Quarterly report pursuant to Section 13 or 15(d)

Business Combinations (Details Textual)

v3.7.0.1
Business Combinations (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 04, 2017
Jan. 03, 2017
Jul. 06, 2016
Mar. 02, 2016
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                      
Revenues         $ 122,227   $ 95,958   $ 246,887 $ 183,287  
Loss from operations         (6,277)   13,930   (4,874) 25,142  
Goodwill         176,718     $ 176,718 176,718   $ 113,112
Blackrock Neuromed [Member]                      
Business Acquisition [Line Items]                      
Purchase price paid in cash to acquire entity $ 1,000                    
Contingent consideration earn-out $ 700                    
Otometrics [Member]                      
Business Acquisition [Line Items]                      
Purchase price paid in cash to acquire entity   $ 149,200                  
Net working capital adjustment   4,200                  
Revenues               56,600      
Loss from operations               $ (3,200)      
Goodwill   $ 53,475                  
Otometrics [Member] | Pro forma                      
Business Acquisition [Line Items]                      
Pre-tax acquisition-related costs         $ 2,400       $ 4,400    
Pre-tax amortization of intangible assets             2,000     4,000  
Interest expense             $ 1,000     $ 2,000  
RetCam [Member]                      
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 [Member]                      
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