Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 602	$ 471	$ 471
Charged to costs and expenses	(108)	$ 172	150
Deductions	0		(19)
Balance at end of period	$ 494		$ 602