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Description 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, beginning of period $ 15 $ 65 $ 42
Add: bad debt expense 75 171 76
Less: write-offs, net of recoveries (78) (221) (53)
Balance, end of period $ 12 $ 15 $ 65