v3.26.1
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Cash flows from operating activities:      
Net loss $ (36,742) $ (33,993) $ (184,349)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 22,955 25,800 27,712
Non-cash lease expense 1,555 1,958 1,931
Non-cash interest expense 290 0 0
Goodwill impairment 0 0 159,476
Stock based compensation 13,960 9,772 10,529
Gain on dispositions 0 0 (54,499)
Transaction costs for disposition 0 0 (5,084)
Change in fair value of contingent consideration 0 272 432
Deferred income tax provision 143 (988) (7,968)
Changes in accounts receivable allowances 313 699 1,326
Asset impairments and disposals 1,304 173 7,108
Write-off of other assets 0 0 869
Other 1,969 291 (62)
Changes in operating assets and liabilities:      
Accounts receivable (5,750) 23 7,894
Inventories 10,047 (1,347) (9,410)
Prepaid expenses and other (1,122) 3,089 (11,594)
Accounts payable, accrued and other liabilities (5,833) (15,877) 27,531
Net cash provided by (used in) operating activities 3,089 (10,128) (28,158)
Cash flows from investing activities:      
Additions to property, plant and equipment (2,581) (4,464) (2,518)
Additions to placement and evaluation units (3,368) (5,714) (5,015)
Proceeds from sale of assets 0 0 134,500
Acquisition of intangibles 0 0 (3,250)
Net cash (used in) provided by investing activities (5,949) (10,178) 123,717
Cash flows from financing activities:      
Repayment of long-term debt 0 0 (50,000)
Deferred financing costs on long-term debt 0 (680) 0
Principal payments on financing arrangement (375) (148) 0
Proceeds from financing arrangement 0 6,310 0
Payment of acquisition related contingent consideration 0 (5,000) (15,000)
Repurchase of common stock 0 (1,670) 0
Proceeds from exercise of stock options and employee stock purchase plan 939 933 752
Net cash provided by (used in) financing activities 564 (255) (64,248)
Effect of exchange rate changes on cash and cash equivalents 267 398 125
Increase (decrease) in cash and cash equivalents (2,029) (20,163) 31,436
Cash and cash equivalents at beginning of year 55,893 76,056 44,620
Cash and cash equivalents at end of year 53,864 55,893 76,056
Supplemental disclosure of non-cash investing and financing activities:      
Increase (decrease) in accounts payable for purchases of fixed assets (68) (49) (78)
Cash paid during the year for:      
Interest 426 185 0
Income taxes $ 405 $ 800 $ 455