Leases (Schedule of Lease Costs and Other Lease Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating lease
Operating lease cost	$ 377,000	$ 609,000	$ 1,274,000	$ 1,755,000
Short-term lease cost	24,000	20,000	68,000	83,000
Variable lease cost	40,000	65,000	139,000	281,000
Sublease income
Total Rent and occupancy	441,000	694,000	1,481,000	2,119,000
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	374,000	614,000	1,268,000	1,845,000
Lease right-of-use assets obtained in exchange for new lease liabilities
Operating leases	$ 91,000	$ 278,000	$ 1,966,000	$ 2,353,000