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Business Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2015
Apr. 21, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Apr. 29, 2014
Business Acquisition [Line Items]              
Difference between fair value and carrying value as a gain     $ 3,443 $ 0 $ 3,443 $ 0  
Avantec [Member]              
Business Acquisition [Line Items]              
Percentage of ownership under the equity method             15.00%
Business acquisition, amount withheld for idemnification $ 1,800            
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