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 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Additional disclosure          
Stock-based compensation expense $ 450,000 $ 358,000 $ 1,184,000 $ 696,000  
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    
Period following public announcement of beneficial ownership acquired by various persons resulting in rights becoming exercisable     10 days    
Beneficial ownership of common stock (as a percent)     20.00%    
Period following commencement of tender offer or exchange offer that would result in acquisition of beneficial ownership various persons resulting in rights becoming exercisable     10 days    
Series A Junior Participating Preferred Stock
          
Additional disclosure          
Preferred stock conversion basis     0.01    
Restricted stock units
          
Shares          
Unvested, balance at the beginning of the period (in shares)     1,467,096    
Granted (in shares)     1,245,918    
Vested and issued (in shares)     (625,485)    
Forfeited (in shares)     (64,447)    
Unvested, balance at the end of the period (in shares) 2,023,082   2,023,082    
Awards expected to vest (in shares) 1,810,177   1,810,177    
Weighted Average Grant-Date Fair Value          
Unvested restricted stock units outstanding at the beginning of the period (in dollars per share)     $ 1.10    
Granted (in dollars per share)     $ 1.06    
Vested and issued (in dollars per share)     $ 1.06    
Forfeited (in dollars per share)     $ 1.09    
Unvested restricted stock units outstanding at the end of the period (in dollars per share) $ 1.10   $ 1.10    
Awards expected to vest (in dollars per share) $ 1.10   $ 1.10    
Additional disclosure          
Total fair value of units vested and issued 400,000 44,800 700,000 300,000  
Stock-based compensation expense 200,000 200,000 500,000 300,000  
Unrecognized compensation cost $ 1,700,000   $ 1,700,000    
Weighted average period for recognizing compensation cost     2 years 9 months 18 days    
Weighted average grant date fair value of options granted during the period $ 1.13 $ 1.01 $ 1.06 $ 1.01  
Non-employee director
          
Weighted Average Grant-Date Fair Value          
Granted (in dollars per share) $ 1.10 $ 1.01 $ 1.18 $ 1.00  
Additional disclosure          
Number of shares issued 25,904 22,045 48,162 44,207