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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]        
Revenues $ 14,134 $ 14,933 $ 41,618 $ 34,904
Cost of revenues 10,398 9,917 30,364 34,103
Gross margin 3,736 5,016 11,254 801
Operating expenses:        
Research and development 2,470 3,023 7,573 8,690
Selling, general and administrative 5,347 5,486 16,308 16,964
Amortization of acquisition-related intangibles 85 85 255 98
Change in fair value of contingent consideration 0 272 0 71
Restructuring 47 1 450 1,328
(Gain) on Sinovel settlement, net (24,978) 0 (53,698) 0
Total operating (income) expenses (17,029) 8,867 (29,112) 27,151
Operating income (loss) 20,765 (3,851) 40,366 (26,350)
Change in fair value of warrants (2,475) 399 (2,658) 1,468
Gain on sale of minority interest 127 0 127 951
Interest income, net 336 49 769 94
Other income (expense), net 124 (279) 1,058 (2,449)
Income (loss) before income tax expense 18,877 (3,682) 39,662 (26,286)
Income tax expense 1,584 566 4,548 496
Net income (loss) $ 17,293 $ (4,248) $ 35,114 $ (26,782)
Net income (loss) per common share        
Basic (in dollars per share) $ 0.85 $ (0.21) $ 1.73 $ (1.44)
Diluted (in dollars per share) $ 0.83 $ (0.21) $ 1.71 $ (1.44)
Weighted average number of common shares outstanding        
Basic (in shares) 20,419 19,949 20,300 18,614
Diluted (in shares) 20,864 19,949 20,538 18,614