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Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 31,856 | $ 31,856 |
Accumulated Amortization | 25,852 | 23,184 |
Net Carrying Amount | 6,004 | 8,672 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,293 | 2,293 |
Accumulated Amortization | 2,293 | 2,293 |
Net Carrying Amount | 0 | 0 |
User relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 18,678 | 18,678 |
Accumulated Amortization | 12,674 | 10,006 |
Net Carrying Amount | 6,004 | 8,672 |
Developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,356 | 10,356 |
Accumulated Amortization | 10,356 | 10,356 |
Net Carrying Amount | 0 | 0 | $ 2,600
Domain names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 529 | 529 |
Accumulated Amortization | 529 | 529 |
Net Carrying Amount | $ 0 | $ 0 |

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