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
Jun. 30, 2013
Jun. 30, 2012
Additional disclosure    
Stock-based compensation expense $ 734,000 $ 338,000
Stock options
    
Shares    
Outstanding at the beginning of the period (in shares) 11,791,765  
Granted (in shares) 1,585,200 0
Forfeited, cancelled or expired (in shares) (26,083)  
Outstanding at the end of the period (in shares) 13,350,882  
Vested and expected to vest (in shares) 13,011,245  
Options exercisable 9,605,095  
Exercised (in shares) 0 0
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 1.33  
Granted (in dollars per share) $ 0.92  
Forfeited, cancelled or expired (in dollars per share) $ 1.49  
Outstanding at the end of the period (in dollars per share) $ 1.28  
Vested and expected to vest (in dollars per share) $ 1.29  
Exercisable (in dollars per share) $ 1.38  
Weighted Average Remaining Contractual Term (in years)    
Outstanding at the end of the period 5 years 10 months 13 days  
Vested and expected to vest 5 years 9 months 11 days  
Exercisable 4 years 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding at the end of the period 2,055,658  
Vested or expected to vest 1,972,213  
Exercisable 1,250,937  
Additional disclosure    
Stock-based compensation expense 400,000 200,000
Unrecognized compensation cost $ 2,300,000  
Weighted average period for recognizing compensation cost 3 years 1 month 6 days  
Weighted-average assumptions used to calculate estimated fair value of each stock option    
Risk-free interest rates (as a percent) 0.90%  
Expected lives (in years) 5 years 8 months 12 days  
Expected volatility (as a percent) 77.30%  
Weighted average grant date fair value of options granted during the period $ 0.60