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Income Taxes (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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