Income Taxes (Tables)

12 Months Ended

Dec. 28, 2019

Income Tax Disclosure [Abstract]

Schedule of Geographic Breakdown of Provision for (Benefit from) Income Taxes

The following is a geographic breakdown of the provision for/(benefit from) income taxes (in thousands):

 

	Years Ended
	December 28, 2019			December 29, 2018			December 30, 2017
Current:
Federal	$	—		$	—		$	—
State	288			186			69
Foreign	3,046			6,832			4,679
Total current	$	3,334		$	7,018		$	4,748
Deferred:
Federal	$	369		$	(546	)	$	—
State	—			—			—
Foreign	(740		)	(7,127		)	(6,178		)
-	$	(371	)	$	(7,673	)	$	(6,178	)
Total provision for/(benefit from) income taxes	$	2,963		$	(655	)	$	(1,430	)

Schedule of Provisions for Income Taxes Computed by Applying Statutory Federal Income Tax Rates

The provisions for (benefit from) income taxes differ from the amount computed by applying the statutory federal income tax rates as follows: 

	Years Ended
	December 28, 2019		December 29, 2018		December 30, 2017
Expected tax at federal statutory rate	21.0	%	21.0	%	35.0	%
State taxes, net of federal benefit	(0.1	)%	(0.1	)%	—	%
Research credits	1.0	%	1.8	%	1.8	%
Stock-based compensation	(2.0	)%	(0.8	)%	(6.0	)%
Change in valuation allowance	(19.7	)%	(18.1	)%	(26.8	)%
Foreign rate differential	(0.2	)%	(2.9	)%	(3.3	)%
Other	(0.8	)%	(0.6	)%	—	%
Effective tax rate	(0.8	)%	0.3	%	0.7	%

Schedule of Deferred Tax Assets and Liabilities

Deferred tax assets and liabilities are recognized for the future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax basis using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant deferred tax assets and liabilities consist of the following (in thousands):

	Years Ended
	December 29, 2019			December 29, 2018
Deferred tax assets:
Net operating losses	$	301,929		$	257,928
Research and foreign tax credits	121,065			221,943
Nondeductible accruals	72,094			50,312
Inventory valuation	31,982			39,430
Property, plant and equipment	4,601			2,591
Leasing Liabilities	19,265			—
Stock-based compensation	3,998			4,825
Total deferred tax assets	$	554,934		$	577,029
Valuation allowance	(484,834		)	(493,157		)
Net deferred tax assets	$	70,100		$	83,872
Deferred tax liabilities:
Accrual and reverse - lease	—			(16,802		)
Depreciation	—			(199		)
Accruals, reserves and prepaid expenses	(830		)	(784		)
Right of use asset	(16,261		)	—
Acquired intangible assets	(34,542		)	(49,406		)
Convertible senior notes	(25,417		)	(29,419		)
Total deferred tax liabilities	$	(77,050	)	$	(96,610	)
Net deferred tax liabilities	$	(6,950	)	$	(12,738	)

Schedule of Aggregate Changes in Balance of Gross Unrecognized Tax Benefits

The aggregate changes in the balance of gross unrecognized tax benefits were as follows (in thousands): 

	December 29, 2019			December 29, 2018			December 30, 2017
Beginning balance	$	24,617		$	19,786		$	22,282
Tax position related to current year
Additions	1,965			2,296			2,234
Tax positions related to prior years
Additions	18,212			2,981			—
Reductions	(542		)	(40		)	(4,728		)
Lapses of statute of limitations	(160		)	(406		)	(2		)
Ending balance	$	44,092		$	24,617		$	19,786