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Stockholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Restricted Stock Units [Member]
Dec. 31, 2011
Restricted Stock Units [Member]
Restricted stock unit activity            
Balance at December 31, 2011, number of Units         1,096  
Granted, Number of Units 0   0   625,148  
Granted, Weighted Average Grant-Date Fair Value   $ 2.01   $ 2.17 $ 5.28  
Vested, Number of Units             
Vested, Weighted Average Grant-Date Fair Value             
Forfeited, Number of Units         (11,500)  
Forfeited, Weighted Average Grant-Date Fair Value         $ 5.29  
Balance at June 30, 2012, Number of Units         614,744  
Balance at December 31, 2011, Weighted Average Grant-Date Fair Value         $ 5.28 $ 4.76
Aggregate Intrinsic Value         $ 3,221,259