CONSOLIDATED AND COMBINED FINANCIAL STATEMENT DETAILS - SCHEDULE OF ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued expenses and other current liabilities:
Accrued employee compensation and benefits	$ 30,354	$ 14,379
Accrued advertising expense	17,243	8,209
Other	27,574	11,850
Accrued expenses and other current liabilities	$ 75,171	$ 34,438