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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Balance, beginning of period $ 1,792 $ 1,125
Add: provision for doubtful accounts 1,855 1,960
Less: write-offs, net of recoveries and other adjustments (852) (1,293)
Balance, end of period $ 2,795 $ 1,792