Commitments and Contingencies (Textual 4 - Tradipitant) - Additional Information (Detail) - Tradipitant $ in Millions	12 Months Ended
	Dec. 31, 2012 USD ($)
Tradipitant
Future percentage of royalty payments based net sales	Low double digits
Possible future milestone payments	$ 4.0
Milestone payment under license agreement	1.0
Future Regulatory Approval and Sales Milestones
Tradipitant
Possible future milestone payments	$ 95.0