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Commitments and Contingencies (Narrative) (Details) - USD ($)
12 Months Ended 24 Months Ended 60 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2021
Oct. 30, 2021
Oct. 30, 2019
Dec. 29, 2016
Property Subject to or Available for Operating Lease [Line Items]              
Asset pledged as collateral   $ 909,000 $ 909,000        
Leasehold improvements $ 13,700,000            
Lease expense 2,800,000 2,800,000          
Amortization of right of use asset 1,300,000            
Restricted cash 909,000 $ 909,000 $ 909,000        
4550 Towne Centre Court, San Diego, California [Member]              
Property Subject to or Available for Operating Lease [Line Items]              
Term of lease agreement             10 years
Term for option to extend lease agreement             5 years
4550 Towne Centre Court, San Diego, California [Member] | Letter of Credit [Member]              
Property Subject to or Available for Operating Lease [Line Items]              
Past term of contract     2 years        
4550 Towne Centre Court, San Diego, California [Member] | Letter of Credit [Member] | Scenario, Forecast [Member]              
Property Subject to or Available for Operating Lease [Line Items]              
Security deposit         $ 303,000 $ 606,000  
Past term of contract       5 years      
Financial Standby Letter of Credit [Member] | 4550 Towne Centre Court, San Diego, California [Member] | Letter of Credit [Member]              
Property Subject to or Available for Operating Lease [Line Items]              
Stand by letter of credit $ 900,000