Certain Balance Sheet Components Summary of the Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounts Receivable, Net, Current [Abstract]
Beginning balance	$ 3,502	$ 3,939	$ 3,320	$ 5,949
Valuation Allowances and Reserves, Adjustments	769	353	1,513	265
Accounts written-off	(310)	(77)	(1,115)	(1,919)
EffectsOfChangeInExchangeRates	30	39	273	(41)
Ending balance	$ 3,991	$ 4,254	$ 3,991	$ 4,254