EMPLOYEE STOCK PLANS - Stock Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Number of Shares
Outstanding at December 31, 2011 (in shares)	6,489
Granted (in shares)	3,075	1,600	2,100
Exercised (in shares)	(247)
Canceled or forfeited (in shares)	(1,703)
Outstanding at September 30, 2012 (in shares)	7,614	6,489
Vested and expected to vest at September 30, 2012 (in shares)	7,010
Exercisable at September 30, 2012 (in shares)	3,706
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Outstanding at December 31, 2012 (in usd per share)	$ 4.37
Weighted Average Exercise Price, Granted (in usd per share)	$ 1.67
Weighted Average Exercise Price, Exercised (in usd per share)	$ 0.96
Weighted Average Exercise Price, Canceled or forfeited (in usd per share)	$ 4.61
Weighted-Average Exercise Price, Outstanding at September 30, 2012 (in usd per share)	$ 3.34	$ 4.37
Weighted Average Exercise Price, Vested and expected to vest at September 30, 2012 (in usd per share)	$ 3.47
Weighted Average Exercise Price, Exercisable at September 30, 2012 (in usd per share)	$ 4.96
Weighted Average Remaining Term
Weighted Average Remaining Term, Outstanding at September 30, 2012	4 years 6 months
Weighted Average Remaining Term, Vested and expected to vest at September 30, 2012	4 years 4 months 24 days
Weighted Average Remaining Term, Exercisable at September 30, 2012	2 years 9 months 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding at September 30, 2012	$ 41
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2012	41
Aggregate Intrinsic Value, Exercisable at September 30, 2012	$ 40