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INVENTORY (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
On-hand final assemblies and finished goods inventories | $ 53,433 | $ 13,283
Deferred cost of goods sold | 2,855 | 2,441
Gross inventory | 56,288 | 15,724
Less noncurrent portion (included in other assets) | (5,314) | (924)
Current portion | $ 50,974 | $ 14,800

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