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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenues $ 24,181 $ 20,867 $ 47,267 $ 49,583
Cost and operating expenses:        
Cost of revenues 22,611 20,384 40,598 37,310
Research and development 3,083 3,621 6,110 7,532
Selling, general and administrative 8,682 11,736 19,508 25,535
Restructuring and impairments 751 16 764 143
Amortization of acquisition related intangibles 82 80 164 161
Total cost and operating expenses 35,209 35,837 67,144 70,681
Operating loss (11,028) (14,970) (19,877) (21,098)
Change in fair value of derivatives and warrants 886 3,285 1,355 897
Interest expense, net (3,505) (2,919) (5,617) (5,637)
Other expense, net (635) (1,266) (566) (1,143)
Loss before income tax (benefit) expense (14,282) (15,870) (24,705) (26,981)
Income tax (benefit) expense 341 79 430 (757)
Net loss $ (14,623) $ (15,949) $ (25,135) $ (26,224)
Net loss per common share        
Basic $ (0.24) $ (0.31) $ (0.42) $ (0.51)
Diluted $ (0.24) $ (0.31) $ (0.42) $ (0.51)
Weighted average number of common shares outstanding        
Basic 61,116 51,907 59,712 51,551
Diluted 61,116 51,907 59,712 51,551