Income Taxes - Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 12,925	$ 21,187
Research and development tax credit carryforwards	12,322	15,068
Stock-based compensation	5,256	7,396
Capitalized research and development	3,468	6,802
Deferred income on shipments to distributors	7,070	9,338
Expected future cost-sharing adjustment	19,961	29,719
Accrued liabilities and other	8,620	11,321
Deferred tax assets	69,622	100,831
Less: Valuation allowance	(6,518)	(12,361)
Deferred tax assets, net	63,104	88,470
Deferred tax liabilities:
Acquired intangible assets	13,884	25,785
Depreciation and amortization	1,274	2,939
Unremitted foreign earnings for expected future cost-sharing adjustment		31,165
Convertible debt	10,351
Prepaid expenses and other	1,421	3,069
Deferred tax liabilities	26,930	62,958
Net deferred tax assets	$ 36,174	$ 25,512