Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Concentrations. Three licensees individually accounted for 43%, 30% and 12% of revenues recognized during the three months ended September 30, 2014, and three licensees accounted for 29%, 18% and 11% of revenues recognized during the nine months ended September 30, 2014. Three licensees individually accounted for 34%, 31% and 19% of revenues recognized during the three months ended September 30, 2013, and two licensees individually accounted for 43% and 17% of revenues recognized during the nine months ended September 30, 2013.

Three licensees individually represented approximately 35%, 28% and 14% of accounts receivable at September 30, 2014. Two licensees individually represented approximately 60% and 22% of accounts receivable at December 31, 2013. For the three and nine months ended September 30, 2014, 20% and 49%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions. For the three and nine months ended September 30, 2013, 54% and 26%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions.

Marketable Securities

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	September 30, 2014
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities(1)	$	73,224	$	2	$	(767	)	$	72,459
Total short-term investments	$	73,224	$	2	$	(767	)	$	72,459

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⁽¹⁾ Maturity dates ranging from 2014 to 2015.

	December 31, 2013
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	130,971	$	21	$	(975	)	$	130,017
Total short-term investments	$	130,971	$	21	$	(975	)	$	130,017