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Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Prepaid expenses and other current assets $ 11,036   $ 9,949
Capitalized contract acquisition costs, current portion 6,869   0
Total prepaid expenses and other current assets 17,905 $ 15,517 9,949
Other assets 2,487 $ 15,295 1,969
Capitalized contract acquisition costs, net of current portion 15,570   0
Total other assets $ 18,057   $ 1,969