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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]      
Revenues $ 96,023 $ 70,530 $ 84,117
Cost of revenues 74,041 67,442 72,858
Gross profit 21,982 3,088 11,259
Operating expenses:      
Research and development 12,303 11,878 12,173
Selling, general and administrative 28,861 29,217 37,230
Arbitration award expense   8,987  
Restructuring and impairments 779 5,366 2,998
Amortization of acquisition related intangibles 157 157 287
Total operating expenses 42,100 55,605 52,688
Operating loss (20,118) (52,517) (41,429)
Change in fair value of derivatives and warrants (228) 3,963 1,872
Loss on extinguishment of debt     (5,197)
Gain on sale of minority interests 3,092    
Interest expense, net (1,037) (1,882) (9,661)
Other (expense) income, net (2,457) 1,596 (991)
Loss before income tax expense (20,748) (48,840) (55,406)
Income tax expense (benefit) 2,391 (184) 852
Net loss $ (23,139) $ (48,656) $ (56,258)
Net loss per common share      
Basic $ (1.76) $ (5.74) $ (8.98)
Diluted $ (1.76) $ (5.74) $ (8.98)
Weighted average number of common shares outstanding      
Basic 13,178 8,477 6,262
Diluted 13,178 8,477 6,262