Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2014

Accounting Policies [Abstract]

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

Concentrations. Two licensees individually accounted for 58% and 14% of revenues recognized during the three months ended June 30, 2014, and two licensees accounted for 46% and 11% of revenues recognized during the six months ended June 30, 2014. Three licensees individually accounted for 41%, 20% and 12% of revenues recognized during the three months ended June 30, 2013, and three licensees individually accounted for 50%, 15% and 11% of revenues recognized during the six months ended June 30, 2013. Three license agreements individually accounted for 39%, 19%, and 14% of revenues recognized during the three months ended June 30, 2014, as compared to three license agreements individually accounting for 36%, 18% and 12% of revenues recognized during the three months ended June 30, 2013.

Four licensees individually represented approximately 32%, 27%, 15% and 14% of accounts receivable at June 30, 2014. Two licensees individually represented approximately 60% and 22% of accounts receivable at December 31, 2013. For the three and six months ended June 30, 2014, 79% and 67%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions. For the three and six months ended June 30, 2013, 44% and 22%, 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):

	June 30, 2014
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities(1)	$	75,589	$	6	$	(797	)	$	74,798
Total short-term investments	$	75,589	$	6	$	(797	)	$	74,798

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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