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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Series A Nonconvertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2013 | $ 427,686 | $ 2 | $ 468 | $ 572,401 | $ (130,159) | $ (4,368) | $ (10,658)
BALANCE (in shares) at Dec. 31, 2013 |  | 200,000 | 46,825,168 |  |  |  | 401,501
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 4,022 |  |  |  | 4,022 |  |
Other comprehensive income (loss) | 122 |  |  |  |  | 122 |
Exercise of common stock options, Shares |  |  | 38,097 |  |  |  |
Exercise of common stock options, Value | 616 |  | 1 | 615 |  |  |
Stock-based employee compensation, net of shares withheld for employee taxes, Shares |  |  | 2,333 |  |  |  |
Stock-based employee compensation, net of shares withheld for employee taxes, Value | (54) |  | 0 | (54) |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board Shares |  |  | 20,734 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board Value | 526 |  | 0 | 526 |  |  |
Issuance of common stock to employees under an Employee Stock Purchase Plan (ESPP) (in shares) |  |  | 3,164 |  |  |  |
Issuance of common stock to employees under an ESPP | 86 |  | 0 | 86 |  |  |
BALANCE at Mar. 31, 2014 | $ 433,004 | $ 2 | $ 469 | $ 573,574 | $ (126,137) | $ (4,246) | $ (10,658)
BALANCE (in shares) at Mar. 31, 2014 |  | 200,000 | 46,889,496 |  |  |  | 401,501

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