Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

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Stock-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Additional disclosure    
Stock-based compensation expense $ 463 $ 687
Stock options    
Shares    
Outstanding at the beginning of the period (in shares) 13,163,363  
Granted (in shares) 584,500  
Forfeited, cancelled or expired (in shares) (1,746,669)  
Outstanding at the end of the period (in shares) 12,001,194  
Vested and expected to vest (in shares) 11,836,554  
Exercised (in shares) 9,830,748  
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 1.28  
Granted (in dollars per share) 0.64  
Forfeited, cancelled or expired (in dollars per share) 1.53  
Outstanding at the end of the period (in dollars per share) 1.21  
Vested and expected to vest (in dollars per share) 1.21  
Exercisable (in dollars per share) $ 1.25  
Weighted Average Remaining Contractual Term (in years)    
Outstanding at the end of the period 4 years 6 months  
Vested and expected to vest 4 years 6 months  
Exercisable 3 years 7 months 6 days  
Additional disclosure    
Stock-based compensation expense $ 139 $ 359
Unrecognized compensation cost $ 1,300  
Weighted average period for recognizing compensation cost 2 years 6 months  
Weighted-average assumptions used to calculate estimated fair value of each stock option    
Risk-free interest rates (as a percent) 1.50% 1.80%
Expected lives (in years) 5 years 8 months 12 days 5 years 8 months 12 days
Expected volatility (as a percent) 59.00% 77.00%
Weighted average grant date fair value of options granted during the period (in dollars per share) $ 0.34 $ 0.94