Balance Sheet Components - Other Long Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Balance Sheet Components [Abstract]
Long-term contingent consideration	$ 865	[1]	$ 0	[1]
Long-term deferred rent	50		0
Long-term deferred tax liability	10		0
Other long-term liabilities	$ 925		$ 0

[1] Long-term contingent consideration represents the fair value of the potential earn-out payments related to the acquisition of Treehouse based on the terms of the asset purchase agreement.