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Business Combinations - Summary of Purchase Price Allocation to the Fair Values Assigned to the Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Business Acquisition [Line Items]        
Goodwill $ 26,555     $ 8,010
Developed Technology [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 11 years 9 months 18 days      
Creagh Medical Ltd [Member]        
Business Acquisition [Line Items]        
Current assets $ 896      
Property and equipment 634      
Other noncurrent assets 81      
Current liabilities (942)      
Deferred tax liabilities (9)      
Net assets acquired 14,583      
Goodwill 13,440   $ 13,400  
Total purchase price, net of cash acquired $ 28,023      
Creagh Medical Ltd [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 1 year      
Creagh Medical Ltd [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 10 years      
Creagh Medical Ltd [Member] | Developed Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 1,787      
Estimated Useful Life (In years) 7 years      
Creagh Medical Ltd [Member] | In-Process Research and Development [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 942      
Creagh Medical Ltd [Member] | Customer Relationship [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 11,119      
Creagh Medical Ltd [Member] | Customer Relationship [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 7 years      
Creagh Medical Ltd [Member] | Customer Relationship [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 10 years      
Creagh Medical Ltd [Member] | Trade Name [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 75      
NorMedix, Inc. [Member]        
Business Acquisition [Line Items]        
Current assets 113      
Property and equipment 60      
Deferred tax asset 690      
Other noncurrent assets 13      
Accounts payable (187)      
Deferred tax liabilities (2,483)      
Net assets acquired 5,956      
Goodwill 4,452 $ 4,500    
Total purchase price, net of cash acquired 10,408      
NorMedix, Inc. [Member] | Developed Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 6,850      
NorMedix, Inc. [Member] | Developed Technology [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 10 years      
NorMedix, Inc. [Member] | Developed Technology [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life (In years) 14 years      
NorMedix, Inc. [Member] | Customer Relationship [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 900      
Estimated Useful Life (In years) 4 years