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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Income Statement [Abstract]        
Net sales $ 71,182 $ 69,780 $ 214,168 $ 205,825
Cost of sales (exclusive of intangible amortization) 32,652 29,481 99,700 85,765
Gross profit 38,530 40,299 114,468 120,060
Operating expenses:        
Research and development 8,565 8,395 27,286 22,450
Sales and marketing 19,607 20,934 57,486 60,427
General and administrative 9,011 10,203 26,787 29,651
Amortization of intangibles 4,292 5,019 13,838 13,417
Change in fair value of contingent consideration 183 419 (290) 116
Acquisition, restructuring and other items, net 610 1,565 3,057 4,486
Total operating expenses 42,268 46,535 128,164 130,547
Operating loss (3,738) (6,236) (13,696) (10,487)
Other income (expense):        
Interest expense, net (226) (166) (676) (672)
Other income (expense), net (163) (131) 259 (67)
Total other expense, net (389) (297) (417) (739)
Loss before income tax benefit (4,127) (6,533) (14,113) (11,226)
Income tax benefit (583) (824) (2,033) (1,506)
Net loss $ (3,544) $ (5,709) $ (12,080) $ (9,720)
Loss per share, basic (USD per share) $ (0.09) $ (0.15) $ (0.32) $ (0.26)
Loss per share, diluted (USD per share) $ (0.09) $ (0.15) $ (0.32) $ (0.26)
Basic weighted average shares outstanding (in shares) 38,360 37,999 38,281 37,924
Diluted weighted average shares outstanding (in shares) 38,360 37,999 38,281 37,924