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Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017
Inventories
Raw materials	$ 18,678	$ 17,563
Work in process	10,808	12,602
Finished goods	19,430	24,341
Total	48,916	54,506
Inventory valuation reserve	6,100	7,300
Japanese inventory distributor
Inventory [Line Items]
Inventory write-off	700
Acculis inventory
Inventory [Line Items]
Inventory write-off	$ 1,600	$ 2,400

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