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Leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Oct. 30, 2022
Oct. 30, 2019
Dec. 29, 2016
Lessee, Lease, Description [Line Items]          
Term of lease contract         10 years
Renewal term of lease contract         5 years
Lease expense $ 0.7 $ 0.7      
Right of use asset amortization 0.3        
Standby Letters of Credit          
Lessee, Lease, Description [Line Items]          
Security deposit         $ 0.9
Forecast | Standby Letters of Credit          
Lessee, Lease, Description [Line Items]          
Security deposit     $ 0.3 $ 0.6  
4550 Towne Centre Court, San Diego, California | Financial Standby Letter of Credit | Letter of Credit          
Lessee, Lease, Description [Line Items]          
Cash collateral as security $ 0.9