Commitments and Contingencies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item
Commitments And Contingencies [Line Items]
Loss contingency accrual | $	$ 30
Brea [Member]
Commitments And Contingencies [Line Items]
Lease renewal term	5 years
Number of lease extension options remaining	0
Fresno [Member]
Commitments And Contingencies [Line Items]
Lease expiration year	2020
Number of lease extension options remaining	0