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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 169,204 $ 137,329
United States    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 120,070 95,774
International    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 49,134 41,555
Neuro    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 80,039 78,076
Vascular    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 89,165 $ 59,253