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Acquisition (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Oct. 31, 2012
Apr. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jul. 31, 2012
Apr. 07, 2011
Apr. 30, 2012
Jingle Networks, Inc [Member]
Sep. 30, 2012
Jingle Networks, Inc [Member]
Sep. 30, 2012
Maximum [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Restricted stock [Member]
Apr. 30, 2012
Restricted stock [Member]
Jingle Networks, Inc [Member]
Apr. 07, 2011
Restricted stock [Member]
Jingle Networks, Inc [Member]
Apr. 30, 2011
Class B [Member]
Business Acquisition [Line Items]                              
Business acquisition, restricted shares issued                       923,250 462,247    
Business acquisition, shares issued at acquisition                             1,019,103
Business acquisition share based compensation, vesting period               4 years              
Fair value of shares issued         $ 7,600,000   $ 7,603,000                
Business acquisition, share price         $ 7.46                    
Business acquisition, period of amortization of intangible assets                   36 months 12 months        
Business acquisition share based compensation, amount paid                           3,300,000  
Cash, net of cash acquired             15,800,000                
Acquisition (Textual) [Abstract]                              
Percentage of stock acquired             100.00%                
Future consideration, net of working capital adjustments             17,600,000                
Future consideration payable, cash or share             18,000,000                
Increase in deferred consideration for share payment             5.00%                
Cash paid, net of working capital and other adjustments   16,900,000                          
Cash paid, net of working capital and other adjustments, for 18 Months 17,900,000                            
Fair value of future consideration         34,700,000                    
Business acquisition, discounted rate of company's incremental borrowing         2.00%                    
Business acquisition future obligation of non-cancelable lease and other costs       372,000                      
Acquisition related costs     132,000                        
Business acquisition, estimation of net operating loss carryforwards           7,000,000                  
Business acquisition, adjustment to goodwill       2,400,000                      
Intangible assets from acquisitions, Net           $ 12,000,000     $ 11,966,000            
Weighted average life of intangible assets         2 years 4 months 24 days