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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.

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