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 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Additional disclosure        
Stock-based compensation expense $ 481,000 $ 481,000 $ 1,664,000 $ 1,177,000
Stock options
        
Shares        
Outstanding at the beginning of the period (in shares)     11,791,765  
Granted (in shares) 0 0 1,665,200  
Exercised (in shares)   0 (13,022) 0
Forfeited, cancelled or expired (in shares)     (107,830)  
Outstanding at the end of the period (in shares) 13,336,113   13,336,113  
Vested and expected to vest (in shares) 13,103,969   13,103,969  
Options exercisable 10,059,889   10,059,889  
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)     $ 1.01  
Forfeited, cancelled or expired (in dollars per share)     $ 1.15  
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) $ 1.36   $ 1.36  
Weighted Average Remaining Contractual Term (in years)        
Outstanding at the end of the period     5 years 4 months 13 days  
Vested and expected to vest     5 years 3 months 22 days  
Exercisable     4 years 3 months 7 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period 2,695,890   2,695,890  
Vested or expected to vest 2,620,410   2,620,410  
Exercisable 1,737,651   1,737,651  
Additional disclosure        
Stock-based compensation expense 200,000 300,000 900,000 700,000
Unrecognized compensation cost 1,900,000   1,900,000  
Weighted average period for recognizing compensation cost     2 years 8 months 12 days  
Weighted average grant date fair value of options exercised during the period (in dollars per share) $ 1.01   $ 1.01  
Total intrinsic value of options exercised during the period $ 10,000   $ 10,000  
Weighted-average assumptions used to calculate estimated fair value of each stock option        
Risk-free interest rates (as a percent)     0.90% 0.80%
Expected lives (in years)     5 years 8 months 12 days 5 years 8 months 12 days
Expected volatility (as a percent)     77.30% 79.80%
Weighted average grant date fair value of options granted during the period (in dollars per share)     $ 0.93 $ 1.01