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Revenue - Schedule of Deferred Charges Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred charges beginning balance |  | $ 1,374 |  | $ 1,134 |
Additions during the period |  | 1,462 |  | 1,672 |
Recognized as cost of sales |  | (1,398) |  | (1,432) |
Deferred charges ending balance |  | 1,438 |  | 1,374 |
December 31, 2019 [Member] |  |  |  |  |
Recognized as cost of sales |  | 803 |  | 375 | [1]
December 31, 2020 [Member] |  |  |  |  |
Recognized as cost of sales |  | 428 | [1] |  |
December 31, 2021 and Thereafter [Member] |  |  |  |  |
Recognized as cost of sales | [1] | $ 207 |  |  |
December 31, 2018 [Member] |  |  |  |  |
Recognized as cost of sales |  |  |  | $ 999 |
[1] | Amounts included in Other Assets in the Company's Consolidated Balance Sheets at December 31, 2018.

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