SHAREHOLDERS' EQUITY (Details) (USD $)	3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Series A Preferred Stock [Member]	Dec. 31, 2011 Series A Preferred Stock [Member]	Mar. 31, 2012 Common Stock [Member]	Mar. 31, 2012 Additional Paid-in Capital [Member]	Mar. 31, 2012 Accumulated Deficit [Member]	Mar. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Shareholders' Equity [Roll Forward]
BALANCE	$ 342,227,000		$ 2,000	$ 2,000	$ 461,000	$ 561,492,000	$ (213,871,000)	$ (5,813,000)	$ (5,857,000)
BALANCE (in shares)			200,000	200,000	46,113,296
Net (loss) income	(1,221,000)	(11,881,000)					(1,221,000)
Other comprehensive (loss) income:
Other comprehensive income	44,000	161,000
Comprehensive income (loss)	(1,177,000)	(11,720,000)
Exercise of common stock options and warrants, net of tendered shares					1,000	540,000
Exercise of common stock options and warrants, net of tendered shares (in shares)					70,115
Stock-based employee compensation, net of shares withheld for employee taxes					1,000	(2,298,000)
Stock-based employee compensation, net of shares withheld for employee taxes (in shares)					122,715
Issuance of common stock to Board of Directors and Scientific Advisory Board						541,000
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)					28,341
Issuance of common stock to employees under an Employee Stock Purchase Plan						71,000
Issuance of common stock to employees under an Employee Stock Purchase Plan (in shares)					2,298
BALANCE	339,906,000		2,000	2,000	463,000	560,346,000	(215,092,000)	(5,813,000)	(5,857,000)
BALANCE (in shares)			200,000	200,000	46,336,765
Shares issued to employees, earned in prior period	376,000
Shares issued to employees, earned in prior period (in shares)	9,376
Shares withheld for employees' tax withholding obligations, earned in prior period	124,000
Shares withheld for employees' tax withholding obligations, earned in prior period (in shares)	3,070
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period	$ 328,000
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period (in shares)	7,490