Balance Sheets Components (Accrued Liabilities and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Balance Sheets Components [Abstract]
Accrued payroll and related benefits	$ 3,421	$ 2,842
Accrued customer rebates	12,452	3,026
Accrual for inventory purchases	1,913	1,353
Accrued expenses	6,763	2,952
ESPP employee contributions	1,719	665
Other	1,673	963
Accrued liabilities and other current liabilities	$ 27,941	$ 11,801