Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

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

Concentrations. One licensee individually accounted for 74% of revenues recognized during the three months ended June 30, 2015, and two licensees accounted for 40% and 27% of revenues recognized during the six months ended June 30, 2015. 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.

One licensee individually represented approximately 80% of accounts receivable at June 30, 2015. The majority of accounts receivable balances at June 30, 2015 were collected in July 2015. Three licensees individually represented approximately 30%, 17% and 15% of accounts receivable at December 31, 2014. For the three and six months ended June 30, 2015, 18% and 38%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions, based on the jurisdiction of the entity obligated to satisfy payment obligations pursuant to the applicable revenue arrangement. For the three and six months ended June 30, 2014, 79% and 67%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions. The Company does not have any material foreign operations.

Marketable Securities

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



	June 30, 2015
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	37,270	$	10	$	(190	)	$	37,090
Total short-term investments	$	37,270	$	10	$	(190	)	$	37,090



	December 31, 2014
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	58,819	$	2	$	(263	)	$	58,558
Total short-term investments	$	58,819	$	2	$	(263	)	$	58,558