Intellectual Property and Collaborative Agreements (Detail Textuals) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Aug. 31, 2013 Arcturus Subsequent Event	Nov. 30, 2012 Tekmira	Apr. 30, 2013 Tekmira Subsequent Event	Nov. 30, 2012 Mirna	Dec. 31, 2011 Mirna	Dec. 31, 2013 Mirna Subsequent Event Compounds
Intellectual Property And Collaborative Agreements [Line Items]
Payment received under license agreement	$ 0.8
Upfront payment received under license agreement		0.3			63.0	1.0
Additional payment received			0.2
Phase 1 clinical development milestone				0.15
Number of compounds						3
Future additional selection upfront payment						$ 0.5