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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues $ 14,012 $ 14,876 $ 27,782 $ 27,483
Cost of revenues 10,248 11,252 22,441 19,966
Gross margin 3,764 3,624 5,341 7,517
Operating expenses:        
Research and development 2,398 2,264 4,871 5,103
Selling, general and administrative 5,400 5,175 10,655 10,961
Amortization of acquisition-related intangibles 85 85 170 170
Restructuring 0 93 0 403
(Gain) on Sinovel settlement, net 0 (28,720) 0 (28,720)
Total operating expenses 7,883 (21,103) 15,696 (12,083)
Operating (loss) income (4,119) 24,727 (10,355) 19,600
Change in fair value of warrants 1,145 282 4,092 (182)
Interest income, net 335 232 840 433
Other income, net 1,520 325 976 934
(Loss) income before income tax expense (1,119) 25,566 (4,447) 20,785
Income tax (benefit) expense (294) 3,008 (83) 2,964
Net (loss) income $ (825) $ 22,558 $ (4,364) $ 17,821
Net (loss) income per common share        
Basic (in dollars per share) $ (0.04) $ 1.11 $ (0.21) $ 0.88
Diluted (in dollars per share) $ (0.10) $ 1.10 $ (0.40) $ 0.87
Weighted average number of common shares outstanding        
Basic (in shares) 20,656 20,313 20,586 20,240
Diluted (in shares) 20,723 20,581 20,736 20,560