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Convertible Preferred Stock and Stock Warrants (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 14, 2012 | Feb. 04, 2011 | Jan. 06, 2011 | Aug. 12, 2009 | Mar. 31, 2013 payment | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 payment
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
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 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |
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% |  |  |
Number of quarterly dvidend payments |  |  |  |  | 8 |  |  | 8
Criteria for availing obligation to pay dividend for the shareholders |  |  |  |  | Previously paid an amount at least eight quarterly dividends |  |  |
Conversion of preferred stock into common stock, shares |  |  |  |  |  |  |  | 4,871,719
Preferred stock dividends, value of common stock per share |  | $ 91.67 |  |  |  |  |  |
Common Stock Price Per Share |  | $ 6.63 | $ 4.81 |  |  |  |  |
Prior business days for volume-weighted average price per share |  | 10 days | 10 days |  |  |  |  |
Stock Warrants |  |  |  |  |  |  |  |
Change in fair value of warrant liability |  |  |  |  | 0 | (3,875,000) | 2,600,000 |
Revalued warrant liability | $ 14,000,000 |  |  |  |  |  |  |
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 |  |  |  |
Expected term |  |  |  | 5 years |  |  |  |
Volatility rate | 58.10% |  |  | 54.00% |  |  |  |
Risk-free return rate | 0.36% |  |  | 2.70% |  |  |  |
Expected dividend rate | 0.00% |  |  | 0.00% |  |  |  |
Exercisable and Contingent [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Exercise price of the exercisable warrants |  |  |  |  | 1.21 |  |  |

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