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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Cash flows from operating activities:    
Net loss $ (15,323) $ (8,536)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 14,276 13,013
Non-cash lease expense 1,209 1,265
Stock based compensation 5,437 4,251
Change in fair value of contingent consideration 804 (473)
Gain on contingent consideration for IPR&D Write-off (2,259) (1,553)
Change in accounts receivable allowances 16 29
Fixed and intangible asset impairments and disposals 97 180
Other (78) (230)
Changes in operating assets and liabilities:    
Accounts receivable (2,922) (2,281)
Inventories 478 10,528
Prepaid expenses and other (4,184) (6,323)
Accounts payable, accrued and other liabilities (4,514) (3,847)
Net cash (used in) provided by operating activities (6,963) 6,023
Cash flows from investing activities:    
Additions to property, plant and equipment (2,152) (3,185)
Additions to placement and evaluation units (7,189) 0
Cash paid for acquisitions (3,600) 0
Net cash used in investing activities (12,941) (3,185)
Cash flows from financing activities:    
Proceeds from borrowings on long-term debt 5,000 0
Proceeds from exercise of stock options and employee stock purchase plan 1,388 481
Net cash provided by financing activities 6,388 481
Effect of exchange rate changes on cash and cash equivalents (354) 271
(Decrease) increase in cash and cash equivalents (13,870) 3,590
Cash and cash equivalents at beginning of period 48,161 54,435
Cash and cash equivalents at end of period 34,291 58,025
Supplemental disclosure of non-cash investing and financing activities:    
Accrual for capital expenditures incurred during the period $ 65 $ 23