Commitments and Contingencies (Information About Existing Operating Leases) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Commitments and Contingencies [Abstract]
Operating lease cost	$ 44	$ 43	$ 131	$ 130	$ 174
Cash paid for operating leases	$ 43	$ 41	127	123	164
Right-of-use assets obtained in exchange for operating lease liabilities			$ 53	$ 680	$ 680
Weighted average remaining lease term (in years)	2 years 9 months 15 days	4 years 2 months 1 day	2 years 9 months 15 days	4 years 2 months 1 day	3 years 11 months 16 days
Weighted-average discount rate	4.60%	4.77%	4.60%	4.77%	4.77%