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Income Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 14, 2013
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Current:        
Federal   $ 0 $ 0 $ (13,124,000)
State   50,000 50,000 12,000
Foreign $ 1,200,000 0 0 (34,000)
Other Tax Expense (Benefit)   50,000 50,000 (13,146,000)
Total current provision   (25,000) (180,000) (12,933,209)
Deferred:        
Federal   (5,356,000) (9,554,000) (3,616,000)
State   (62,000) (1,709,000) 644,000
Foreign   188,000 411,000 (565,000)
Change in valuation allowance   5,155,000 10,622,000 3,750,000
Total deferred provision   (75,000) (230,000) 213,000
Total (benefit) provision for income taxes   (25,000) (180,000) (12,933,000)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Tax provision at federal statutory rates   (5,187,000) (9,964,000) (13,322,000)
State tax liability   33,000 33,000 8,000
Foreign deferred   153,000 371,000 (644,000)
Foreign withholding   (75,000) (196,000) 308,000
Outside basis in KTC and Kowon, net   (180,000) (394,000) (202,000)
Goodwill   0 0 0
Non-deductible expenses   (402,000) (21,000) 306,000
Increase in net state operating loss carryforwards   (158,000) (177,000) (2,868,000)
Utilization of NOL for R&D refund   719,000 1,089,000 0
Provision to tax return adjustments and state tax rate change   264,000 (516,000) (33,000)
Tax credits   (501,000) (610,000) (390,000)
Effective Income Tax Rate Reconciliation, Deduction, Amount   40,000 196,000 558,000
Non-deductible equity compensation   (34,000) (687,000) (418,000)
Other, net   148,000 74,000 14,000
Change in valuation allowance   5,155,000 10,622,000 3,750,000
Total (benefit) provision for income taxes   (25,000) (180,000) (12,933,000)
Deferred tax liability:        
Intangible asset   0 0  
Foreign withholding liability   (1,207,000) (1,282,000)  
Foreign unremitted earnings   (2,701,000) (2,882,000)  
Deferred Tax assets:        
Federal net operating loss carryforwards   28,984,000 22,758,000  
State net operating loss carryforwards   1,913,000 1,689,000  
Foreign net operating loss carryforwards   2,430,000 2,612,000  
Equity awards   2,249,000 2,508,000  
Tax credits   6,768,000 6,267,000  
Equipment   1,113,000 1,024,000  
Investments   3,240,000 5,279,000  
Other   3,667,000 3,253,000  
Net deferred tax assets   46,456,000 41,226,000  
Valuation allowance   (47,663,000) (42,508,000)  
Net deferred tax assets after deducting valuation allowance   (1,207,000) (1,282,000)  
Pretax foreign (losses) earnings   (968,000) (2,588,000) (4,966,000)
Total (benefit) provision for income taxes   (25,000) (180,000) $ (12,933,000)
Increase (decrease) in valuation allowance   5,200,000    
Unrecorded benefits from stock award   10,300,000    
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation   $ 2,700,000    
Maximum        
Deferred Tax assets:        
The state impact of any federal changes, subject to examination by various states (in years)   1 year    
Segments excluding KTC        
Deferred Tax assets:        
Increase (decrease) in valuation allowance     10,600,000  
Utiilzation of operating loss carryforwards     $ 21,400,000  
International jurisdictions | Minimum        
Deferred Tax assets:        
Income tax returns examination period   3 years    
International jurisdictions | Maximum        
Deferred Tax assets:        
Income tax returns examination period   7 years    
Federal        
Deferred Tax assets:        
Net operating loss carryforwards available for tax purposes   $ 82,800,000    
State | Minimum        
Deferred Tax assets:        
Income tax returns examination period   3 years    
State | Maximum        
Deferred Tax assets:        
Income tax returns examination period   5 years