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Stock-Based Compensation (Tables)
 9 Months Ended
Dec. 31, 2011
Stock-Based Compensation [Abstract]  
Summary Of Stock-Based Compensation Expense By Financial Statement Line Item
    Three months ended     Nine months ended
    December 31,     December 31,
    2011   2010     2011   2010
Cost of revenues $ 138 $ (6 ) $ 908 $ 828
Research and development   623   237     1,948   1,396
Selling, general and administrative   1,357   2,017     4,841   7,849
Total $ 2,118 $ 2,248   $ 7,697 $ 10,073
Schedule Of Weighted-Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted
  Three months ended   Nine months ended  
  December 31,   December 31,  
  2011   2010   2011   2010  
Expected volatility 79.7 % 61.4 % 69.7 % 65.5 %
Risk-free interest rate 1.1 % 2.4 % 1.8 % 2.1 %
Expected life (years) 5.9   6.1   5.9   6.1  
Dividend yield None   None   None   None