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Balance Sheet Accounts (Schedule of Non-Current Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Deferred rent – non-current $ 724 $ 830
Accrued affiliate commissions 1,092 1,322
Income tax payable – non-current 19 1,978
Other non-current liabilities 85 123
Total non-current liabilities [1] $ 1,920 $ 4,253
[1] As adjusted for the adoption of ASC 606 using the full retrospective method