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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Mar. 31, 2013
Common Stock [Member]
Mar. 31, 2013
Additional Paid-in Capital [Member]
Mar. 31, 2013
Accumulated Deficit [Member]
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Mar. 31, 2013
Treasury Stock [Member]
Increase (Decrease) in Shareholders' Equity [Roll Forward]                  
BALANCE (in shares)     200,000 200,000 46,561,437       205,902,000
BALANCE $ 350,235   $ 2 $ 2 $ 465 $ 564,883 $ (204,211) $ (5,702) $ (5,202)
Net loss (4,758) (1,221)         (4,758)    
Other comprehensive income 166 44           166  
Repurchase of common stock (in shares)                 (195,599,000)
Repurchase of common stock (5,456)               (5,456)
Exercise of common stock options, net of tendered shares (in shares)         5,332        
Exercise of common stock options, net of tendered shares 66       0 66      
Stock-based employee compensation, net of shares withheld for employee taxes (in shares)         (7,981) [1]        
Stock-based employee compensation, net of shares withheld for employee taxes (1,187) [1]       0 [1] (1,187) [1]      
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)         24,153 [2]        
Issuance of common stock to Board of Directors and Scientific Advisory Board 525 [2]       1 [2] 524 [2]      
Issuance of common stock under an Employee Stock Purchase Plan (in shares)         4,258        
Issuance of common stock under an Employee Stock Purchase Plan 93       0 93      
BALANCE (in shares)     200,000 200,000 46,587,199       401,501,000
BALANCE 339,684   2 2 466 564,379 (208,969) (5,536) (10,658)
Shares issued to employees, earned in prior period 435                
Shares issued to employees, earned in prior period (in shares) 13,356                
Shares withheld for employees' tax withholding obligations, earned in prior period 153                
Shares withheld for employees' tax withholding obligations, earned in prior period (in shares) 4,672                
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period $ 300                
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period (in shares) 9,212                
[1] Includes $435 (13,356 shares) that was accrued for in a previous period and charged to expense when earned, but issued in 2013, less shares withheld for taxes in the amount of $153 (4,672 shares).
[2] Includes $300 (9,212 shares) that was earned in a previous period and charged to expense when earned, but issued in 2013.