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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Income Taxes [Line Items]        
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions   $ 200,000    
Income (Loss) from Continuing Operations before Income Taxes, Foreign   (400,000) $ 5,400,000 $ (1,000,000)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 25,100,000    
Estimated Applicable Foreign Tax Rate   15.50%    
Current:        
State   $ 5,000 33,000 50,000
Current Foreign Tax Expense (Benefit)   (568,000) 1,656,000 0
Other Tax Expense (Benefit)   (563,000) 1,689,000 50,000
Deferred:        
Federal   15,461,000 (8,718,000) (5,356,000)
State   (493,000) (1,264,000) (62,000)
Foreign   (187,000) 2,308,000 188,000
Change in valuation allowance   (17,181,000) 9,115,000 5,155,000
Total deferred provision   (2,400,000) 1,441,000 (75,000)
Total (benefit) provision for income taxes   2,963,000 (3,130,000) 25,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Tax provision at federal statutory rates   (9,884,000) (6,965,000) (5,187,000)
State tax liability   5,000 22,000 33,000
Foreign deferred tax rate differential   15,000 (678,000) 153,000
Foreign withholding   (771,000) 1,441,000 (75,000)
Outside basis in Kowon, net unremitted earnings   (2,888,000) 958,000 (180,000)
Non-deductible expenses   774,000 259,000 (402,000)
Increase in net state operating loss carryforwards   (300,000) (502,000) (158,000)
Other Income Tax Expense (Benefit), Continuing Operations   0 (142,000) 719,000
Provision to tax return adjustments and state tax rate change   24,833,000 (66,000) 264,000
Alternative Minimum Tax Refund   1,034,000    
Tax credits   24,000 762,000 501,000
Effective Income Tax Rate Reconciliation, Deduction, Amount   199,000 0 40,000
Non-deductible equity compensation   1,901,000 (360,000) (34,000)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount   203,000 671,000 0
Other, net   107,000 139,000 148,000
Change in valuation allowance   (17,181,000) 9,115,000 5,155,000
Total (benefit) provision for income taxes   2,963,000 (3,130,000) 25,000
Provision for Other Losses   300,000    
Deferred tax liability:        
Foreign withholding liability   (812,000) (2,571,000)  
Foreign unremitted earnings   (468,000) (3,659,000)  
Deferred Tax Liabilities, Intangible Assets   (259,000) 0  
Deferred Tax assets:        
Federal net operating loss carryforwards   34,555,000 46,968,000  
State net operating loss carryforwards   2,708,000 2,129,000  
Foreign net operating loss carryforwards   1,500,000 1,375,000  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost   55,000 2,258,000  
Tax credits   7,470,000 7,495,000  
Equipment   544,000 814,000  
Investments   1,792,000 3,535,000  
Deferred Tax Assets, Other Tax Carryforwards   3,037,000 5,823,000  
Net deferred tax assets   50,122,000 64,167,000  
Valuation allowance   (50,642,000) (66,738,000)  
Deferred Tax Assets, Net, Noncurrent   (520,000) (2,571,000)  
Total (benefit) provision for income taxes   2,963,000 (3,130,000) 25,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense   491,000 307,000  
Unrecognized Tax Benefits   394,000 374,000 $ 0
Unrecognized Tax Benefits, Period Increase (Decrease)   $ 20,000 $ 374,000  
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   $ 164,500,000    
State | Minimum        
Deferred Tax assets:        
Income tax returns examination period   3 years    
State | Maximum        
Deferred Tax assets:        
Income tax returns examination period   5 years    
NVIS, Inc.        
Income Taxes [Line Items]        
Deferred Tax Liabilities, Net   $ 1,100,000    
Scenario, Forecast        
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%