Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

v2.4.0.8
Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Additional disclosure        
Stock-based compensation expense $ 450,000 $ 358,000 $ 1,184,000 $ 696,000
Stock options
        
Shares        
Outstanding at the beginning of the period (in shares)     11,791,765  
Granted (in shares)     1,665,200  
Forfeited, cancelled or expired (in shares)     (100,848)  
Outstanding at the end of the period (in shares) 13,356,117   13,356,117  
Vested and expected to vest (in shares) 13,074,488   13,074,488  
Options exercisable 9,877,196   9,877,196  
Exercised (in shares) 0 0   0
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 1.33  
Granted (in dollars per share)     $ 0.93  
Forfeited, cancelled or expired (in dollars per share)     $ 1.10  
Outstanding at the end of the period (in dollars per share) $ 1.29   $ 1.29  
Vested and expected to vest (in dollars per share) $ 1.29   $ 1.29  
Exercisable (in dollars per share) $ 1.37   $ 1.37  
Weighted Average Remaining Contractual Term (in years)        
Outstanding at the end of the period     5 years 7 months 13 days  
Vested and expected to vest     5 years 6 months 14 days  
Exercisable     4 years 5 months 8 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period 1,744,683   1,744,683  
Vested or expected to vest 1,686,707   1,686,707  
Exercisable 1,118,477   1,118,477  
Additional disclosure        
Stock-based compensation expense 300,000 200,000 700,000 400,000
Unrecognized compensation cost $ 1,900,000   $ 1,900,000  
Weighted average period for recognizing compensation cost     2 years 10 months 24 days  
Weighted-average assumptions used to calculate estimated fair value of each stock option        
Risk-free interest rates (as a percent) 1.90% 0.80% 0.90% 0.80%
Expected lives (in years) 5 years 8 months 12 days 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% 79.80% 77.30% 79.80%
Weighted average grant date fair value of options granted during the period $ 1.10 $ 1.01 $ 0.93 $ 1.01