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, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 21 $ 34 $ 24
Write-offs 0 (11) (11)
Change in provision 40 (2) 21
Balance at end of year $ 61 $ 21 $ 34