Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Cash flows from operating activities:
Net loss	$ (4,268)	$ (1,275)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,577	5,207
Non-cash lease expense	666	0
Stock based compensation	1,864	1,984
Change in fair value of contingent consideration	(657)	(448)
Gain on contingent consideration for IPR&D Write-off	(620)	(175)
Change in accounts receivable allowances	460	(453)
Fixed and intangible asset impairments and disposals	90	99
Write-off of other assets	0	593
Other	(432)	(8)
Changes in operating assets and liabilities:
Accounts receivable	(2,706)	11,474
Inventories	7,247	(5,153)
Prepaid expenses and other	(3,559)	(746)
Accounts payable, accrued and other liabilities	(10,087)	(17,633)
Net cash used in operating activities	(5,425)	(6,534)
Cash flows from investing activities:
Additions to property, plant and equipment	(1,824)	(1,391)
Acquisition of intangibles	0	(150)
Net cash used in investing activities	(1,824)	(1,541)
Cash flows from financing activities:
Repayment of long-term debt	0	(132,500)
Deferred financing costs on long-term debt	0	741
Payment of acquisition related contingent consideration	0	(1,208)
Proceeds (outlays) from exercise of stock options and employee stock purchase plan	491	(1,300)
Net cash provided by (used in) financing activities	491	(135,749)
Effect of exchange rate changes on cash and cash equivalents	252	(168)
Decrease in cash and cash equivalents	(6,506)	(143,992)
Cash and cash equivalents at beginning of period	54,435	227,641
Cash and cash equivalents at end of period	47,929	83,649
Supplemental disclosure of non-cash investing and financing activities:
Accrual for capital expenditures incurred during the period	$ 197	$ 477