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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 23, 2016
Apr. 01, 2017
Dec. 31, 2016
Jul. 01, 2017
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  
Common Stock        
Common stock shares issued 9,200,000      
Common stock issued, price per share $ 1.25      
Proceeds from issuance of common stock $ 10.3      
Stock-Based Compensation        
Shares authorized for issuance   10,205,566    
Automatic annual increase in shares authorized as percentage of common stock outstanding   2.50% 5.00%  
Automatic annual increase in shares authorized, subject to adjustment for corporate actions   1,200,000 1,200,000  
Shares available for issuance   743,700    
Rate of vesting of options granted   25.00%    
Vesting period of options granted, in years   4 years    
Expiration of vested options, period from date of grant   10 years    
Subsequent Event        
Stock-Based Compensation        
Shares authorized for issuance       1,000,000