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Unaudited Consolidated Statement of Stockholders' Equity (USD $) In Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Other Comprehensive (Income) Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2012 | $ 154,730 | $ 5 | $ (3,701) | $ 195,485 | $ (40) | $ (37,019)
Beginning balance, shares at Dec. 31, 2012 |  | 53,124 | 2,198 |  |  |
Net income | 7,765 |  |  |  |  | 7,765
Foreign currency translation adjustment | (20) |  |  |  | (20) |
Issuance costs of preferred stock and detachable warrants | (200) |  |  | (200) |  |
Stock options exercised | 2,364 |  |  | 2,364 |  |
Stock options exercised, shares |  | 243 |  |  |  |
Stock surrendered for exercise of stock options | 2,357 |  | (2,357) |  |  |
Stock surrendered for exercise of stock options, shares |  |  | 161 |  |  |
Restricted stock granted, shares |  | 278 |  |  |  |
Restricted stock forfeited, shares |  |  | 12 |  |  |
Stock granted in incentive performance plan, shares |  | 217 |  |  |  |
Treasury stock purchased | (2,658) |  | (2,658) |  |  |
Treasury stock purchased, shares |  |  | 180 |  |  |
Excess tax benefit related to share-based awards | 602 |  |  | 602 |  |
Employee stock purchase plan | 150 |  |  | 150 |  |
Employee stock purchase plan, shares |  |  | 11 |  |  |
Stock compensation expense | 2,241 |  |  | 2,241 |  |
Return of borrowed shares under share lending agreement |  |  | 2,440 |  |  |
Ending balance at Mar. 31, 2013 | $ 162,617 | $ 5 | $ (8,716) | $ 200,642 | $ (60) | $ (29,254)
Ending balance, shares at Mar. 31, 2013 |  | 53,862 | 4,980 |  |  |

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