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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues $ 27,680 $ 27,908 $ 50,360 $ 53,328
Cost of revenues 25,710 24,647 46,169 46,698
Gross margin 1,970 3,261 4,191 6,630
Operating expenses:        
Research and development 2,314 2,669 4,992 5,711
Selling, general and administrative 7,350 6,697 14,911 13,838
Amortization of acquisition-related intangibles 688 627 1,369 1,212
Change in fair value of contingent consideration (290) (2,430) (120) (2,330)
Total operating expenses 10,062 7,563 21,152 18,431
Operating loss (8,092) (4,302) (16,961) (11,801)
Interest income, net 45 25 70 57
China dissolution (1,921) 0 (1,921) 0
Other income (expense), net 73 24 240 (40)
Loss before income tax expense (9,895) (4,253) (18,572) (11,784)
Income tax expense (benefit) (14) 181 18 (1,947)
Net loss $ (9,881) $ (4,434) $ (18,590) $ (9,837)
Net loss per common share        
Basic (in dollars per share) $ (0.35) $ (0.16) $ (0.67) $ (0.36)
Diluted (in dollars per share) $ (0.35) $ (0.16) $ (0.67) $ (0.36)
Weighted average number of common shares outstanding        
Basic (in shares) 27,867 27,252 27,714 27,040
Diluted (in shares) 27,867 27,252 27,714 27,040