Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components [Abstract]
Accounts receivable	$ 254,881	$ 254,640
Allowance for doubtful accounts	(112)	(204)
Product sales rebate and returns reserve	(7,423)	(1,317)	$ (566)	$ (2,031)
Accounts receivable, net	$ 247,346	$ 253,119