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Inventories
12 Months Ended
May 31, 2018
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
As of May 31, 2018 and 2017, inventories consisted of the following:
 
 
May 31, 2018
 
May 31, 2017
(in thousands)
 
Raw materials
$
18,678

 
$
17,563

Work in process
10,808

 
12,602

Finished goods
19,430

 
24,341

Total
$
48,916

 
$
54,506



The Company periodically reviews its inventory for both obsolescence and loss of value. The Company makes assumptions about the future demand for and market value of the inventory. Based on these assumptions, the Company estimates the amount of obsolete, expiring and slow moving inventory. The total inventory reserve at May 31, 2018 and 2017 was $6.1 million and $7.3 million, respectively. Of the $6.1 million reserve at May 31, 2018, $1.6 million relates to the inventory reserve for Acculis inventory as a result of the recall announced in the fourth quarter of fiscal year 2017 and $0.7 million relates to a specific reserve related to the termination of an agreement with a Japanese distributor in the second quarter of fiscal year 2018. Of the $7.3 million in the prior year, $2.4 million relates to the reserve for Acculis inventory.