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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenues $ 18,507 $ 19,004 $ 31,852 $ 42,727
Cost of revenues 16,404 15,992 28,886 36,495
Gross profit 2,103 3,012 2,966 6,232
Operating expenses:        
Research and development 2,867 3,003 5,819 6,165
Selling, general and administrative 6,347 6,773 13,563 14,308
Impairment of minority interest investment 0 38 0 779
Amortization of acquisition related intangibles 39 39 78 78
Total operating expenses 9,253 9,853 19,460 21,330
Operating loss (7,150) (6,841) (16,494) (15,098)
Change in fair value of derivatives and warrants 1,244 701 567 1,501
Interest expense, net (107) (286) (243) (603)
Other expense, net (518) (397) (393) (1,169)
Loss before income tax expense (6,531) (6,823) (16,563) (15,369)
Income tax expense 794 875 1,117 1,450
Net loss $ (7,325) $ (7,698) $ (17,680) $ (16,819)
Net loss per common share        
Basic (in dollars per share) $ (0.53) $ (0.57) $ (1.29) $ (1.31)
Diluted (in dollars per share) $ (0.53) $ (0.57) $ (1.29) $ (1.31)
Weighted average number of common shares outstanding        
Basic (in shares) 13,769 13,595 13,723 12,808
Diluted (in shares) 13,769 13,595 13,723 12,808