Business Combinations and Contingent Consideration - Acquisition-Date Fair Value of Consideration Transferred (Detail) - Mar. 31, 2013 - Captisol-enabled, propylene glycol-free melphalan rights [Member] - USD ($) $ in Thousands	Total
Business Acquisition [Line Items]
Cash consideration	$ 3,000
Ligand Contingent Consideration	4,700
Total purchase consideration	$ 7,700