Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 3)

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Stockholders' Equity (Details 3) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Shares      
Outstanding at the beginning of the period (in shares) 10,000,000 10,100,000  
Outstanding at the end of the period (in shares) 11,800,000 10,000,000 10,100,000
Additional disclosure      
Stock-based compensation expense $ 1,601,000 $ 1,652,000 $ 2,418,000
Stock options
      
Shares      
Outstanding at the beginning of the period (in shares) 10,039,651    
Granted (in shares) 1,958,330    
Exercised (in shares) 0    
Forfeited, cancelled or expired (in shares) (206,216)    
Outstanding at the end of the period (in shares) 11,791,765 10,039,651  
Vested and expected to vest (in shares) 11,560,603    
Options exercisable 9,024,229    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 1.41    
Granted (in dollars per share) $ 1.01    
Forfeited, cancelled or expired (in dollars per share) $ 2.16    
Outstanding at the end of the period (in dollars per share) $ 1.33 $ 1.41  
Vested and expected to vest (in dollars per share) $ 1.34    
Exercisable (in dollars per share) $ 1.39    
Weighted Average Remaining Contractual Term (in years)      
Outstanding at the end of the period 5 years 7 months 6 days    
Vested and expected to vest 5 years 6 months    
Exercisable 4 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period 157,050    
Vested or expected to vest 157,048    
Exercisable 155,696    
Additional disclosure      
Weighted average grant date fair value of options exercised during the period (in dollars per share)   $ 0.99 $ 1.05
Stock-based compensation expense 900,000 900,000 1,500,000
Total intrinsic value of option exercises during the period   600,000 35,000
Unrecognized compensation cost $ 1,700,000    
Weighted average period for recognizing compensation cost 2 years 9 months 18 days    
Weighted-average assumptions used to calculate estimated fair value of each stock option      
Risk-free interest rates (as a percent) 0.80% 1.90% 3.10%
Expected lives (in years) 5 years 8 months 12 days 5 years 5 years
Expected volatility (as a percent) 79.80% 89.00% 97.90%
Weighted average grant date fair value of options granted during the period $ 0.67 $ 1.19 $ 1.02