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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following (in thousands):
 
December 31,
 
2019
 
2018
On-hand final assemblies and finished goods inventories
$
13,283

 
$
19,879

Deferred cost of goods sold
2,441

 
3,798

 
15,724

 
23,677

Less noncurrent portion (included in Other assets)
(924
)
 
(1,075
)
Current portion
$
14,800

 
$
22,602