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Revenue Recognition and Trade Receivables, net, Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues by Geographic Market [Abstract]        
Revenues $ 13,267 $ 27,146 $ 50,606 $ 54,723
Minimum [Member]        
Revenues by Geographic Market [Abstract]        
Trade receivables, period for credit term     30 days  
Maximum [Member]        
Revenues by Geographic Market [Abstract]        
Trade receivables, period for credit term     60 days  
United States [Member]        
Revenues by Geographic Market [Abstract]        
Revenues 12,483 26,427 $ 49,060 52,999
Ex-United States [Member]        
Revenues by Geographic Market [Abstract]        
Revenues $ 784 $ 719 $ 1,546 $ 1,724