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Consolidated Balance Sheets (Parenthetical) (USD $)
 6 Months Ended 12 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Preferred stock, shares authorized 15,000,000 15,000,000
Series A preferred stock
    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 20 20
Preferred stock, dividend rate (percentage) 10.00% 10.00%
Preferred stock, shares issued 7 7
Preferred stock, shares outstanding 7 7
Preferred stock, liquidation preference $ 3,582 $ 3,582
Class A common stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 118,759,000 118,759,000
Common stock, shares issued 53,077,216 48,448,137
Common stock, shares outstanding 53,025,776 48,396,697
Treasury stock, Class A shares 51,440 51,440
Class B common stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 1,241,000 1,241,000
Common stock, shares issued 1,241,000 1,241,000
Common stock, shares outstanding 0 0