Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 7,912	$ 9,973
Research and development tax credit carryforwards	14,755	12,500
Stock-based compensation	2,619	4,360
Depreciation and amortization	7,424	7,799
Capitalized research and development	1,735	2,521
Deferred income on shipments to distributors	4,018	5,824
Expected future cost-sharing adjustment		25,257
Leases	3,446
Accrued liabilities and other	7,374	7,737
Deferred tax assets	49,283	75,971
Less: Valuation allowance	(4,486)	(4,975)
Deferred tax assets, net	44,797	70,996
Deferred tax liabilities:
Acquired intangible assets	16,621	20,656
Depreciation and amortization	4,969	4,604
Leases	3,166
Long-term debt	5,741	8,080
Prepaid expenses and other	2,424	2,142
Deferred tax liabilities	32,921	35,482
Net deferred tax assets	$ 11,876	$ 35,514