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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Taxes [Line Items]      
Proceeds from AMT Refund $ 500,000    
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 $ 394,000 394,000
Unrecognized Tax Benefits, Period Increase (Decrease) 0 0  
Income (Loss) from Continuing Operations before Income Taxes, Foreign 1,300,000 700,000 (400,000)
Deferred Tax Assets, Valuation Allowance 65,566,000 58,006,000  
Current:      
State 4,000 5,000 5,000
Current Foreign Tax Expense (Benefit) 104,000 25,000 (568,000)
Total current provision 108,000 30,000 (563,000)
Deferred:      
Federal (5,165,000) (7,307,000) 15,461,000
State (2,341,000) (360,000) (493,000)
Foreign (56,000) 300,000 (187,000)
Change in valuation allowance 7,562,000 7,367,000 (17,181,000)
Total deferred provision 0 0 (2,400,000)
Income Tax Expense (Benefit) 108,000 30,000 (2,963,000)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Tax provision at federal statutory rates (6,196,000) (7,515,000) (9,884,000)
State tax liability 4,000 5,000 5,000
Foreign deferred tax rate differential (64,000) (39,000) 15,000
Foreign withholding 0 (301,000) (771,000)
Outside basis in Kowon, net unremitted earnings 0 (468,000) (2,888,000)
Non-deductible expenses 1,964,000 186,000 774,000
Increase in net state operating loss carryforwards (1,985,000) (406,000) (300,000)
Other Income Tax Expense (Benefit), Continuing Operations (148,000) 0 0
Provision to tax return adjustments and tax rate change (1) 803,000 (76,000) 24,833,000
Tax credits (1,931,000) (239,000) (24,000)
Effective Income Tax Rate Reconciliation, Deduction, Amount 0 13,000 199,000
Non-deductible equity compensation 16,000 290,000 1,901,000
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount 105,000 91,000 203,000
Other, net (22,000) 45,000 107,000
Change in valuation allowance 7,562,000 7,364,000 (17,181,000)
Income Tax Expense (Benefit) 108,000 30,000 (2,963,000)
Deferred tax liability:      
Foreign withholding liability (525,000) (538,000)  
Deferred Tax assets:      
Federal net operating loss carryforwards 44,820,000 41,755,000  
State net operating loss carryforwards 5,097,000 3,114,000  
Foreign net operating loss carryforwards 1,293,000 1,259,000  
Equity awards 428,000 444,000  
Tax credits 9,161,000 7,231,000  
Equipment 524,000 640,000  
Investments 2,641,000 1,848,000  
Deferred Tax Assets, Other Tax Carryforwards 1,603,000 1,707,000  
Net deferred tax assets 65,042,000 57,460,000  
Deferred Tax Assets, Net, Noncurrent (524,000) (546,000)  
Income Tax Expense (Benefit) 108,000 30,000 $ (2,963,000)
Unrecognized Tax Benefits, Interest on Income Taxes Expense 800,000 $ 500,000  
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 1,000,000.0    
AMT Receivable, Current $ 300,000    
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 $ 160,500,000    
Operating Loss Carryforwards, Unlimited $ 52,900,000    
State | Minimum      
Deferred Tax assets:      
Income tax returns examination period 3 years    
State | Maximum      
Deferred Tax assets:      
Income tax returns examination period 5 years