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Business Combinations - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Jan. 08, 2016
USD ($)
Nov. 20, 2015
USD ($)
Nov. 20, 2015
EUR (€)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Nov. 20, 2015
EUR (€)
Business Acquisition [Line Items]                                  
Acquisition transaction, integration and other costs                             $ 3,187    
Business acquisition, revenue recognized       $ 20,058 $ 17,790 $ 17,503 $ 17,761 $ 18,154 $ 19,972 $ 16,699 $ 16,541     $ 73,112 71,366 $ 61,898  
Business acquisition, loss recognized       $ 400 $ 720 $ 506 $ 2,300 $ 2,577 $ 3,934 $ 821 2,653     3,926 $ 9,985 11,947  
Creagh Medical Ltd [Member]                                  
Business Acquisition [Line Items]                                  
Outstanding common shares and voting shares percentage   100.00%           100.00%       100.00% 100.00%   100.00%   100.00%
Payments to acquire business                           28,274      
Upfront payments   $ 19,300 € 18                     18,449      
Contingent milestone payments   12,800                             € 12
Acquisition transaction, integration and other costs                             $ 2,700    
Business acquisition, revenue recognized                         $ 3,300        
Business acquisition, loss recognized                         $ (2,700)        
Creagh Medical Ltd [Member] | Maximum [Member]                                  
Business Acquisition [Line Items]                                  
Payments to acquire business   $ 32,000 € 30                            
NorMedix, Inc. [Member]                                  
Business Acquisition [Line Items]                                  
Outstanding common shares and voting shares percentage 100.00%             100.00%       100.00% 100.00%   100.00%    
Payments to acquire business                           10,425      
Upfront payments $ 7,000                         $ 6,905      
Contingent milestone payments 7,000                                
Acquisition transaction, integration and other costs                             $ 300    
Business acquisition, revenue recognized                       $ 900          
Business acquisition, loss recognized                       $ (400)          
NorMedix, Inc. [Member] | Maximum [Member]                                  
Business Acquisition [Line Items]                                  
Payments to acquire business $ 14,000                                
Creagh Medical and NorMedix [Member]                                  
Business Acquisition [Line Items]                                  
Acquisition transaction, integration and other costs                     $ 2,500            
Creagh Medical and NorMedix [Member] | Unaudited Pro Forma [Member]                                  
Business Acquisition [Line Items]                                  
Amortization expense on intangible assets                             2,800 3,200  
Contingent consideration accretion expense                             1,800 2,100  
Non-recurring professional fees                             3,200    
Tax effect impact                             $ 200 $ 500