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6. INVENTORIES (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
May. 31, 2015
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 3,047 $ 4,018
Work-in-process 4,331 2,584
Finished goods 0 521
Inventory $ 7,378 $ 7,123 [1]
[1] The condensed consolidated balance sheet at May 31, 2015 has been derived from the audited consolidated financial statements at that date.