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Stockholders' Equity - Common Stock (Details) - USD ($)
 12 Months Ended
Nov. 28, 2017
Dec. 22, 2016
Jun. 16, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 15, 2016
May 11, 2016
May 10, 2016
Common Stock [Abstract]                
Each unit consist of number of warrant     3,352,306          
Number of shares callable by warrants (in shares)           1 1,100,000 16,000,000
Warrant exercise price (in dollars per share)           $ 3.06    
Common stock issued (in shares) 10,000   6,704,852          
Common stock issued, value       $ 12,716,000 $ 19,478,000      
Proceeds from sale of common stock, net       $ 23,613,000 $ 21,467,000      
Common Stock [Member]                
Common Stock [Abstract]                
Common Stock Subscription Price       $ 2.55        
Each unit consist of number of common stock       1        
Each unit consist of number of warrant       0.5        
Number of shares callable by warrants (in shares)       1        
Warrant exercise price (in dollars per share) $ 0.3333     $ 3.06        
Period exercisable from the date of issuance       30 months        
Common stock issued (in shares) 10,000   6,704,852 12,237,079 8,673,253      
Gross proceeds from private placement of stock     $ 15,300,000          
Redemption price of warrant prior to expiration       $ 0.01        
Common stock price per share for warrant redemption       $ 7.65        
Number of consecutive trading days for warrant redemption       10 days        
Common stock issued, value       $ 12,000 $ 9,000      
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member]                
Common Stock [Abstract]                
Period exercisable from the date of issuance   30 months            
Common stock issued, value   $ 20,000,000            
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]                
Common Stock [Abstract]                
Common stock issued (in shares)   1,900,000            
Common stock issued, value   $ 200,000            
Proceeds from sale of common stock, net   $ 1,700,000            
Common Stock [Member] | Securities Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]                
Common Stock [Abstract]                
Common stock issued (in shares)   127,419            
Trading Volume of Common Shares   0            
Common stock issued (in shares)   382,258            
Common Stock [Member] | Maximum [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]                
Common Stock [Abstract]                
Floor price of per share   $ 0.50            
Common Stock [Member] | Maximum [Member] | Single Regular Purchase [Member] | Lincoln Park Capital Fund, LLC [Member]                
Common Stock [Abstract]                
Common stock issued (in shares)   100,000            
Common Stock [Member] | Minimum [Member] | Lincoln Park Capital Fund, LLC [Member]                
Common Stock [Abstract]                
Beneficial ownership percentage of common stock outstanding   9.99%            
Common Stock [Member] | Minimum [Member] | Single Regular Purchase [Member] | Lincoln Park Capital Fund, LLC [Member]                
Common Stock [Abstract]                
Common stock issued, value   $ 1,000,000