INVENTORY (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of inventory

Inventory consisted of the following (in thousands):

	December 31,
	2017			2016
On-hand final assemblies and finished goods inventories	$	18,374		$	15,346
Deferred cost of goods sold	4,569			4,237
	22,943			19,583
Less current portion	(21,303		)	(18,283		)
Noncurrent portion (included in Other assets)	$	1,640		$	1,300