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Balance Sheet Components - Deferred Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 697,740	$ 618,622
Annual Membership Fees
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 79,100

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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