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Income Taxes (Tables)

12 Months Ended

Dec. 28, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The Income tax benefit (provision) was as follows (in thousands):

	Year Ended December 31,
	2018				2017				2016
Current:
Federal	$	—			$	—			$	—
State	(6,133		)		(4,350		)		—
Total current tax expense	(6,133		)		(4,350		)		—
Deferred:
Federal	238,675				—				—
State	5,436				—				—
Total deferred tax expense	244,111				—				—
Income tax benefit (provision)	$	237,978			$	(4,350	)		$	—

Schedule of Reconciliation of Income Taxes At The Statutory Federal Income Tax Rate to Net Income Taxes

The reconciliation of the U.S. federal income tax (provision) benefit at the statutory federal income tax rates of 21%, 34% and 34% for the years ended December 31, 2018, 2017 and 2016, respectively, to our Income tax benefit (provision) was as follows (in thousands):

	Year Ended December 31,
	2018				2017				2016
U.S. federal income tax (provision) benefit at statutory rate	$	(94,939	)		$	(53,916	)		$	23,876
State tax expense	(4,690		)		(8,282		)		(6,520		)
Change in valuation allowance	315,394				34,266				(6,377		)
Research credits	18,308				—				—
Stock-based compensation	5,998				20,548				(3,155		)
Non-deductible interest	—				(1,367		)		(2,680		)
Debt extinguishment	—				—				(4,726		)
Other	(2,093		)		4,401				(418		)
Income tax benefit (provision)	$	237,978			$	(4,350	)		$	—

Schedule of Deferred Assets and Liabilities

Our deferred tax assets and liabilities were as follows (in thousands):

	December 31,
	2018				2017
Deferred tax assets:
Net operating loss carryforwards	$	146,701			$	244,205
Tax credit carryforwards	98,467				66,770
Book over tax depreciation and amortization	29,929				39,472
Amortization of deferred stock compensation – non-qualified	11,366				8,966
Accruals and reserves not currently deductible	10,425				4,914
Deferred revenue	5,474				53,543
Other assets	1,140				1,088
Total deferred tax assets	303,502				418,958
Valuation allowance	(58,112		)		(418,958		)
Net deferred tax assets	245,390				—
Deferred tax liabilities:
Operating lease right-of-use assets	(1,279		)		—
Total deferred tax liabilities	(1,279		)		—
Net deferred taxes	$	244,111			$	—

Schedule of Unrecognized Tax Benefits

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):

	Year Ended December 31,
	2018				2017				2016
Beginning balance	$	79,342			$	61,809			$	88,638
Change relating to prior year provision	(4,254		)		247				(29,110		)
Change relating to current year provision	1,083				17,378				2,304
Reductions based on the lapse of the applicable statutes of limitations	(111		)		(92		)		(23		)
Ending balance	$	76,060			$	79,342			$	61,809

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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