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INVENTORY - (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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

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