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Accounts Receivable (Allowance) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Balance, beginning of period $ 73 $ 69 $ 115 $ 171
Provisions for losses on accounts receivables, net of recoveries 72 54 30 (40)
Accounts receivable written off, net of recoveries 0 0 0 (8)
Balance, end of period $ 145 $ 123 $ 145 $ 123