Business Combinations and Contingent Consideration - Summary of Allocation of Total Purchase Price to Net Assets Acquired (Detail) - Captisol-enabled, propylene glycol-free melphalan rights [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]
Total purchase consideration		$ 7,700
In-process research and development [Member]
Business Acquisition, Contingent Consideration [Line Items]
Total purchase consideration	$ 7,700