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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]    
Revenues $ 28,716 $ 9,058
Cost and operating expenses:    
Cost of revenues 16,926 16,955
Research and development 3,910 8,136
Selling, general and administrative 13,799 21,990
Restructuring and impairments 128  
Amortization of acquisition related intangibles 81 304
Total cost and operating expenses 34,844 47,385
Operating loss (6,128) (38,327)
Change in fair value of derivatives and warrants (2,388)  
Interest (expense) income, net (2,718) 241
Other income, net 123 566
Loss before income tax expense (11,111) (37,520)
Income tax (benefit) expense (836) 159
Net loss $ (10,275) $ (37,679)
Computation of Net (Loss) Income per Common Share [Abstract]    
Basic $ (0.20) $ (0.74)
Net loss per share diluted $ (0.20) $ (0.74)
Weighted average number of common shares outstanding    
Basic 51,191 50,709
Diluted 51,191 50,709