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Revenue - Schedule of Deferred Charges Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.