Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Less valuation allowance	$ 146,423,000	$ 121,627,000
Unrecognized tax benefits	11,800,000
Accrual interest and penalties	$ 0	$ 0
Minimum
Income Tax Disclosure [Line Items]
Income tax realization	50.00%
California
Income Tax Disclosure [Line Items]
NOL carryforwards subject to expiration	$ 171,800,000
Federal
Income Tax Disclosure [Line Items]
NOL carry forwards amount	301,200,000
NOL carryforwards not subject to expiration	112,100,000
NOL carryforwards subject to expiration	189,100,000
Federal | Research Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Tax credit carryforward, amount	12,900,000
State and Local
Income Tax Disclosure [Line Items]
NOL carry forwards amount	291,000,000.0
California | Research Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Tax credit carryforward, amount	$ 15,500,000