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Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Preferred Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2009 | $ 27,196 | $ 2 | $ 6,943 | $ (545) | $ 84,020 | $ 118 | $ (63,342)
Beginning balance, shares at Dec. 31, 2009 |  | 24,168,000 | 16,000 | 346,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income (loss) | (43,465) |  |  |  |  |  | (43,465)
Foreign currency translation adjustment | (21) |  |  |  |  | (21) |
Common stock issued in payment of debt issuance costs | 5,096 | 1 |  |  | 5,095 |  |
Common stock issued in payment of debt issuance costs, shares |  | 4,042,000 |  |  |  |  |
Common stock issued in exchange of convertible notes | 1,992 |  |  |  | 1,992 |  |
Common stock issued in exchange of convertible notes, shares |  | 1,569,000 |  |  |  |  |
Accretion of discount on preferred stock |  |  | 5,132 |  |  |  | (5,132)
Preferred stock dividends, net of forfeitures | (1,411) |  |  |  |  |  | (1,411)
Stock warrants exercised | 4,453 | 1 |  |  | 4,452 |  |
Stock warrants exercised, shares |  | 3,923,000 |  |  |  |  |
Fair value of warrant liability reclassified to additional paid-in capital | 0 |  |  |  |  |  |
Stock options exercised | 114 |  |  |  | 114 |  |
Stock options exercised, shares |  | 140,000 |  |  |  |  |
Restricted stock granted, shares |  | 827,000 |  |  |  |  |
Restricted stock forfeited, shares |  |  |  | 23,000 |  |  |
Treasury stock purchased | (347) |  |  | (347) |  |  |
Treasury stock purchased, shares |  |  |  | 196,000 |  |  |
Excess tax benefit related to share-based awards | (1,744) |  |  |  | (1,744) |  |
Stock compensation expense | 4,684 |  |  |  | 4,684 |  |
Conversion of preferred stock into common stock |  |  | (4,795) |  | 4,795 |  |
Conversion of preferred stock into common stock, shares |  | (2,085,000) | (5,000) |  |  |  |
Ending balance at Dec. 31, 2010 | (3,453) | 4 | 7,280 | (892) | 103,408 | 97 | (113,350)
Ending balance, shares at Dec. 31, 2010 |  | 36,754,000 | 11,000 | 565,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income (loss) | 31,408 |  |  |  |  |  | 31,408
Foreign currency translation adjustment | (141) |  |  |  |  | (141) |
Common stock issued in payment of debt issuance costs | 0 |  |  |  |  |  |
Common stock issued in exchange of convertible notes | 0 |  |  |  |  |  |
Sale of common stock, net of issuance cost | 29,438 |  |  |  | 29,438 |  |
Sale of common stock, net of issuance cost, shares | 3,665,000 | 3,665,000 |  |  |  |  |
Common stock issued in payment of term loan debt | 1,398 |  |  |  | 1,398 |  |
Common stock issued in payment of term loan debt, shares | 171,154 | 171,000 |  |  |  |  |
Common stock issued in payment of convertible notes | 5,165 |  |  |  | 5,165 |  |
Common stock issued in payment of convertible notes, shares | 559,007 | 559,000 |  |  |  |  |
Accretion of discount on preferred stock |  |  | 3,925 |  |  |  | (3,925)
Common stock issued in payment of preferred stock dividends | 3,254 |  |  |  | 3,254 |  |
Common stock issued in payment of preferred stock dividends, shares | 624,171 | 624,000 |  |  |  |  |
Preferred stock dividends, net of forfeitures | (943) |  |  |  |  |  | (943)
Stock warrants exercised | 4,793 |  |  |  | 4,793 |  |
Stock warrants exercised, shares | 3,960,747 | 3,961,000 |  |  |  |  |
Fair value of warrant liability reclassified to additional paid-in capital | 0 |  |  |  |  |  |
Stock options exercised | 147 |  |  |  | 147 |  |
Stock options exercised, shares | 64,232 | 64,000 |  |  |  |  |
Restricted stock granted, shares | 1,287,731 | 1,288,000 |  |  |  |  |
Restricted stock forfeited, shares |  |  |  | 11,000 |  |  |
Treasury stock purchased | (775) |  |  | (775) |  |  |
Treasury stock purchased, shares | 57,303 |  |  | 81,000 |  |  |
Excess tax benefit related to share-based awards | 570 |  |  |  | 570 |  |
Stock compensation expense | 7,437 |  |  |  | 7,437 |  |
Conversion of preferred stock into common stock |  | 1 | (11,205) |  | 11,204 |  |
Conversion of preferred stock into common stock, shares | (4,871,719) | (4,872,000) | (11,000) |  |  |  |
Return of borrowed shares under share lending agreement |  |  |  | 701,000 |  |  |
Ending balance at Dec. 31, 2011 | 78,298 | 5 |  | (1,667) | 166,814 | (44) | (86,810)
Ending balance, shares at Dec. 31, 2011 |  | 51,958,000 |  | 1,358,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income (loss) | 49,791 |  |  |  |  |  | 49,791
Other comprehensive income (loss) | 4 |  |  |  |  | 4 |
Common stock issued in payment of debt issuance costs | 0 |  |  |  |  |  |
Sale of common stock, net of issuance cost, shares | 0 |  |  |  |  |  |
Common stock issued in payment of term loan debt, shares | 0 |  |  |  |  |  |
Common stock issued in payment of convertible notes, shares | 0 |  |  |  |  |  |
Common stock issued in payment of preferred stock dividends, shares | 0 |  |  |  |  |  |
Stock warrants exercised | 421 |  |  |  | 421 |  |
Stock warrants exercised, shares | 348,350 | 348,000 |  |  |  |  |
Fair value of warrant liability reclassified to additional paid-in capital | 13,973 |  |  |  | 13,973 |  |
Stock options exercised | 167 |  |  |  | 167 |  |
Stock options exercised, shares | 67,500 | 68,000 |  |  |  |  |
Restricted stock granted, shares | 750,476 | 750,000 |  |  |  |  |
Restricted stock forfeited, shares |  |  |  | 30,000 |  |  |
Treasury stock purchased | (2,034) |  |  | (2,034) |  |  |
Treasury stock purchased, shares | 166,334 |  |  | 166,000 |  |  |
Excess tax benefit related to share-based awards | 528 |  |  |  | 528 |  |
Employee stock purchase plan | 161 |  |  |  | 161 |  |
Employee stock purchase plan, shares |  |  |  | (15,000) |  |  |
Stock compensation expense | 13,421 |  |  |  | 13,421 |  |
Conversion of preferred stock into common stock, shares | 0 |  |  |  |  |  |
Return of borrowed shares under share lending agreement |  |  |  | 659,000 |  |  |
Ending balance at Dec. 31, 2012 | $ 154,730 | $ 5 | $ 0 | $ (3,701) | $ 195,485 | $ (40) | $ (37,019)
Ending balance, shares at Dec. 31, 2012 |  | 53,124,000 | 0 | 2,198,000 |  |  |

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