Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ (12,798)	$ 45,884
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	6,785	6,688
Non-cash lease expense	494	476
Stock based compensation	3,205	4,144
Gain on disposal of assets	0	(47,842)
Transaction costs for disposition	0	(2,427)
Change in fair value of contingent consideration	76	(130)
Deferred income taxes	(339)	(11,415)
Change in accounts receivable allowances	270	(78)
Fixed and intangible asset impairments and disposals	20	65
Write-off of other assets	0	869
Other	121	(9)
Changes in operating assets and liabilities:
Accounts receivable	3,784	3,157
Inventories	(4,053)	(4,574)
Prepaid expenses and other	(836)	(4,168)
Accounts payable, accrued and other liabilities	(14,982)	(16,539)
Net cash used in operating activities	(18,253)	(25,899)
Cash flows from investing activities:
Additions to property, plant and equipment	(1,092)	(791)
Additions to placement and evaluation units	(1,313)	(767)
Proceeds from sale of assets	0	100,000
Net cash (used in) provided by investing activities	(2,405)	98,442
Cash flows from financing activities:
Repayment of long-term debt	0	(50,000)
Payment of acquisition related contingent consideration	0	(10,000)
Repurchase of common stock	(552)	0
Proceeds from exercise of stock options and employee stock purchase plan	43	410
Net cash used in financing activities	(509)	(59,590)
Effect of exchange rate changes on cash and cash equivalents	116	13
Increase (decrease) in cash and cash equivalents	(21,051)	12,966
Cash and cash equivalents at beginning of period	76,056	44,620
Cash and cash equivalents at end of period	55,005	57,586
Supplemental disclosure of non-cash investing and financing activities:
Accrual for capital expenditures incurred during the period	$ (32)	$ (68)