ACQUISITION OF ASTEX THERAPEUTICS LIMITED (Details) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended			9 Months Ended
	Aug. 31, 2012	Feb. 29, 2012	Jul. 31, 2011	Sep. 30, 2012	Jul. 20, 2011
Acquisition of Astex Therapeutics Limited
Installment of deferred consideration paid				$ 12,272,000
Astex Therapeutics Limited (ATL)
Acquisition of Astex Therapeutics Limited
Cash paid on acquisition					24,900,000
Shares issued to the securityholders of acquired entity			32.4
Percent of number of shares issued after giving effect to the acquisition					35.00%
Deferred consideration payable				30,000,000
Incremental borrowing rate to discount expected present value of future semi-annual installments of deferred consideration liability (as a percent)				5.00%
Installment of deferred consideration paid	2,260,000	10,012,000
Astex Therapeutics Limited (ATL) | Maximum
Acquisition of Astex Therapeutics Limited
Deferred consideration payment period				30 months
Payment period of deferred consideration for minimum amount payable				18 months
Astex Therapeutics Limited (ATL) | Minimum
Acquisition of Astex Therapeutics Limited
Amount of deferred consideration payment				$ 15,000,000