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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |
Provision for income taxes | $ 1,143,000 | $ 808,000 | $ 0
Increase (decrease) in valuation allowance | 300,000 | 86,800,000 |
Net operating loss carryforwards | 353,500,000 |  |
Unrecognized tax benefits | 11,339,000 | 5,615,000 | $ 10,565,000
Unrecognized tax benefits would affect the effective tax rate | 0 |  |
Interest related to unrecognized tax benefits | 0 | 0 |
Penalties related to unrecognized tax benefits | 0 | $ 200,000 |
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 96,300,000 |  |
Federal | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2023 |  |
Federal | Research And Development Tax Credits |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | $ 26,200,000 |  |
Federal | Research And Development Tax Credits | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2023 |  |
Federal | Research And Development Tax Credits | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2042 |  |
California and Other States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 308,800,000 |  |
California and Other States | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2023 |  |
California and Other States | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2040 |  |
California State | Research And Development Tax Credits |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | $ 22,100,000 |  |
Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 700,000 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
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