QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended														4 Months Ended	12 Months Ended							88 Months Ended
	Nov. 30, 2012		Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2010	May 31, 2010	Feb. 28, 2010	Nov. 30, 2009	Dec. 31, 2012	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2009	Aug. 31, 2008	Aug. 31, 2007	Aug. 31, 2006	Dec. 31, 2012
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) [Abstract]
Net loss	$ (13,400)	[1]	$ (10,200)	$ (3,000)	$ (14,000)	$ (11,400)	$ (3,800)	$ (20,300)	$ (3,000)	$ (10,100)	$ (4,400)	$ (7,400)	$ (4,200)	$ (2,900)	$ (19,292)	$ (38,644)	$ (37,195)	$ (18,928)	$ (9,224)	$ (8,054)	$ (3,632)	$ (969)	$ (135,938)
Net loss per share, basic and diluted (in dollars per share)	$ (0.26)	[1]	$ (0.21)	$ (0.06)	$ (0.29)	$ (0.25)	$ (0.11)	$ (0.62)	$ (0.09)	$ (0.33)	$ (0.17)	$ (0.33)	$ (0.19)	$ (0.16)	$ (0.37)	$ (0.80)	$ (1.15)	$ (0.85)

[1] The Company changed its fiscal year end to December; the four month transition period included one quarterly report on Form 10-Q for the three months ended November 30, 2012.