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Summary of Significant Accounting Policies (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Product Information [Line Items]      
Total revenue $ 78,626 $ 93,468 $ 90,714
Product [Member]      
Product Information [Line Items]      
Total revenue 66,355 80,030 64,609
Instrument [Member]      
Product Information [Line Items]      
Total revenue 28,492 38,626 40,956
Consumable [Member]      
Product Information [Line Items]      
Total revenue 37,863 41,404 23,653
Service and Other [Member]      
Product Information [Line Items]      
Total revenue $ 12,271 $ 13,438 13,971
Collaboration [Member]      
Product Information [Line Items]      
Total revenue     $ 12,134