Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 9,973	$ 12,925
Research and development tax credit carryforwards	12,500	12,322
Stock-based compensation	4,360	5,256
Depreciation and amortization	7,799
Capitalized research and development	2,521	3,468
Deferred income on shipments to distributors	5,824	7,070
Expected future cost-sharing adjustment	25,257	21,582
Accrued liabilities and other	7,737	6,999
Deferred tax assets	75,971	69,622
Less: Valuation allowance	(4,975)	(6,518)
Deferred tax assets, net	70,996	63,104
Deferred tax liabilities:
Acquired intangible assets	20,656	13,884
Depreciation and amortization	4,604	1,274
Convertible debt	8,080	10,351
Prepaid expenses and other	2,142	1,421
Deferred tax liabilities	35,482	26,930
Net deferred tax assets	$ 35,514	$ 36,174