Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Finance Lease, Weighted Average Discount Rate, Percent	5.56%
Finance Lease, Weighted Average Remaining Lease Term	1 year 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	5.26%
Operating Lease, Weighted Average Remaining Lease Term	2 years 10 months 24 days
Incremental borrowing rates terms, discount rates	5 years
Operating Lease, Payments | $	$ 507
ROU asset | $	3,862	$ 4,372
Lease liability | $	$ 4,108
Minnesota [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	3
Minnesota [Member] | Lease Expiration In 2022 [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	2
Minnesota [Member] | Lease Expiration In 2023 [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Illinois [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Singapore [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Indonesia [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
ROU asset | $	$ 103
Lease liability | $	$ 72
Germany [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities	1
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	5 years