Commitments and Contingencies (Information About Existing Operating Leases) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Commitments and Contingencies [Abstract]
Operating lease cost	$ 87	$ 87	$ 174
Cash paid for operating leases	84	82	164
Right-of-use assets obtained in exchange for operating lease liabilities	$ 53	$ 680	$ 680
Weighted average remaining lease term (in years)	3 years 18 days	4 years 4 months 21 days	3 years 11 months 16 days
Weighted-average discount rate	4.60%	4.77%	4.77%