Leases (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Finance Lease, Weighted Average Discount Rate, Percent	5.56%
Finance Lease, Weighted Average Remaining Lease Term	1 year 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	5.25%
Operating Lease, Weighted Average Remaining Lease Term	3 years 3 months 18 days
Future minimum payments, 2019		$ 2,417
Future minimum payments, 2020		2,255
Future minimum payments, 2021		1,689
Future minimum payments, 2022		950
Future minimum payments, 2023		$ 188
ROU asset	$ 4,749
Lease liability	5,086
Non-cash increase of operating lease ROU assets	772
Non-cash increase of lease incentive other assets	150
Non-cash increase of lease liabilities	922
Continuing Operations [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	1,406
Discontinued Operations [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	84
Non-Cash Operating Lease Right Of Use Assets And Liabilities Derecognized	$ 761
Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	3
Illinois [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Singapore [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Indonesia [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
ROU asset	$ 103
Lease liability	$ 72
Germany [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Lease Expiration In 2022 [Member] | Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	2
Lease Expiration In 2023 [Member] | Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | item	1
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years