Annual report pursuant to Section 13 and 15(d)

Nature Of Business And Summary Of Significant Accounting Policies Allowance for Doubtful Accounts (Details)

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Nature Of Business And Summary Of Significant Accounting Policies Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 24 $ 55 $ 20
Write-offs (11) 0 (8)
Recoveries 0 0 0
Change in provision 21 (31) 43
Balance at end of year $ 34 $ 24 $ 55