Collaboration Agreements (Details) (USD $)	3 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 16, 2014	Feb. 28, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative Arrangement, Milestone Payment	$ 1,000,000	$ 0
SciClone [Member] | Collaborative Arrangement, Co-promotion [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative Agreement, Milestone Payment Received			50,500,000
Co-Pomotion Income	7,800,000
Alnylam Pharmaceuticals, Inc. [Member] | Collaborative Arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Initial payment				25,000,000
Collaborative Arrangement, Milestone Payment				10,000,000
Maximum payment for success-based development and commercialization milestones				$ 170,000,000