STOCK-BASED COMPENSATION (Detail) - Summary of Unvested Share-Based Payment Awards (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Shares underlying awards unvested at December 31, 2011		3,095,801	3,095,801
Shares underlying awards unvested at December 31, 2011 (in Dollars per share)		$ 2.39	$ 2.39
Shares underlying options granted	255,874	1,953,500	2,209,374	540,250
Shares underlying options granted (in Dollars per share)			$ 0.48	$ 1.07
Shares underlying options vested	(198,736)		(198,736)
Shares underlying options vested (in Dollars per share)			$ 0.93
Shares underlying restricted stock units vested			905,338	395,470
Shares underlying options cancelled	(216,505)	(50,005)	(266,510)
Shares underlying options cancelled (in Dollars per share)			$ 0.69
Shares underlying awards unvested at June 30, 2012	3,754,497		3,754,497
Shares underlying awards unvested at June 30, 2012 (in Dollars per share)	$ 1.31		$ 1.31
Restricted Stock Units (RSUs) [Member]
Shares underlying restricted stock units granted	43,246	199,998	243,244	1,200,341
Shares underlying restricted stock units granted (in Dollars per share)			$ 1.77
Shares underlying restricted stock units vested	(22,082)	(883,256)	(905,338)
Shares underlying restricted stock units vested (in Dollars per share)			$ 2.80
Shares underlying restricted stock units cancelled	(116,001)	(307,337)	(423,338)
Shares underlying restricted stock units cancelled (in Dollars per share)			$ 2.56