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, 2014
Mar. 31, 2013
Mar. 31, 2012
Shares      
Outstanding at the beginning of the period (in shares) 11,800,000 10,000,000  
Outstanding at the end of the period (in shares) 12,900,000 11,800,000 10,000,000
Additional disclosure      
Stock-based compensation expense $ 2,147,000 $ 1,601,000 $ 1,652,000
Stock options
      
Shares      
Outstanding at the beginning of the period (in shares) 11,791,765    
Granted (in shares) 1,665,200    
Exercised (in shares) (345,317)    
Forfeited, cancelled or expired (in shares) (259,960)    
Outstanding at the end of the period (in shares) 12,851,688 11,791,765  
Vested and expected to vest (in shares) 12,665,079    
Options exercisable 9,767,753    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 1.33    
Granted (in dollars per share) $ 0.93    
Exercised (in dollars per share) $ 1.35    
Forfeited, cancelled or expired (in dollars per share) $ 1.85    
Outstanding at the end of the period (in dollars per share) $ 1.27 $ 1.33  
Vested and expected to vest (in dollars per share) $ 1.27    
Exercisable (in dollars per share) $ 1.34    
Weighted Average Remaining Contractual Term (in years)      
Outstanding at the end of the period 5 years 2 months 12 days    
Vested and expected to vest 5 years 2 months 12 days    
Exercisable 4 years 1 month 6 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period 11,838,302    
Vested or expected to vest 11,622,598    
Exercisable 8,478,184    
Additional disclosure      
Stock-based compensation expense 1,100,000 900,000 900,000
Unrecognized compensation cost 1,600,000    
Weighted average period for recognizing compensation cost 2 years 6 months    
Weighted average grant date fair value of options exercised during the period (in dollars per share) $ 1.35   $ 0.99
Total intrinsic value of options exercised during the period 200,000   600,000
Cash received from exercise of stock options $ 500,000   $ 800,000
Weighted-average assumptions used to calculate estimated fair value of each stock option      
Risk-free interest rates (as a percent) 0.90% 0.80% 1.90%
Expected lives (in years) 5 years 8 months 12 days 5 years 8 months 12 days 5 years
Expected volatility (as a percent) 77.30% 79.80% 89.00%
Weighted average grant date fair value of options granted during the period (in dollars per share) $ 0.60 $ 0.67 $ 1.20