RESTRUCTURINGS (Details) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 December 2012 Restructuring item	Dec. 31, 2012 December 2012 Restructuring item	Dec. 03, 2012 December 2012 Restructuring item	Dec. 31, 2012 December 2012 Restructuring One Time Termination Benefits and Impairment of Assets	Dec. 31, 2012 December 2012 Restructuring One-time termination benefits	Dec. 31, 2012 December 2012 Restructuring One-time termination benefits	Dec. 31, 2012 December 2012 Restructuring Employee Severance And Other Benefits	Dec. 31, 2012 December 2012 Restructuring Excess Equipment	Dec. 31, 2012 December 2012 Restructuring Stock-Based Compensation	Dec. 31, 2012 November 2011 Restructuring	Dec. 31, 2011 November 2011 Restructuring item	Dec. 31, 2012 November 2011 Restructuring One-time termination benefits	Dec. 31, 2011 November 2011 Restructuring One-time termination benefits	Dec. 31, 2012 November 2011 Restructuring Employee Severance And Other Benefits	Dec. 31, 2011 November 2011 Restructuring Excess Equipment	Dec. 31, 2011 November 2011 Restructuring Stock-Based Compensation
RESTRUCTURING
Number of positions before restructuring								107
Number of positions after restructuring								64
Number of full-time positions eliminated, inception to date						43	43									66
Number of employees who continued to provide services							10									14
Aggregate potential restructuring charges									$ 2,850,000
Outstanding restructuring liability
Accrual balance at the beginning of the period			3,730,000																3,730,000
Restructuring charges	2,702,000	5,449,000	2,702,000	5,449,000		2,702,000			2,702,000	2,431,000		2,324,000	271,000	107,000		5,449,000		4,575,000		874,000	174,000
Cash payments						(375,000)			(375,000)			(375,000)			(4,142,000)		(3,471,000)	(671,000)	(3,471,000)
Expected cash payments											2,097,000
Adjustments or non-cash credits						(378,000)							(271,000)	(107,000)					(236,000)
Accrual balance at the end of the period	1,972,000	3,730,000	1,972,000	3,730,000		1,949,000	1,949,000					1,949,000							23,000
Expected aggregate cash expenditures									2,472,000
Proceeds on sale of excess equipment			$ 170,000		$ 2,000										$ 170,000