Acquisition of Proteolix (Details 2) (Proteolix, USD $) In Thousands, unless otherwise specified	Nov. 16, 2009 item	Dec. 31, 2012 IPR & D	Dec. 31, 2012 IPR & D Carfilzamib	Dec. 31, 2012 IPR & D Oprozomib	Dec. 31, 2012 IPR & D ONX 0914
Fair values at acquisition date
Number of intangible assets acquired which were valued using the costs incurred to date by Proteolix	2
Estimated Acquisition Date Fair Value		$ 438,800	$ 435,000	$ 3,500	$ 300