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Revenue (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Product Information [Line Items]        
Total revenue $ 19,082 $ 21,915 $ 51,757 $ 62,961
Product [Member]        
Product Information [Line Items]        
Total revenue 15,749 18,484 41,798 53,191
Instrument [Member]        
Product Information [Line Items]        
Total revenue 7,727 11,583 20,685 29,870
Consumable [Member]        
Product Information [Line Items]        
Total revenue 8,022 6,901 21,113 23,321
Service and Other [Member]        
Product Information [Line Items]        
Total revenue $ 3,333 $ 3,431 $ 9,959 $ 9,770