Income Taxes - Income Before Income Taxes, Income Tax Provision and Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income before income taxes
Domestic	$ 4,313	$ 2,249	$ 38,174
Foreign	60,183	28,014	10,866
Income before income taxes	64,496	30,263	49,040
Current:
Domestic	2,639	951	7,083
International	4,421	3,015	882
Total Current	7,060	3,966	7,965
Deferred:
Domestic	(2,430)	(5,825)	2,352
International	(1,628)	2,536	702
Total Deferred	(4,058)	(3,289)	3,054
Provision for income taxes	$ 3,002	$ 677	$ 11,019
Reconciliation of statutory tax rate to effective tax rate
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)	(27.20%)	(30.70%)	(3.50%)
Research and development tax credits (as a percent)	(4.10%)	(5.60%)	(8.60%)
Release of prior year unrecognized tax benefits (as a percent)	(1.70%)	(1.90%)	(2.60%)
Excess officer compensation (as a percent)	1.40%	3.20%	2.30%
Change in cost-sharing treatment of stock-based compensation	(0.50%)	(7.10%)
Change in prior period valuation allowance	(0.60%)	8.80%	(1.40%)
Other (as a percent)	2.40%	0.50%	1.30%
Effective Tax Rate (as a percent)	4.70%	2.20%	22.50%