3,257 | 1,794 | 460
State taxes | (1,710) | (1,127) | (1,294)
Revision to prior year items | (664) |  |
Other | 342 | 171 | 298
Provision for income taxes | $ 325 | $ 488 | $ 319

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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