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Gross Amounts and Dates of Expiration of Tax Credits and Carryovers (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | $ 616,915 |
California loss carryovers | 67,781 |
Research credits | 28,291 | $ 26,705
Federal foreign tax credits | 610 |
Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 19,397 |
California |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 11,259 |
Expires 2020-2022 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 64,730 |
Expires 2020-2022 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 6,928 |
Expires 2023-2029 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 186,421 |
California loss carryovers | 14,732 |
Federal foreign tax credits | 610 |
Expires 2023-2029 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 4,875 |
Expires 2030-2039 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 239,731 |
California loss carryovers | 53,049 |
Expires 2030-2039 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 7,594 |
No Expiration |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 126,033 |
No Expiration | California |  |
Income Tax Disclosure [Line Items] |  |
Research credits | $ 11,259 |

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