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Consolidated Financial Statements Details - Accounts Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Accounts payable — Advertising $ 19,419 $ 27,655
Accounts payable — Other 1,296 1,059
Total $ 20,715 $ 28,714