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Balance Sheet Components - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Local Deals and Getaway merchant payable included in accounts payable $ 14,600 $ 14,800
Accrued Liabilities Current [Abstract]    
Accrued advertising expense 1,727 1,828
Accrued compensation expense 3,540 3,288
Reserve for member refunds 539 474
Other accrued expenses 2,396 2,678
Deferred rent 500 431
Total accrued expenses and other $ 8,702 $ 8,699