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Share-Based Compensation (Details 4) (Stock options, USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Valuation assumptions related to options granted      
Exercise Price (in dollars per share)     $ 3.04
Volatility (as a percent)     80.30%
Risk Free Rate (as a percent)     2.35%
Forfeiture Rate (as a percent)     10.00%
Expected Life 6 years 3 months   6 years
Dividend Rate (as a percent) 0.00% 0.00% 0.00%
Unrecognized share-based compensation related to unvested stock options      
Unrecognized share-based compensation $ 2,536,000    
Weighted average period over which expected to be recognized 4 years 1 month 6 days    
Minimum
     
Valuation assumptions related to options granted      
Exercise Price (in dollars per share) $ 5.26 $ 3.58  
Volatility (as a percent) 78.26% 56.18%  
Risk Free Rate (as a percent) 0.85% 0.09%  
Vesting Period 5 years 0 years 1 year
Forfeiture Rate (as a percent) 7.66% 0.00%  
Expected Life   3 months  
Maximum
     
Valuation assumptions related to options granted      
Exercise Price (in dollars per share) $ 7.08 $ 5.40  
Volatility (as a percent) 80.39% 78.61%  
Risk Free Rate (as a percent) 0.93% 2.25%  
Vesting Period 7 years 5 years 3 years
Forfeiture Rate (as a percent) 9.00% 16.88%  
Expected Life   8 years 3 months