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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]    
Revenues $ 23,086 $ 28,716
Cost and operating expenses:    
Cost of revenues 17,987 16,926
Research and development 3,027 3,910
Selling, general and administrative 10,827 13,799
Restructuring and impairments 13 128
Amortization of acquisition related intangibles 82 81
Total cost and operating expenses 31,936 34,844
Operating loss (8,850) (6,128)
Change in fair value of derivatives and warrants 469 (2,388)
Interest expense, net (2,111) (2,718)
Other income, net 69 123
Loss before income tax expense (10,423) (11,111)
Income tax expense (benefit) 90 (836)
Net loss $ (10,513) $ (10,275)
Net loss per common share    
Basic $ (0.18) $ (0.20)
Diluted $ (0.18) $ (0.20)
Weighted average number of common shares outstanding    
Basic 58,300 51,191
Diluted 58,300 51,191