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Inventories (Schedule of Inventory Reserve) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventory Valuation Reserves [Roll Forward] |  |  |
Balance, beginning of year | $ 368 | $ 50 | $ 50
Charged to costs and expenses | 2,418 | 388 | 0
Deductions | (669) | (70) | 0
Balance, end of the year | $ 2,117 | $ 368 | $ 50

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