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Revenue (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Product Information [Line Items]    
Total revenue $ 15,598 $ 16,425
Product [Member]    
Product Information [Line Items]    
Total revenue 12,293 13,457
Instrument [Member]    
Product Information [Line Items]    
Total revenue 4,024 5,623
Consumable [Member]    
Product Information [Line Items]    
Total revenue 8,269 7,834
Service and Other [Member]    
Product Information [Line Items]    
Total revenue $ 3,305 $ 2,968