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Summary of RSA Activity (Detail) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Number of shares    
Canceled   26,998
Restricted Stock
   
Number of shares    
Unvested number of shares beginning balance 3,113,000  
Granted 365,000 5,065,000
Canceled      
Vested (903,000) (1,992,000)
Unvested number of shares ending balance 2,575,000 3,113,000
Weighted average exercise price    
Unvested weighted average grant date fair value beginning balance $ 1.91  
Granted $ 4.16  
Canceled      
Vested $ 3.35  
Unvested weighted average grant date fair value ending balance $ 1.73 $ 1.91