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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Apr. 17, 2017
Sep. 28, 2019
Sep. 29, 2018
Jun. 29, 2019
Dec. 29, 2018
Serial Preferred Stock          
Preferred Stock, Shares Authorized   10,000,000     10,000,000
Preferred Stock, Par or Stated Value Per Share   $ 0.001     $ 0.001
Preferred Stock, Shares Outstanding   0     0
Number of Rights Authorized for Each Outstanding Share of Stock 1        
Number of Shares Issued when Right is Exercised 0.001        
Purchase price per share $ 6.56        
Number of Days Rights are to be Distributed 10 days        
Minimum Beneficial Ownership Percentage for Rights to be Distributed 15.00%        
Common Stock          
Common stock, shares authorized   300,000,000     300,000,000
Proceeds from issuance of common stock   $ 2,457 $ 15,764    
Exercise price of warrants   $ 0.62      
Stock-Based Compensation          
Shares available for issuance       1,160,322  
Shares authorized for issuance       13,805,566  
Unearned stock-based compensation   $ 1,800      
Weighted-average period over which unearned stock-based compensation is expected to be recognized   3 years      
Series A Preferred Stock          
Serial Preferred Stock          
Preferred Stock, Shares Authorized   1,000,000     1,000,000
Preferred Stock, Par or Stated Value Per Share   $ 0.001     $ 0.001
Stock-Based Compensation          
Shares available for issuance 1,000,000