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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Jun. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2007
Income Tax [Line Items]          
Increase (decrease) in valuation allowance   $ (6,900,000) $ 17,200,000    
Gross federal R&D tax credit-related deferred tax assets derecognized   15,200,000      
Unrecognized tax benefit   2,955,000 1,871,000 $ 1,573,000  
Tax-related penalties or interest recognized   0 0    
Uncertain tax positions   0 $ 0    
Federal Income Tax          
Income Tax [Line Items]          
Net operating loss carryforwards   $ 140,400,000     $ 156,300,000
Net operating loss carryforwards expiration year   2037      
Net operating loss carryforwards having indefinite life   $ 132,900,000      
Tax credit carryforwards available to offset future federal tax liabilities   $ 5,000,000.0      
Credit carryforward, expire period   Dec. 31, 2040      
Net operating loss carryforward, derecognized   $ 32,800,000      
State Income Tax          
Income Tax [Line Items]          
Net operating loss carryforwards   $ 8,000,000.0      
Net operating loss carryforwards expiration year   2032      
Tax credit carryforwards available to offset future federal tax liabilities   $ 6,800,000      
CALIFORNIA          
Income Tax [Line Items]          
Net operating loss carryforwards   70,800,000      
Net operating loss carryforward, derecognized   $ 0      
Maximum amount of tax offset per year $ 5,000,000        
Required Minimum Taxable Income $ 1,000,000