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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 17,235 | $ 1,152 | $ 158,236 | $ (142,153)
Balance, shares at Dec. 31, 2010 |  | 115,291,000 |  |
Restricted stock issued, net |  | 5 | (5) |
Restricted stock issued net, shares |  | 535,000 |  |
Shares repurchased | (2,153) | (3) | (2,150) |
Shares repurchased, shares |  | (386,000) |  |
Exercise of stock options, net | 538 | 13 | 525 |
Exercise of stock options net, shares | 1,280,687 | 1,243,000 |  |
Stock issued for services, shares |  | 20,000 |  |
Stock issued for services | 127 |  | 127 |
Stock-based compensation | 7,014 |  | 7,014 |
Net income | 3,092 |  |  | 3,092
Balance at Dec. 31, 2011 | 25,853 | 1,167 | 163,747 | (139,061)
Balance, shares at Dec. 31, 2011 |  | 116,703,000 |  |
Net proceeds from sale of common stock | 4,329 | 10 | 4,319 |
Net proceeds from sale of common stock, shares |  | 1,000,000 |  |
Restricted stock issued, net |  | 12 | (12) |
Restricted stock issued net, shares |  | 1,179,000 |  |
Shares repurchased | (2,261) | (4) | (2,257) |
Shares repurchased, shares | (357,123) | (357,000) |  |
Exercise of stock options, net | 4,672 | 80 | 4,592 |
Exercise of stock options net, shares | 8,018,516 | 8,019,000 |  |
Stock issued for services, shares |  | 10,000 |  |
Stock issued for services | 28 |  | 28 |
Stock-based compensation | 7,409 |  | 7,409 |
Net income | 11,030 |  |  | 11,030
Balance at Dec. 31, 2012 | 51,060 | 1,265 | 177,826 | (128,031)
Balance, shares at Dec. 31, 2012 |  | 126,554,000 |  |
Restricted stock issued, net |  | 10 | (10) |
Restricted stock issued net, shares |  | 974,000 |  |
Shares repurchased | (1,613) | (1) | (1,612) |
Shares repurchased, shares | (136,641) | (137,000) |  |
Exercise of stock options, net | 1,586 | 48 | 1,538 |
Exercise of stock options net, shares | 4,875,500 | 4,856,000 |  |
Stock-based compensation | 6,459 |  | 6,459 |
Net income | 51,537 |  |  | 51,537
Balance at Dec. 31, 2013 | $ 109,029 | $ 1,322 | $ 184,201 | $ (76,494)
Balance, shares at Dec. 31, 2013 |  | 132,247,000 |  |

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