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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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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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