Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

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

Concentrations. Two licensees individually accounted for 58% and 15% of revenues recognized during the three months ended March 31, 2015, and one licensee accounted for 39% of revenues recognized during the three months ended March 31, 2014. Two licensees individually represented approximately 66% and 17% of accounts receivable at March 31, 2015. Three licensees individually represented approximately 30%, 17% and 15% of accounts receivable at December 31, 2014. For the three months ended March 31, 2015 and 2014, 62% and 16%, 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. 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):

	March 31, 2015
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	53,609	$	3	$	(323	)	$	53,289
Total short-term investments	$	53,609	$	3	$	(323	)	$	53,289

	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