Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 4)

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Stock-Based Compensation (Details 4) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Additional disclosure          
Stock-based compensation expense $ 481,000 $ 404,000 $ 1,177,000 $ 1,266,000  
Number of preferred stock purchase right for each share of common stock     1    
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001
Purchase price (in dollars per share) $ 10.00   $ 10.00    
Series A Junior Participating Preferred Stock
          
Additional disclosure          
Preferred stock conversion basis     0.01    
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001    
Restricted stock units
          
Stock-Based Compensation          
Weighted average grant date fair value of shares issued (in dollars per share)     $ 1.01    
Shares          
Unvested, balance at the beginning of the period (in shares)     1,143,262    
Granted (in shares)     860,794    
Vested and issued (in shares)     (443,040)    
Forfeited (in shares)     (103,805)    
Unvested, balance at the end of the period (in shares) 1,457,211   1,457,211    
Awards expected to vest (in shares) 1,333,516   1,333,516    
Weighted Average Grant-Date Fair Value          
Unvested restricted stock units outstanding at the beginning of the period (in dollars per share)     $ 1.20    
Granted (in dollars per share)     $ 1.01    
Vested and issued (in dollars per share)     $ 1.15    
Forfeited (in dollars per share)     $ 1.05    
Unvested restricted stock units outstanding at the end of the period (in dollars per share) $ 1.11   $ 1.11    
Awards expected to vest (in dollars per share) $ 1.11   $ 1.11    
Additional disclosure          
Total fair value of units vested and issued 200,000 300,000 500,000 900,000  
Stock-based compensation expense 200,000 200,000 500,000 600,000  
Unrecognized compensation cost $ 1,100,000   $ 1,100,000    
Weighted average period for recognizing compensation cost     2 years 4 months 24 days    
Non-employee director
          
Stock-Based Compensation          
Number of shares issued     74,200 58,540  
Weighted average grant date fair value of shares issued (in dollars per share)     $ 0.98 $ 1.27  
Weighted Average Grant-Date Fair Value          
Granted (in dollars per share)     $ 0.98 $ 1.27