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Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Customer
Dec. 31, 2011
USD ($)
Customer
Dec. 31, 2010
USD ($)
Customer
Dec. 31, 2009
USD ($)
Dec. 31, 2012
Amazon [Member]
Dec. 31, 2011
Amazon [Member]
Dec. 31, 2012
KOBO Inc [Member]
Dec. 31, 2011
KOBO Inc [Member]
Dec. 31, 2012
Sony Corporation [Member]
Dec. 31, 2011
Sony Corporation [Member]
Dec. 31, 2010
Sony Corporation [Member]
Dec. 31, 2011
Barnes and Noble [Member]
Dec. 31, 2010
Sony Ericsson Mobile Communications AB [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2010
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
US [Member]
USD ($)
Dec. 31, 2012
Sweden [Member]
EUR (€)
Summary of Significant Accounting Policies (Textual)                                      
Basic deposit coverage limits per owner and customer                                   $ 250,000 € 100,000
Useful lives                           3 years     5 years    
Entity-Wide Revenue, Major Customer, Percentage         32.00% 40.00% 26.00% 11.00% 17.00% 21.00% 46.00% 26.00% 38.00%            
Percentage of net revenues earned from major customers                           10.00% 10.00% 10.00%      
Days of reporting period stipulated in the contract                           30 days     45 days    
Excess of insurance limits 8,100,000                                    
Impairment of long-lived assets 0                                    
Gains or (losses) resulting from foreign currency transactions (50,000) (44,000) (23,000)                                
Foreign currency translation gain (loss) (8,000) 76,000 33,000                                
Revenue earned, Number of customers 20 7 7                                
Number of technology license contracts with customers 12                                    
Accounts receivable due, Number of customers 15 5                                  
Advertising costs 312,000 241,000 28,000                                
Unrecognized tax benefits                                          
Weighted-average exchange rate for consolidated statements of operations (Swedish Krona to one U.S. Dollar) 6.78 6.50 7.21                                
Exchange rate for the consolidated balance sheets (Swedish Krona to one U.S. Dollar) 6.52 6.92