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Revenue Recognition and Trade Receivables, net, Changes in Allowance for Bad Debts Account (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for doubtful accounts at beginning of period $ 55 $ 108 $ 108
Additions charged to bad debt expense 73   0
Write-downs charged against the allowance (53)   0
Recoveries of amounts previously reserved 0 $ (38) (53)
Allowance for doubtful accounts at end of the period $ 75   $ 55