Entity Wide Disclosures - Summary of Revenue by Major Source (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 163,077
Oncology
Disaggregation Of Revenue [Line Items]
Total Revenue	43,853
Metabolic
Disaggregation Of Revenue [Line Items]
Total Revenue	22,055
Cardiology
Disaggregation Of Revenue [Line Items]
Total Revenue	23,736
AVAI
Disaggregation Of Revenue [Line Items]
Total Revenue	16,679
Endocrine
Disaggregation Of Revenue [Line Items]
Total Revenue	6,458
Central Nervous System
Disaggregation Of Revenue [Line Items]
Total Revenue	13,165
Medical Devices
Disaggregation Of Revenue [Line Items]
Total Revenue	2,914
Other
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 34,217