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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Aug. 10, 2018
Jul. 11, 2018
May 18, 2018
Nov. 14, 2017
Aug. 22, 2017
Apr. 17, 2017
Jan. 01, 2017
Jan. 01, 2016
Jun. 30, 2018
Dec. 30, 2017
Mar. 31, 2018
May 31, 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    
Number of Shares Issued when Right is Exercised           0.001            
Purchase price per share     $ 0.148   $ 0.60 $ 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                 150,000,000 150,000,000   90,000,000
Common stock shares issued     5,405,405   8,500,000              
Proceeds from issuance of common stock     $ 800   $ 4,400       $ 4,612      
Stock-Based Compensation                        
Shares available for issuance                 2,248,817      
Shares authorized for issuance                 12,605,566      
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      
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 1,000,000    
Preferred Stock, Par or Stated Value Per Share                 $ 0.001 $ 0.001    
Preferred Stock, Shares Outstanding                   0 0  
Stock-Based Compensation                        
Shares available for issuance           1,000,000            
ATM Program                        
Common Stock                        
Service fee percentage       3.00%                
Common stock shares issued       25,983,098         17,088,876 25,983,098    
Aggregate gross proceeds agent can sell shares of stock       $ 9,000                
Proceeds from issuance of common stock       $ 6,600         $ 3,800 $ 6,600    
ATM Program | Subsequent Event                        
Common Stock                        
Common stock shares issued 8,978,094 8,978,094                    
Proceeds from issuance of common stock $ 1,300 $ 1,300