Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Contract Balances [Line Items]
Accounts receivable, net	$ 196,044	$ 183,078
Deferred revenue, current	35,912	45,442
Deferred revenue, non-current	12,932	19,594
Total deferred revenue	48,844	65,036
Prepaid Expenses and Other Current Assets
Schedule Of Contract Balances [Line Items]
Contract assets (included in Prepaid expenses and other current assets)	$ 4,787	$ 753