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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 14,876 $ 11,049 $ 27,483 $ 19,971
Cost of revenues 11,252 10,777 19,966 24,186
Gross margin 3,624 272 7,517 (4,215)
Operating expenses:        
Research and development 2,264 2,951 5,103 5,667
Selling, general and administrative 5,175 5,339 10,961 11,477
Amortization of acquisition-related intangibles 85 0 170 13
Change in fair value of contingent consideration 0 (201) 0 (201)
Restructuring 93 (12) 403 1,328
(Gain) on Sinovel settlement, net (28,720) 0 (28,720) 0
Total operating (income) expenses (21,103) 8,077 (12,083) 18,284
Operating income (loss) 24,727 (7,805) 19,600 (22,499)
Change in fair value of warrants 282 144 (182) 1,069
Gain on sale of minority interest 0 951 0 951
Interest income, net 232 54 433 45
Other income (expense), net 325 (796) 934 (2,170)
Income (loss) before income tax (benefit) expense 25,566 (7,452) 20,785 (22,604)
Income tax expense (benefit) 3,008 (171) 2,964 (71)
Net income (loss) $ 22,558 $ (7,281) $ 17,821 $ (22,533)
Net income (loss) per common share        
Basic (in dollars per share) $ 1.11 $ (0.38) $ 0.88 $ (1.26)
Diluted (in dollars per share) $ 1.10 $ (0.38) $ 0.87 $ (1.26)
Weighted average number of common shares outstanding        
Basic (in shares) 20,313 19,060 20,240 17,925
Diluted (in shares) 20,581 19,060 20,560 17,925