Consolidated Statements of Operations - USD ($)	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Income Statement [Abstract]
Net sales	$ 338,752,000	$ 316,219,000	$ 291,010,000
Cost of sales (exclusive of intangible amortization)	164,506,000	150,487,000	134,222,000
Gross profit	174,246,000	165,732,000	156,788,000
Operating expenses
Research and development	29,883,000	30,739,000	36,390,000
Sales and marketing	104,249,000	95,301,000	81,306,000
General and administrative	40,003,000	38,451,000	35,918,000
Amortization of intangibles	18,790,000	19,458,000	18,136,000
Goodwill impairment	14,549,000	0	0
Change in fair value of contingent consideration	2,320,000	1,212,000	89,000
Acquisition, restructuring and other items, net	15,633,000	9,042,000	20,232,000
Total operating expenses	225,427,000	194,203,000	192,071,000
Operating loss	(51,181,000)	(28,471,000)	(35,283,000)
Other expenses
Interest expense, net	(2,702,000)	(688,000)	(861,000)
Other income (expense), net	(554,000)	(790,000)	92,000
Total other expenses, net	(3,256,000)	(1,478,000)	(769,000)
Loss before income tax benefit	(54,437,000)	(29,949,000)	(36,052,000)
Income tax benefit	(1,995,000)	(3,402,000)	(4,504,000)
Net loss	$ (52,442,000)	$ (26,547,000)	$ (31,548,000)
Loss per share
Basic (usd per share)	$ (1.33)	$ (0.68)	$ (0.82)
Diluted (usd per share)	$ (1.33)	$ (0.68)	$ (0.82)
Weighted average shares outstanding
Basic (in shares)	39,480,367	39,009,419	38,342,476
Diluted (in shares)	39,480,367	39,009,419	38,342,476