Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 4)

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Stockholders' Equity (Details 4) (USD $)
 1 Months Ended 12 Months Ended
Aug. 31, 2009
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Aug. 31, 2010
Jun. 30, 2000
Shares            
Nonvested, balance at the beginning of the period (in shares)   1,100,000 1,500,000      
Nonvested, balance at the end of the period (in shares)   1,500,000 1,100,000 1,500,000    
Additional disclosure            
Stock-based compensation expense   $ 1,601,000 1,652,000 2,418,000    
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      
Purchase price (in dollars per share)   $ 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        
Purchase Plan
            
Additional disclosure            
Number of shares of common stock reserved for issuance         1,400,000 900,000
Increase in common stock available under the plan 500,000          
Expiration term from approval of grant 10 years          
Maximum amount that can be contributed by the employee   25,000        
Maximum percentage of regular compensation that can be contributed by the employee   15.00%        
Percentage of the fair market value of common stock on the last day of the purchase right period   95.00%        
Options granted (in shares)   22,478 21,338 25,133    
Number of shares available for future grant   442,490        
Restricted stock units
            
Shares            
Nonvested, balance at the beginning of the period (in shares)   1,143,262        
Granted (in shares)   919,414        
Vested and issued (in shares)   (469,911)        
Forfeited (in shares)   (125,669)        
Nonvested, balance at the end of the period (in shares)   1,467,096 1,143,262      
Awards expected to vest (in shares)   1,358,386        
Weighted Average Grant-Date Fair Value            
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share)   $ 1.20        
Granted (in dollars per share)   $ 1.00        
Vested and issued (in dollars per share)   $ 1.15        
Forfeited (in dollars per share)   $ 1.05        
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)   $ 1.10 1.20      
Awards expected to vest (in dollars per share)   $ 1.10        
Additional disclosure            
Vesting period   4 years        
Total fair value of units vested and issued   600,000 1,100,000 800,000    
Stock-based compensation expense   800,000 700,000 1,000,000    
Unrecognized compensation cost   $ 1,000,000        
Weighted average period for recognizing compensation cost   2 years 2 months 12 days        
Weighted average grant date fair value of options granted during the period   $ 1.00 1.47 1.04    
Restricted stock units | Minimum
            
Additional disclosure            
Vesting period   2 years        
Restricted stock units | Maximum
            
Additional disclosure            
Vesting period   4 years        
Restricted stock units | Awards vesting over two years with one-half of units vesting one year after the issuance date
            
Additional disclosure            
Vesting period   1 year        
Awards vesting percentage   50.00%        
Restricted stock units | Awards vesting over two years with other half of units vesting two years after the issuance date
            
Additional disclosure            
Vesting period   2 years        
Restricted stock units | Awards vesting over four years with one-fourth units vesting one year after the issuance date
            
Additional disclosure            
Vesting period   1 year        
Awards vesting percentage   25.00%        
Non-employee director
            
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)   $ 0.98 1.20 0.91    
Additional disclosure            
Number of shares issued   103,574 77,971 109,554