Acquisitions - Summary of Allocation of Total Purchase Price to Net Assets Acquired (Detail) (USD $)	Jun. 30, 2013
Business Acquisition [Line Items]
Total purchase price of net assets acquired	$ 7,700,000
IPR&D - Captisol-enabled, propylene glycol-free melphalan rights [Member]
Business Acquisition [Line Items]
Total purchase price of net assets acquired	$ 7,700,000