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Summary of Significant Accounting Policies (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Product Information [Line Items]        
Total revenue $ 21,578 $ 20,073 $ 40,940 $ 44,988
Product [Member]        
Product Information [Line Items]        
Total revenue 18,485 16,548 34,767 37,842
Instrument [Member]        
Product Information [Line Items]        
Total revenue 8,525 7,119 15,669 19,752
Consumable [Member]        
Product Information [Line Items]        
Total revenue 9,960 9,429 19,098 18,090
Service and Other [Member]        
Product Information [Line Items]        
Total revenue $ 3,093 $ 3,525 $ 6,173 $ 7,146