Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	Jan. 31, 2013	Jun. 30, 2013 Research and development agreements with third parties	Feb. 28, 2013 Bioprocessing services agreement
License Agreements
Amount required to be paid upon achievement of certain milestones		$ 29.0
Amount paid or accrued from inception to date, resulting from the execution of certain agreements, patent approvals, the initiation of sponsor research agreements, and compound development agreements		1.7
Contractual Agreement
Contractual agreement value			2.9
Compensation Arrangements
Bonuses and salary increases paid upon the closing of the IPO	1.0
Bonuses and salary increases payable upon the closing of the IPO	$ 0.4