Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v2.4.0.6
Stock-Based Compensation (Details) (USD $)
12 Months Ended
Mar. 31, 2013
item
Mar. 31, 2012
Mar. 31, 2011
Additional disclosures      
Weighted average grant-date fair value of non-vested shares (in dollars per share) $ 4.09 $ 5.27  
Weighted average grant-date fair value of shares granted (in dollars per share) $ 2.78    
Weighted average grant-date fair value of shares vested (in dollars per share) $ 5.32    
Weighted average grant-date fair value of shares forfeited (in dollars per share) $ 5.69    
Stock options
     
Major components of stock based compensation expense      
Stock-based compensation expense $ 1,640,000 $ 1,330,000 $ 566,000
Stock-based compensation, additional disclosure      
Number of plans with outstanding stock options 4    
Shares authorized for grant 4,000,000    
Expiration period 10 years    
Number of plans that reserved shares of common stock for issuance to executives and key employees 4    
Options      
Outstanding at the beginning of the period (in shares) 1,769,000    
Granted (in shares) 333,000    
Exercised (in shares) (50,000)    
Forfeited (in shares) (16,000)    
Expired (in shares) (85,000)    
Outstanding at the end of the period (in shares) 1,951,000 1,769,000  
Exercisable (in shares) 1,260,000    
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 13.43    
Granted (in dollars per share) $ 4.70    
Exercised (in dollars per share) $ 2.18    
Forfeited (in dollars per share) $ 9.07    
Expired (in dollars per share) $ 23.76    
Outstanding at the end of the period (in dollars per share) $ 11.84 $ 13.43  
Exercisable (in dollars per share) $ 14.61    
Additional disclosures      
Remaining weighted average contractual life of options exercisable 5 years    
Remaining weighted average contractual life of options outstanding 6 years 4 months 24 days    
Total estimated fair value of shares vested 1,700,000 600,000 200,000
Intrinsic value of stock options exercised 200,000 1,000,000 600,000
Stock options | Cost of sales
     
Major components of stock based compensation expense      
Stock-based compensation expense 710,000 542,000 216,000
Stock options | Selling, general and administrative expenses
     
Major components of stock based compensation expense      
Stock-based compensation expense 872,000 788,000 350,000
Stock options | Research and development
     
Major components of stock based compensation expense      
Stock-based compensation expense 58,000    
Stock options | Maximum
     
Stock-based compensation, additional disclosure      
Vesting period 3 years    
Stock options | Minimum
     
Stock-based compensation, additional disclosure      
Vesting period 1 year    
Restricted stock
     
Major components of stock based compensation expense      
Stock-based compensation expense 1,748,000 769,000 329,000
Additional disclosures      
Weighted average grant-date fair value of non-vested shares (in dollars per share) $ 7.15 $ 8.25  
Restricted stock | Cost of sales
     
Major components of stock based compensation expense      
Stock-based compensation expense 445,000 81,000  
Restricted stock | Selling, general and administrative expenses
     
Major components of stock based compensation expense      
Stock-based compensation expense 1,303,000 688,000 329,000
Chief executive officer | Stock options | Awards that vest on June 30, 2014
     
Stock-based compensation, additional disclosure      
Vesting percentage 50.00%    
Chief executive officer | Stock options | Awards that vest on June 30th, 2015
     
Stock-based compensation, additional disclosure      
Vesting percentage 50.00%    
2011 Incentive Plan
     
Stock-based compensation, additional disclosure      
Shares authorized for grant 4,800,000    
Prior Plans | Stock options
     
Stock-based compensation, additional disclosure      
Shares authorized for grant 800,000    
LTIP Plans
     
Major components of stock based compensation expense      
Stock-based compensation expense 1,211,000 976,000 888,000
LTIP Plans | Cost of sales
     
Major components of stock based compensation expense      
Stock-based compensation expense 356,000 176,000  
LTIP Plans | Selling, general and administrative expenses
     
Major components of stock based compensation expense      
Stock-based compensation expense 725,000 800,000 888,000
LTIP Plans | Research and development
     
Major components of stock based compensation expense      
Stock-based compensation expense $ 130,000