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Employee Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2014
Employee Benefit Plans  
Summary of activity in the plans with respect to stock options

 

 

 
   Options   Weighted
Average
Exercise
Price Per
Share		   Weighted
Average
Remaining
Contractual
Life		   Aggregate
Intrinsic Value		  
 
   (In thousands)
    
   (Years)
   (In thousands)
  

Options outstanding at March 31, 2013

     1,744   $ 1.74              

Granted

     710     1.85              

Exercised

     (284 )   0.88              

Forfeited

     (54 )   1.50              

Expired

     (98 )   2.43              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Options outstanding at March 31, 2014

     2,018   $ 1.88     6.6   $ 548  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Options exercisable at March 31, 2014

     1,125   $ 1.98     4.6   $ 316  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Vested and expected to vest at March 31, 2014

     1,875   $ 1.88     6.4   $ 518  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Options exercisable at March 31, 2014 pursuant to a change-in-control

     2,018   $ 1.88     6.6   $ 548  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Summary of activity with respect to RSUs

 

 

 
   # of Shares   Weighted
Average
Price Per
Share		   Weighted
Average
Remaining
Life		   Aggregate
Intrinsic Value		  
 
   (In thousands)
    
   (Years)
   (In thousands)
  

RSUs outstanding at March 31, 2013

     210   $ 1.39              

Granted

     90     1.81              

Vested

     (76 )   1.40              

Forfeited

     (29 )   1.09              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

RSUs outstanding at March 31, 2014

     195   $ 1.58     2.3   $ 82  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Expected to vest at March 31, 2014

     169   $ 1.57     2.2   $ 73  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Common stock issuable (for RSUs) at March 31, 2014 upon a change-in-control

     195   $ 1.58     2.3   $ 82  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of stock-based compensation expense

 

 

 
   Year Ended March 31,  
 
   2014   2013   2012  
 
   (In thousands)
  

Cost of revenues

   $ 30   $ 42   $ 45  

Selling, general and administrative expense

     246     237     280  

Research and development expense

     24     —     6  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total stock-based compensation

   $ 300   $ 279   $ 331  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of weighted-average assumptions used in estimating the grant date fair value of stock options granted

 

 

 
   Year Ended March 31,  
 
   2014   2013   2012  

Expected life—years

     7.0     7.0     7.0  

Risk-free interest rate

     2.0 %   1.2 %   1.6 %

Expected volatility of common stock

     51 %   52 %   52 %

Dividend yield

     — %   — %   — %
Summary of certain fair value and intrinsic value information pertaining to stock options

 

 

 
   Year Ended March 31,  
 
   2014   2013   2012  
 
   (In thousands, except per
share amounts)
  

Weighted average grant date fair value per share of options granted

   $ 0.99   $ 0.81   $ 0.61  

Intrinsic value of options exercised

   $ 281   $ 42   $ 7