COLLABORATIONS AND ALLIANCES (Detail Textuals) (USD $)	3 Months Ended								12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Daiichi Sankyo Kinase Inhibitor Discovery Agreement	Dec. 31, 2011 Daiichi Sankyo Kinase Inhibitor Discovery Agreement	Dec. 31, 2010 Daiichi Sankyo Kinase Inhibitor Discovery Agreement	Nov. 30, 2008 Daiichi Sankyo Kinase Inhibitor Discovery Agreement Kinases Research collaboration, exclusive license and co-commercialization agreement	Dec. 31, 2010 Daiichi Sankyo Kinase Inhibitor Discovery Agreement Kinases Research collaboration, exclusive license and co-commercialization agreement	May 31, 2009 Daiichi Sankyo Kinase Inhibitor Discovery Agreement Kinases Future milestones and royalties agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received															$ 15,000,000
Potential total of upfront, development and sales milestone payments																	265,000,000
Number of years under agreement, payment for research supported															2 years
Number of additional years extended under agreement, payment for research supported																2 years
Notice period for termination of contract												90 days
Research and development revenue	$ 5,143,000	$ 10,944,000	$ 11,829,000	$ 8,498,000	$ 16,504,000	$ 11,954,000	$ 5,447,000	$ 13,405,000	$ 36,414,000	$ 47,310,000	$ 29,221,000	$ 15,500,000	$ 17,700,000	$ 12,600,000