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Leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ 1.4 $ 1.4      
Right of use asset amortization 0.3   0.6        
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   $ 0.9