Commitments and Contingencies (Narrative) (Details) $ in Thousands	Sep. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Commitments And Contingencies [Line Items]
Right-of-use assets	$ 478	$ 536
Lease liabilities	$ 490	$ 545
Brea [Member]
Commitments And Contingencies [Line Items]
Lease renewal term	5 years
Number of lease extension options remaining | item	0
Fresno [Member]
Commitments And Contingencies [Line Items]
Lease renewal term	2 years