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Revenue (Summary of Revenue by Category) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Product Information [Line Items]        
Total revenue $ 30,610 $ 17,077 $ 59,607 $ 32,675
Product [Member]        
Product Information [Line Items]        
Total revenue 26,533 13,756 51,836 26,049
Instrument [Member]        
Product Information [Line Items]        
Total revenue 14,282 8,934 29,221 12,958
Consumable [Member]        
Product Information [Line Items]        
Total revenue 12,251 4,822 22,615 13,091
Service and Other [Member]        
Product Information [Line Items]        
Total revenue $ 4,077 $ 3,321 $ 7,771 $ 6,626