Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Narrative (Details)

v3.8.0.1
Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 03, 2017
Jul. 06, 2016
Mar. 02, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                    
Revenues       $ 122,643   $ 90,906   $ 369,531 $ 274,193  
Loss from operations       8,540   15,238   3,667 40,378  
Goodwill       182,673     $ 182,673 182,673   $ 113,112
Otometric                    
Business Acquisition [Line Items]                    
Purchase price paid in cash to acquire entity $ 149,200                  
Net working capital adjustment 4,200                  
Revenues             86,200      
Loss from operations             $ (4,600)      
Goodwill $ 58,941                  
Otometric | Pro forma                    
Business Acquisition [Line Items]                    
Pre-tax acquisition-related costs       $ 2,400       $ 6,800    
Pre-tax amortization of intangible assets           2,000     6,000  
Interest expense           $ 1,000     $ 3,000  
RetCam                    
Business Acquisition [Line Items]                    
Purchase price paid in cash to acquire entity   $ 10,600                
Contingent consideration earn-out   2,000                
Additional consideration paid         $ 1,100          
Tangible assets   7,200                
Intangible assets   $ 4,900                
Weighted average life of intangible assets   5 years                
Goodwill   $ 1,700                
Net liabilities   $ 2,000                
NeuroQuest                    
Business Acquisition [Line Items]                    
Purchase price paid in cash to acquire entity     $ 4,600              
Contingent consideration earn-out     500              
Tangible assets     500              
Intangible assets     $ 1,300              
Weighted average life of intangible assets     5 years              
Goodwill     $ 3,500              
Net liabilities     $ 100