Quarterly report pursuant to Section 13 or 15(d)

INVENTORIES - Schedule of Service Parts Inventories (Details)

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INVENTORIES - Schedule of Service Parts Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Service Inventories [Abstract]      
Finished goods $ 13,302 $ 14,863  
Component parts 5,340 7,026  
Total service inventories $ 18,642 $ 21,889 $ 19,915