INVENTORY (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
On-hand final assemblies and finished goods inventories	$ 71,964	$ 13,283
Deferred cost of goods sold	4,167	2,441
Gross inventory	76,131	15,724
Less noncurrent portion (included in other assets)	(9,064)	(924)
Current portion	$ 67,067	$ 14,800