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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    
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