XML 112 R96.htm IDEA: XBRL DOCUMENT v3.3.1.900
Income taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Tax Credit Carryforward, Expiration Date Jan. 01, 2029    
Valuation Allowance, Amount $ 9,347 $ 5,332 $ 4,280
Significant Change in Unrecognized Tax Benefits, Nature of Event Timing Jan. 01, 2015    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 0 $ 0  
Unrecognized Tax Benefits Realized In Next 12 Months 1,300    
Internal Revenue Service (IRS) [Member]      
Open Tax Year   2007  
US | State and Local Jurisdiction [Member]      
Operating Loss Carryforwards 10,200 $ 8,100  
Research Tax Credit Carryforward [Member] | US      
Tax Credit Carryforward, Amount 300 300  
Research Tax Credit Carryforward [Member] | CA      
Tax Credit Carryforward, Amount 100 700  
Research Tax Credit Carryforward [Member] | MA [Member]      
Tax Credit Carryforward, Amount 700 700  
Scientific [Member] | CA      
Tax Credit Carryforward, Amount 0 4,500  
Capital Loss Carryforward [Member] | US      
Operating Loss Carryforwards 29,700 1,500  
Capital Loss Carryforward [Member] | CA      
Operating Loss Carryforwards $ 100 $ 100