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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Cash flows from operating activities:    
Net loss $ (12,080) $ (9,720)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 19,392 17,550
Non-cash lease expense 1,860 1,567
Stock based compensation 6,398 5,998
Change in fair value of contingent consideration (290) 116
Gain on contingent consideration for IPR&D Write-off (2,187) (1,606)
Change in accounts receivable allowances 31 186
Fixed and intangible asset impairments and disposals 190 395
Write-off of other assets 0 593
Other (149) 70
Changes in operating assets and liabilities:    
Accounts receivable (1,823) 7,834
Inventories 11,119 (14,036)
Prepaid expenses and other (8,821) (9,378)
Accounts payable, accrued and other liabilities (1,746) (18,003)
Net cash provided by (used in) operating activities 11,894 (18,434)
Cash flows from investing activities:    
Additions to property, plant and equipment (4,567) (5,756)
Acquisition of intangibles 0 (350)
Cash paid for acquisitions 0 (55,760)
Net cash used in investing activities (4,567) (61,866)
Cash flows from financing activities:    
Proceeds from borrowings on long-term debt 0 15,000
Repayment of long-term debt (10,000) (132,500)
Deferred financing costs on long-term debt 0 (775)
Payment of acquisition related contingent consideration 0 (1,208)
Proceeds (outlays) from exercise of stock options and employee stock purchase plan 2,459 (706)
Net cash used in financing activities (7,541) (120,189)
Effect of exchange rate changes on cash and cash equivalents 248 8
Increase (decrease) in cash and cash equivalents 34 (200,481)
Cash and cash equivalents at beginning of period 54,435 227,641
Cash and cash equivalents at end of period 54,469 27,160
Supplemental disclosure of non-cash investing and financing activities:    
Accrual for capital expenditures incurred during the period (113) 214
Fair value of contingent consideration for acquisitions $ 0 $ 14,900