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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Apr. 17, 2017
Jan. 01, 2017
Sep. 23, 2016
Jan. 01, 2016
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
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   $ 1.25        
Distribution date for the Rights 10 days            
Minimum Beneficial Ownership Percentage for Rights to be Distributed 15.00%            
Common Stock              
Common stock, shares authorized         150,000,000 90,000,000 150,000,000
Common stock shares issued     9,200,000        
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    
Shares available for issuance         651,159    
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    
Series A Preferred Stock              
Serial Preferred Stock              
Preferred Stock, Shares Authorized         1,000,000