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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]        
Revenues $ 20,867 $ 20,800 $ 49,583 $ 29,858
Cost and operating expenses:        
Cost of revenues 20,384 21,937 37,310 38,892
Research and development 3,621 7,276 7,532 15,411
Selling, general and administrative 11,736 17,560 25,535 39,550
Restructuring and impairments 16 4,301 143 4,301
Write-off of advance payment   20,551   20,551
Amortization of acquisition related intangibles 80 300 161 604
Total cost and operating expenses 35,837 71,925 70,681 119,309
Operating loss (14,970) (51,125) (21,098) (89,451)
Change in fair value of derivatives and warrants 3,285   897  
Interest (expense) income, net (2,919) 2 (5,637) 243
Other (expense) income, net (1,266) 355 (1,143) 920
Loss before income tax expense (15,870) (50,768) (26,981) (88,288)
Income tax (benefit) expense 79 941 (757) 1,100
Net loss $ (15,949) $ (51,709) $ (26,224) $ (89,388)
Net loss per common share        
Basic $ (0.31) $ (1.02) $ (0.51) $ (1.76)
Diluted $ (0.31) $ (1.02) $ (0.51) $ (1.76)
Weighted average number of common shares outstanding        
Basic 51,907 50,876 51,551 50,716
Diluted 51,907 50,876 51,551 50,716