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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Tax Cuts and Jobs Act of 2017, Remeasurement of Deferred for Reduction in Corporate Tax Rate, Income Tax Expense (Benefit) | $ 25,100,000 |  |
Unrecognized Tax Benefits | 394,000 | $ 394,000 | $ 374,000
Unrecognized Tax Benefits, Period Increase (Decrease) | 0 | 20,000 |
Income (Loss) from Continuing Operations before Income Taxes, Foreign | 700,000 | (400,000) | 5,400,000
Deferred Tax Assets, Valuation Allowance | 58,006,000 | 50,642,000 |
Current: |  |  |
State | 5,000 | 5,000 | 33,000
Current Foreign Tax Expense (Benefit) | 25,000 | (568,000) | 1,656,000
Total current provision | 30,000 | (563,000) | 1,689,000
Deferred: |  |  |
Federal | (7,307,000) | 15,461,000 | (8,718,000)
State | (360,000) | (493,000) | (1,264,000)
Foreign | 300,000 | (187,000) | 2,308,000
Change in valuation allowance | 7,367,000 | (17,181,000) | 9,115,000
Total deferred provision | 0 | (2,400,000) | 1,441,000
Income Tax Expense (Benefit) | 30,000 | (2,963,000) | 3,130,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax provision at federal statutory rates | (7,515,000) | (9,884,000) | (6,965,000)
State tax liability | 5,000 | 5,000 | 22,000
Foreign deferred tax rate differential | (39,000) | 15,000 | (678,000)
Foreign withholding | (301,000) | (771,000) | (1,441,000)
Outside basis in Kowon, net unremitted earnings | (468,000) | (2,888,000) | 958,000
Non-deductible expenses | 186,000 | 774,000 | 259,000
Increase in net state operating loss carryforwards | (406,000) | (300,000) | (502,000)
Other Income Tax Expense (Benefit), Continuing Operations | 0 | 0 | (142,000)
Provision to tax return adjustments and tax rate change (1) | (76,000) | 24,833,000 | (66,000)
Tax credits | 239,000 | 24,000 | 762,000
Effective Income Tax Rate Reconciliation, Deduction, Amount | 13,000 | 199,000 | 0
Non-deductible equity compensation | 290,000 | 1,901,000 | (360,000)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 91,000 | 203,000 | 671,000
Other, net | 45,000 | 107,000 | 139,000
Change in valuation allowance | 7,364,000 | (17,181,000) | 9,115,000
Income Tax Expense (Benefit) | 30,000 | (2,963,000) | 3,130,000
Deferred tax liability: |  |  |
Foreign withholding liability | (538,000) | (812,000) |
Foreign unremitted earnings | 0 | (468,000) |
Deferred Tax Assets, Goodwill and Intangible Assets | 0 | (259,000) |
Deferred Tax assets: |  |  |
Federal net operating loss carryforwards | 41,755,000 | 34,555,000 |
State net operating loss carryforwards | 3,114,000 | 2,708,000 |
Foreign net operating loss carryforwards | 1,259,000 | 1,500,000 |
Equity awards | 444,000 | 55,000 |
Tax credits | 7,231,000 | 7,470,000 |
Equipment | 640,000 | 544,000 |
Investments | 1,848,000 | 1,792,000 |
Deferred Tax Assets, Other Tax Carryforwards | 1,707,000 | 3,037,000 |
Net deferred tax assets | 57,460,000 | 50,122,000 |
Deferred Tax Assets, Net, Noncurrent | (546,000) | (520,000) |
Income Tax Expense (Benefit) | 30,000 | (2,963,000) | $ 3,130,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 500,000 | $ 500,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 1,000,000.0 |  |
Estimated Applicable Foreign Tax Rate | 15.50% |  |
Maximum |  |  |
Deferred Tax assets: |  |  |
The state impact of any federal changes, subject to examination by various states (in years) | 1 year |  |
International jurisdictions | Minimum |  |  |
Deferred Tax assets: |  |  |
Income tax returns examination period | 3 years |  |
International jurisdictions | Maximum |  |  |
Deferred Tax assets: |  |  |
Income tax returns examination period | 20 years |  |
Federal |  |  |
Deferred Tax assets: |  |  |
Net operating loss carryforwards available for tax purposes | $ 198,800,000 |  |
State | Minimum |  |  |
Deferred Tax assets: |  |  |
Income tax returns examination period | 3 years |  |
State | Maximum |  |  |
Deferred Tax assets: |  |  |
Income tax returns examination period | 5 years |  |

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