Leases (Schedule of Lease Costs and Other Lease Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease
Operating lease cost	$ 410,000	$ 575,000	$ 898,000	$ 1,146,000
Short-term lease cost	23,000	24,000	44,000	63,000
Variable lease cost	37,000	99,000	98,000	216,000
Sublease income
Total Rent and occupancy	470,000	698,000	1,040,000	1,425,000
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	338,000	617,000	894,000	1,231,000
Lease right-of-use assets obtained in exchange for new lease liabilities
Operating leases	$ 487,000	$ 160,000	$ 1,875,000	$ 2,075,000