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Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Inventory Disclosure [Abstract] |  |  |
Raw materials | $ 3,316 | $ 5,049 |
Finished goods | 6,598 | 10,016 |
Reserve for excess, obsolete, and slow moving inventories | (4,196) | (5,596) |
Inventories, net | 5,718 | 9,469 |
Increase in gross inventory levels | (5,200) | 5,000 |
Provision for slow-moving and obsolete inventories | $ (1,400) | $ 3,281 | $ 1,739

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