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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Income Statement [Abstract]        
Net sales $ 78,280 $ 72,770 $ 155,251 $ 142,986
Cost of sales (exclusive of intangible amortization) 37,725 32,596 74,557 67,048
Gross profit 40,555 40,174 80,694 75,938
Operating expenses:        
Research and development 8,199 9,712 15,593 18,721
Sales and marketing 23,606 20,174 48,052 37,879
General and administrative 9,678 9,219 18,621 17,776
Amortization of intangibles 4,889 4,593 9,710 9,546
Change in fair value of contingent consideration 609 184 804 (473)
Acquisition, restructuring and other items, net 2,253 1,128 4,693 2,447
Total operating expenses 49,234 45,010 97,473 85,896
Operating loss (8,679) (4,836) (16,779) (9,958)
Other income (expense):        
Interest expense, net (174) (235) (330) (450)
Other income (expense), net (10) (102) (362) 422
Total other expense, net (184) (337) (692) (28)
Loss before income tax benefit (8,863) (5,173) (17,471) (9,986)
Income tax benefit (512) (905) (2,148) (1,450)
Net loss $ (8,351) $ (4,268) $ (15,323) $ (8,536)
Loss per share, basic (USD per share) $ (0.21) $ (0.11) $ (0.39) $ (0.22)
Loss per share, diluted (USD per share) $ (0.21) $ (0.11) $ (0.39) $ (0.22)
Basic weighted average shares outstanding (in shares) 39,053 38,327 38,893 38,242
Diluted weighted average shares outstanding (in shares) 39,053 38,327 38,893 38,242