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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock based incentive plan, shares | 1,567 | 2,426 | 564
Issuance of shares in common stock offering | 15,000,000 |  |
Offering expenses | $ 2,279 |  |
Preferred Stock [Member] |  |  |
Accrued dividends | 801 |  |
Common Stock [Member] |  |  |
Issuance of shares in common stock offering | 15,000,000 |  |
Offering expenses | 2,279 |  |
Additional Paid-In Capital [Member] |  |  |
Stock based incentive plan, shares | 1,567 | 2,426 | 564
Issuance of shares in common stock offering | 15,000,000 |  |
Offering expenses | 2,279 |  |
Accumulated Deficit [Member] |  |  |
Stock based incentive plan, shares |  |  | 564
Accrued dividends | $ 801 |  |

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