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SHAREHOLDERS' EQUITY (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Sep. 30, 2013
Additional Paid-in Capital [Member]
Sep. 30, 2013
Accumulated Deficit [Member]
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Sep. 30, 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     $ 350,235,000   $ 2,000 $ 2,000 $ 465,000 $ 564,883,000 $ (204,211,000) $ (5,702,000) $ (5,202,000)
Net income 5,542,000 (5,468,000) 16,166,000 4,275,000         16,166,000    
Other comprehensive income 115,000 203,000 489,000 461,000           489,000  
Repurchase of common stock (in shares)                     (195,599,000)
Repurchase of common stock     (5,456,000)               (5,456,000)
Exercise of common stock options, net of tendered shares (in shares)             77,589        
Exercise of common stock options, net of tendered shares     890,000       1,000 889,000      
Stock-based employee compensation, net of shares withheld for employee taxes (in shares)             (13,904) [1]        
Stock-based employee compensation, net of shares withheld for employee taxes     1,959,000 [1]       0 [1] 1,959,000 [1]      
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)             34,153 [2]        
Issuance of common stock to Board of Directors and Scientific Advisory Board     898,000 [2]       1,000 [2] 897,000 [2]      
Issuance of common stock under an Employee Stock Purchase Plan (in shares)             11,488        
Issuance of common stock under an Employee Stock Purchase Plan     268,000       0 268,000      
BALANCE (in shares)         200,000 200,000 46,670,763       401,501,000
BALANCE 365,449,000   365,449,000   2,000 2,000 467,000 568,896,000 (188,045,000) (5,213,000) (10,658,000)
Shares issued to employees, earned in prior period     435,000                
Shares issued to employees, earned in prior period (in shares)     13,356                
Shares withheld for employees' tax withholding obligations, earned in prior period     153,000                
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     $ 300,000                
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.