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Business Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 21, 2015
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Apr. 29, 2014
Business Acquisition [Line Items]                
Difference between fair value and carrying value as a gain     $ 0   $ 0 $ 3,443 $ 0  
Avantec [Member]                
Business Acquisition [Line Items]                
Business acquisition, amount withheld for idemnification $ 1,800              
Percentage of minority interest               15.00%
Carrying book value of previous equity interest $ 1,300              
Fair value of equity investment       $ 4,700        
Difference between fair value and carrying value as a gain       3,400        
Mach4 [Member]                
Business Acquisition [Line Items]                
Payment to acquire business, amount in cash after adjustments   $ 17,200            
Amount placed in escrow fund for business acquisition   $ 2,700            
Period after closing date to settle indemnification and other claims   18 months            
Mach4 [Member] | Developed technology [Member] | Income Approach Valuation Technique [Member]                
Business Acquisition [Line Items]                
Discount rate   17.50%            
Royalty rate   5.00%            
Mach4 [Member] | Trade names [Member] | Income Approach Valuation Technique [Member]                
Business Acquisition [Line Items]                
Royalty rate   2.00%            
Mach4 [Member] | Minimum [Member] | Developed technology [Member] | Income Approach Valuation Technique [Member]                
Business Acquisition [Line Items]                
Discount rate   1.50%            
Avantec [Member]                
Business Acquisition [Line Items]                
Period after closing date to settle indemnification and other claims 18 months              
Percentage of interest acquired 85.00%              
Payment to acquire business, in cash $ 12,000              
Business acquisition, potential earn-out payment $ 5,600              
Difference between fair value and carrying value as a gain       $ 3,400        
Avantec [Member] | Trade names [Member] | Income Approach Valuation Technique [Member]                
Business Acquisition [Line Items]                
Royalty rate 1.00%              
Avantec [Member] | Payable After December 31, 2015 [Member]                
Business Acquisition [Line Items]                
Business acquisition, potential earn-out payment $ 3,000              
Avantec [Member] | Payable After December 31, 2016 [Member]                
Business Acquisition [Line Items]                
Business acquisition, potential earn-out payment $ 3,000