Income Taxes - Deferred Income Taxes Differences Between Carrying Amounts of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Deferred tax assets:
Net operating losses	$ 77,670	$ 67,973
Research credits	47,405	42,093
Nondeductible accruals	42,507	38,978
Inventory valuation	30,449	21,550
Property, plant and equipment	1,692	989
Intangible assets	119	796
Stock-based compensation	9,412	9,299
Total deferred tax assets	209,254	181,678
Valuation allowance	(200,476)	(169,240)
Net deferred tax assets	8,778	12,438
Deferred tax liabilities:
Depreciation	(239)	(232)
Accruals, reserves and prepaid expenses	(4,008)	(3,874)
Acquired intangible assets	(24,088)	(34,894)
Convertible senior notes	(5,653)	(9,070)
Total deferred tax liabilities	(33,988)	(48,070)
Net deferred tax liabilities	$ (25,210)	$ (35,632)