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Acquisitions (Narrative) (Details) - USD ($)
 3 Months Ended
Jan. 10, 2017
Jul. 25, 2016
Apr. 27, 2016
Mar. 14, 2016
Jan. 07, 2016
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]              
Payments to acquire business, net of cash acquired           $ 19,256,000 $ 8,102,000
Revenues           20,752,000 17,582,000
Loss on disposal of business           0 $ 731,000
Omtool, Ltd [Member]              
Business Acquisition [Line Items]              
Payments to acquire business, net of cash acquired $ 19,300,000            
Cash acquired $ 3,000,000            
Revenue since acquisition date           2,000,000  
Goodwill expected to be tax deductible           0  
Website Analytic Business [Member]              
Business Acquisition [Line Items]              
Payments to acquire business, net of cash acquired         $ 8,000,000    
Cash acquired         400,000    
Cash holdback payable         $ 1,200,000    
Cash holdback payable, payment period (in years)         12 months    
Revenues           4,300,000  
Value of shares issued in acquisition   $ 2,400,000          
Contingent consideration         $ 3,100,000    
Numbers of share issued in acquisition (in shares)   318,302          
Goodwill expected to be tax deductible           4,900,000  
Hipcricket [Member]              
Business Acquisition [Line Items]              
Revenues           5,500,000  
Numbers of share issued in acquisition (in shares)       1,000,000      
Value of equity shares issued       $ 5,700,000      
Goodwill expected to be tax deductible           8,200,000  
Hipcricket [Member] | EPM Live Product Business [Member] | Disposed of by Exchange [Member]              
Business Acquisition [Line Items]              
Fair value of business transferred       5,900,000      
Loss on disposal of business       $ 700,000      
API [Member]              
Business Acquisition [Line Items]              
Payments to acquire business, net of cash acquired     $ 4,100,000        
Cash acquired     100,000        
Cash holdback payable     $ 800,000        
Cash holdback payable, payment period (in years)     12 months        
Revenues           2,500,000  
Goodwill expected to be tax deductible           $ 0