Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

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Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Additional disclosure        
Stock-based compensation expense $ 537,000 $ 450,000 $ 1,223,000 $ 1,184,000
Stock options
        
Shares        
Outstanding at the beginning of the period (in shares)     12,851,688  
Granted (in shares) 0   1,085,800  
Exercised (in shares)   0 (312,241) 0
Forfeited, cancelled or expired (in shares)     (272,572)  
Outstanding at the end of the period (in shares) 13,352,675   13,352,675  
Vested and expected to vest (in shares) 13,140,614   13,140,614  
Options exercisable 10,201,263   10,201,263  
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 1.27  
Granted (in dollars per share)     $ 1.43  
Exercised (in dollars per share)     $ 0.95  
Forfeited, cancelled or expired (in dollars per share)     $ 1.83  
Outstanding at the end of the period (in dollars per share) $ 1.28   $ 1.28  
Vested and expected to vest (in dollars per share) $ 1.28   $ 1.28  
Exercisable (in dollars per share) $ 1.31   $ 1.31  
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 1 month 6 days  
Exercisable     4 years 1 month 6 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period 954,088   954,088  
Vested or expected to vest 944,287   944,287  
Exercisable 752,401   752,401  
Additional disclosure        
Weighted average grant date fair value of options granted during the period (in dollars per share)   $ 1.10 $ 0.94 $ 0.93
Total intrinsic value of options exercised during the period 100,000   100,000  
Cash received from exercise of stock options 300,000   300,000  
Stock-based compensation expense 200,000 300,000 600,000 700,000
Unrecognized compensation cost $ 2,100,000   $ 2,100,000  
Weighted average period for recognizing compensation cost     2 years 7 months 6 days  
Weighted-average assumptions used to calculate estimated fair value of each stock option        
Risk-free interest rates (as a percent)   1.90% 1.80% 0.90%
Expected lives (in years)   5 years 8 months 12 days 5 years 8 months 12 days 5 years 8 months 12 days
Expected volatility (as a percent)   76.00% 77.00% 77.30%
Weighted average grant date fair value of options exercised during the period (in dollars per share)   $ 1.10 $ 0.94 $ 0.93