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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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