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Summary of Significant Accounting Policies (Details)
 9 Months Ended
Sep. 30, 2013
Royalty Revenue  
Number of days licensees have after the end of the quarter to provide notification of royalty revenue 60 days
Number of days licensees have after the end of the quarter to provide payment of royalty revenue 60 days
Number of days licensees have after the end of the quarter to provide payment of fixed royalty revenue 45 days
Number of types of royalty revenue streams 2