Operating Leases (Narrative) (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) ft² item
Operating Leases [Line Items]
Weighted average remaining term for operating leases	6 years 2 months 26 days
Weighted average discount rate applied to operating leases	5.74%
Cash paid for amounts included in the measurement of operating lease liabilities | $	$ 389,000
Incentives recorded as leasehold improvements | $	$ 783,000
Mixed office and warehouse facility in Golden Valley, Minnesota
Operating Leases [Line Items]
Leased area (in square foot) | ft²	61,208
Lease term	91 months
Number of lease renewal | item	1
Lease renewal term	3 years
Mixed office and warehouse facility in Singapore
Operating Leases [Line Items]
Leased area (in square foot) | ft²	19,805
Number of lease renewal | item	1
Lease renewal term	3 years