Commitments and Contingencies Warranty and Extended Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Product Warranty Liability [Line Items]
Deferred Costs, Service Revenue	$ 700	$ 400
Product Warranty Accrual, Current	22
Deferred revenue extended warranties, current	825
Product Warranty Accrual, Noncurrent	0
Deferred revenue extended warranties, noncurrent	646
Warranty [Member]
Product Warranty Liability [Line Items]
Liability, period start	22	0
Product warranty, liabilities assumed from acquisition		0
Standard and Extended Product Warranty Accrual, Decrease for Payments	0	(23)
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued	0	24
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	0	21
Liability, period end	22	22
Deferred revenue [Member]
Product Warranty Liability [Line Items]
Deferred Revenue, period start	1,537	749
Product warranty, liabilities assumed from acquisition		518
Standard and Extended Product Warranty Accrual, Decrease for Payments	(1,417)	(1,296)
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued	1,351	1,566
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	0	0
Deferred Revenue, period end	$ 1,471	$ 1,537