Commitments and Contingencies Warranty and Extended Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Product Warranty Liability [Line Items]
Deferred Costs, Service Revenue	$ 300	$ 700
Product Warranty Accrual, Current	0
Deferred revenue extended warranties, current	624
Product Warranty Accrual, Noncurrent	0
Deferred revenue extended warranties, noncurrent	485
Warranty [Member]
Product Warranty Liability [Line Items]
Liability, period start	22	22
Standard and Extended Product Warranty Accrual, Decrease for Payments	0	0
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued	0	0
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	(22)	0
Liability, period end	0	22
Deferred revenue [Member]
Product Warranty Liability [Line Items]
Deferred Revenue, period start	1,471	1,537
Standard and Extended Product Warranty Accrual, Decrease for Payments	(1,087)	(1,417)
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued	725	1,351
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	0	0
Deferred Revenue, period end	$ 1,109	$ 1,471