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INVENTORY - (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
On-hand final assemblies and finished goods inventories $ 13,283 $ 19,879
Deferred cost of goods sold 2,441 3,798
Gross inventory 15,724 23,677
Less noncurrent portion (included in Other assets) (924) (1,075)
Current portion $ 14,800 $ 22,602