Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional information (Details)

v3.22.1
Income Taxes - Additional information (Details) - USD ($)
 12 Months Ended 24 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Income Tax Disclosure [Line Items]      
Operating Loss Carry forwards Not Subject To Expiration $ 49,800,000   $ 49,800,000
Operating Loss Carryforwards, Limitations on Use Percentage 80.00%    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2,400,000 $ 500,000  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%
Unrecognized Tax Benefits $ 0   $ 0
California Franchise Tax Board [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2041    
Operating Loss Carryforwards $ 110,600,000   110,600,000
Domestic Tax Authority [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2037    
Operating Loss Carryforwards $ 209,000,000.0   209,000,000.0
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2041    
Operating Loss Carryforwards $ 7,500,000   7,500,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]      
Income Tax Disclosure [Line Items]      
Tax Credit Carryforward, Amount $ 9,200,000   $ 9,200,000