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Equity (Details) - Series C convertible perpetual preferred stock
Jun. 21, 2010
$ / shares
shares
Series C Preferred Stock  
Preferred stock, shares issued | shares 21,004
Conversion price (in dollars per share) | $ / shares $ 3.75
Number of common stock into which preferred stock are convertible (in shares) | shares 5,601,000
Liquidation preference (in dollars per share) | $ / shares $ 1,000