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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Line Items]      
Income tax benefits for the net operating losses $ 0 $ 0  
Valuation allowance $ 90,477,000 72,791,000 $ 53,834,000
Description of tax benefit likely to be realized upon settlement greater than 50%    
Unrecognized tax benefits $ 0    
Interest or penalties accrued $ 0 0  
Income tax examination description In the normal course of business, the Company is subject to examination by federal and state jurisdictions, where applicable. There are currently no pending tax examinations. Tax years from 2018 to the present are open to examination under the statute.    
Federal      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards $ 284,300,000 227,000,000.0  
Net operating loss carryforwards subject to expiration 79,400,000    
Net operating loss carryforwards not subject to expiration 204,900,000    
Federal | Research and Development.      
Income Tax Disclosure [Line Items]      
Tax credit carryforwards $ 4,500,000    
Federal | Minimum [Member]      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards expiration year 2034    
Federal | Maximum      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards expiration year 2037    
State      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards $ 270,700,000 $ 213,600,000  
Net operating loss carryforwards expiration year 2029    
State | Research and Development.      
Income Tax Disclosure [Line Items]      
Tax credit carryforwards $ 2,900,000