Gross Amounts and Dates of Expiration of Tax Credits and Carryovers (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Federal losses carryovers	$ 616,922
California loss carryovers	75,192
Other state loss carryovers	37,687
Research credits	29,242	$ 29,411
Federal foreign tax credits	610
Federal
Income Tax Disclosure [Line Items]
Research credits	18,036
California
Income Tax Disclosure [Line Items]
Research credits	14,186
Expires 2023-2025
Income Tax Disclosure [Line Items]
Federal losses carryovers	69,647
Other state loss carryovers	601
Expires 2023-2025 | Federal
Income Tax Disclosure [Line Items]
Research credits	3,758
Expires 2026-2032
Income Tax Disclosure [Line Items]
Federal losses carryovers	186,833
California loss carryovers	46,641
Other state loss carryovers	364
Federal foreign tax credits	610
Expires 2026-2032 | Federal
Income Tax Disclosure [Line Items]
Research credits	1,483
Expires 2033-2042
Income Tax Disclosure [Line Items]
Federal losses carryovers	169,673
California loss carryovers	28,551
Other state loss carryovers	36,722
Expires 2033-2042 | Federal
Income Tax Disclosure [Line Items]
Research credits	12,795
No Expiration
Income Tax Disclosure [Line Items]
Federal losses carryovers	190,769
No Expiration | California
Income Tax Disclosure [Line Items]
Research credits	$ 14,186