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Segment And Geographic Information (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 78,893 $ 90,891 $ 78,626
Product [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 65,424 77,742 66,355
Instrument [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 34,282 45,126 28,492
Consumable [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 31,142 32,616 37,863
Service and Other [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 13,469 $ 13,149 $ 12,271