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Accounts Receivable (Allowance) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Balance, beginning of period $ 108 $ 274 $ 119 $ 90
Provisions for losses on accounts receivables, net of recoveries 109 (43) 98 141
Accounts receivable written off 9 150 9 150
Balance, end of period $ 208 $ 81 $ 208 $ 81