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Revenue (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Product Information [Line Items]        
Total revenue $ 17,077 $ 24,621 $ 32,675 $ 41,046
Product [Member]        
Product Information [Line Items]        
Total revenue 13,756 21,250 26,049 34,707
Instrument [Member]        
Product Information [Line Items]        
Total revenue 8,934 12,664 12,958 18,287
Consumable [Member]        
Product Information [Line Items]        
Total revenue 4,822 8,586 13,091 16,420
Service and Other [Member]        
Product Information [Line Items]        
Total revenue $ 3,321 $ 3,371 $ 6,626 $ 6,339