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Other Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Prepaid expenses and other current assets: |  |
Rental and other deposits | $ 3,965 | $ 3,636
Prepayment for investments | 24,953 | 25,574
Advertising prepayment | 5,267 | 3,531
Prepayment to outsourced service providers | 4,043 | 5,422
Amounts deposited by users | 21,203 |
Others | 7,233 | 4,132
Prepaid expenses and other current assets | $ 66,664 | $ 42,295

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