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Convertible Preferred Stock and Stock Warrants (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 14, 2012 | Feb. 04, 2011 | Jan. 06, 2011 | Aug. 12, 2009 | Dec. 31, 2012 | Dec. 31, 2011 payment | Dec. 31, 2010
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercisable Warrants expires |  |  |  |  | Aug. 12, 2014 |  |
Contingent Warrants expires |  |  |  |  | Nov. 09, 2014 |  |
Change in fair value of warrant liability |  |  |  |  | $ (2,649,000) | $ (9,571,000) | $ 21,464,000
Revalued warrant liability | (14,000,000) |  |  |  |  |  |
Convertible Preferred Stock And Stock Warrants (Textual) [Abstract] |  |  |  |  |  |  |
Issuance of cumulative convertible preferred stock and warrants |  |  |  | 16,000 |  |  |
Issue price of cumulative convertible preferred stock and warrants |  |  |  | $ 1,000 |  |  |
Issuance of detachable warrants to acquire common stock |  |  |  | 155 |  |  |
Issuance of detachable Contingent Warrants to acquire common stock |  |  |  | 500 |  |  |
Proceeds from host contract |  |  |  | 68.00% |  |  |
Net proceeds from host contract |  |  |  | 10,800,000 |  |  |
Fair value of the detachable warrants |  |  |  | 5,200,000 |  |  |
Beneficial conversion discount associated with preferred stock |  |  |  | 5,200,000 |  |  |
Conversion period, in months |  |  |  | 36 months |  |  |
Convertible Preferred Stock shares issued upon conversion |  | 434.782 |  |  | 434.782 |  |
Conversion price of convertible preferred stock |  |  |  |  | $ 2.30 |  |
Cumulative convertible preferred stock, liquidation preference |  |  |  |  | $ 1,000 |  |
Dividends accrued, liquidation preference annual payment rate |  |  | 15.00% |  | 15.00% |  |
Preferred stock dividends, value of common stock per share |  | $ 91.67 | $ 208.33 |  |  |  |
Common Stock Price Per Share | $ 9.53 | $ 6.63 | $ 4.81 |  |  | $ 9.96 |
Prior business days for volume-weighted average price per share |  | 10 days | 10 days |  |  |  |
Conversion of preferred stock into common stock, shares |  |  |  |  | 0 | 4,871,719 |
Number of quarterly dividend payments |  |  |  |  |  | 8 |
Criteria for availing obligation to pay dividend for the shareholders |  |  |  |  | Previously paid an amount at least eight quarterly dividends |  |
Stock warrants exercised, shares |  |  |  |  | 348,350 | 3,960,747 |
Cash proceeds from exercise of warrants |  |  |  |  | $ 421,000 | $ 4,793,000 | $ 4,453,000
Number of warrants exercisable |  |  |  |  | 1,544,250 |  |
Exercisable [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price of the exercisable warrants |  |  |  | 2.31 |  |  |
Contingent [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price of the exercisable warrants |  |  |  | 2.45 |  |  |
Volatility rate | 58.10% |  |  | 54.00% |  |  |
Risk-free rate of return | 0.36% |  |  | 2.70% |  |  |
Assumed dividend rate | 0.00% |  |  | 0.00% |  |  |
Convertible Preferred Stock And Stock Warrants (Textual) [Abstract] |  |  |  |  |  |  |
Term of warrants |  |  |  | 5 years |  |  |
Exercisable and Contingent [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price of the exercisable warrants |  |  |  |  | 1.21 |  |

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- Definition Portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents warrants not settable in cash classified as equity. + References No definition available. + Details
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