Leases (Schedule of Lease Costs and Other Lease Information) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Operating lease
Operating lease cost	$ 294,000	$ 624,000
Short-term lease cost	81,000	321,000
Variable lease cost	5,000	50,000
Sublease income
Total lease cost	380,000	995,000
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	275,000	632,000
Lease right-of-use assets obtained in exchange for new lease liabilities
Lease right-of-use assets obtained in exchange for new lease liabilities - operating leases	$ 813,000	$ 3,028,000