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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |
Income tax expense | $ 0 | $ 0 | $ 0
Increase (decrease) in valuation allowance | 22,300,000 | 40,400,000 |
Unrecognized tax benefits | 10,322,000 | $ 1,229,000 |
Unrecognized tax benefits would affect the effective tax rate | 0 |  |
Interest related to unrecognized tax benefits | 0 |  |
Penalties related to unrecognized tax benefits | 0 |  |
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 887,300,000 |  |
Federal | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2020 |  |
Federal | Research And Development Tax Credits |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | $ 21,700,000 |  |
Federal | Research And Development Tax Credits | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2020 |  |
Federal | Research And Development Tax Credits | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount, expiration year | 2039 |  |
California and Other States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 318,300,000 |  |
California and Other States | Minimum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2020 |  |
California and Other States | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards, expiration year | 2039 |  |
California State | Research And Development Tax Credits |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward amount | $ 19,600,000 |  |
Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 9,000,000.0 |  |

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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 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: 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 http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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