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Entity Wide Disclosures - Summary of Revenue by Major Source (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Total revenue $ 204,995 $ 214,104 $ 435,874 $ 414,845
Oncology        
Disaggregation Of Revenue [Line Items]        
Total revenue 65,629 64,661 134,841 120,623
Other        
Disaggregation Of Revenue [Line Items]        
Total revenue 45,196 47,092 95,765 93,961
Metabolic        
Disaggregation Of Revenue [Line Items]        
Total revenue 30,210 32,367 66,285 67,368
AVAI        
Disaggregation Of Revenue [Line Items]        
Total revenue 22,987 22,664 48,134 42,588
Cardiology        
Disaggregation Of Revenue [Line Items]        
Total revenue 21,755 24,409 47,654 47,059
Central Nervous System        
Disaggregation Of Revenue [Line Items]        
Total revenue 19,218 22,911 43,195 43,246
Revenue Net        
Disaggregation Of Revenue [Line Items]        
Total revenue $ 204,995 $ 214,104 $ 435,874 $ 414,845