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Commitments and Contingencies Warranty and Extended Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Product Warranty Liability [Line Items]    
Deferred Costs, Service Revenue $ 200 $ 300
Product Warranty Accrual, Current 0  
Deferred revenue extended warranties, current 438  
Product Warranty Accrual, Noncurrent 0  
Deferred revenue extended warranties, noncurrent 301  
Warranty [Member]    
Product Warranty Liability [Line Items]    
Liability, period start 0 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 0 (22)
Liability, period end 0 0
Deferred revenue [Member]    
Product Warranty Liability [Line Items]    
Deferred Revenue, period start 1,109 1,471
Standard and Extended Product Warranty Accrual, Decrease for Payments (817) (1,087)
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued 447 725
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties 0 0
Deferred Revenue, period end $ 739 $ 1,109