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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following (in thousands):
 
December 31,
 
2018
 
2017
On-hand final assemblies and finished goods inventories
$
19,879

 
$
18,374

Deferred cost of goods sold
3,798

 
4,569

 
23,677

 
22,943

Less noncurrent portion (included in Other assets)
(1,075
)
 
(1,640
)
Current portion
$
22,602

 
$
21,303