Income Taxes - Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 21,187	$ 25,869
Research and development tax credit carryforwards	15,068	13,335
Stock-based compensation	7,396	8,757
Capitalized research and development	6,802	8,741
Deferred income on shipments to distributors	9,338	7,413
Expected future cost-sharing adjustment	29,719	25,896
Accrued liabilities and other	11,321	8,619
Deferred tax assets	100,831	98,630
Less: Valuation allowance	(12,361)	(10,264)
Deferred tax assets, net	88,470	88,366
Deferred tax liabilities:
Acquired intangible assets	25,785	33,020
Depreciation and amortization	2,939	2,349
Unremitted foreign earnings for expected future cost-sharing adjustment	31,165	27,495
Prepaid expenses and other	3,069	1,991
Deferred tax liabilities	62,958	64,855
Net deferred tax assets	$ 25,512	$ 23,511