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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property and Equipment      
Subtotal $ 16,862 $ 15,793  
Less: accumulated depreciation (10,785) (9,043)  
Property and equipment, net 6,077 6,750  
Depreciation expense 2,500 2,300 $ 2,400
Equipment      
Property and Equipment      
Subtotal 8,274 8,051  
Tooling      
Property and Equipment      
Subtotal 3,390 2,545  
Furniture and Fixtures      
Property and Equipment      
Subtotal 2,087 2,104  
Leasehold improvements      
Property and Equipment      
Subtotal 1,493 1,458  
Demonstration equipment      
Property and Equipment      
Subtotal 1,012 632  
Construction in progress      
Property and Equipment      
Subtotal $ 606 $ 1,003