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Convertible Preferred Stock and Stock Warrants (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 07, 2014 | Jun. 14, 2012 | Mar. 31, 2014 payment | Mar. 31, 2013 | Dec. 31, 2012 | Feb. 04, 2011 | Aug. 12, 2009
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
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% |  |  |  |
Number of quarterly dvidend payments |  |  | 8 |  |  |  |
Stock Warrants |  |  |  |  |  |  |
Change in fair value of warrant liability |  |  |  |  | $ 2,600,000 |  |
Revalued warrant liability |  | 14,000,000 |  |  |  |  |
Stock warrants exercised, shares | 1,277,250 |  |  |  |  |  |
Common stock issued with warrant exercise, exercise price per share | $ 1.21 |  |  |  |  |  |
Proceeds from exercise of stock warrants | $ 1,500,000 |  | $ 1,545,000 | $ 0 |  |  |
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
Stock Warrants |  |  |  |  |  |  |
Volatility rate |  | 58.10% |  |  |  |  |
Risk-free return rate |  | 0.36% |  |  |  |  |
Expected dividend rate |  | 0.00% |  |  |  |  |

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