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Gross Amounts and Dates of Expiration of Tax Credits and Carryovers (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | $ 571,992 |
California loss carryovers | 59,752 |
Research credits | 26,705 | $ 25,061
Federal foreign tax credits | 610 |
Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 18,631 |
California |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 10,220 |
Expires 2019-2021 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 66,880 |
Expires 2019-2021 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 5,269 |
Expires 2022-2028 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 171,270 |
Federal foreign tax credits | 610 |
Expires 2022-2028 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 7,626 |
Expires 2029-2038 |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 273,585 |
California loss carryovers | 59,752 |
Expires 2029-2038 | Federal |  |
Income Tax Disclosure [Line Items] |  |
Research credits | 5,736 |
No Expiration |  |
Income Tax Disclosure [Line Items] |  |
Federal losses carryovers | 60,257 |
No Expiration | California |  |
Income Tax Disclosure [Line Items] |  |
Research credits | $ 10,220 |

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