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Stockholders' Equity - Common Stock (Details) - USD ($)
 6 Months Ended
Jul. 25, 2018
Jun. 01, 2018
Nov. 28, 2017
May 31, 2017
Apr. 11, 2017
Dec. 22, 2016
Jun. 30, 2018
Jun. 30, 2017
May 23, 2018
Dec. 31, 2017
Common Stock [Abstract]                    
Common stock issued (in shares) 6,723   10,000              
Proceeds from sale of common stock, net             $ (200,000) $ 11,225,000    
Common stock, par value (in dollars per share)             $ 0.001   $ 0.001 $ 0.001
Common Stock [Member]                    
Common Stock [Abstract]                    
Common stock issued (in shares) 6,723   10,000              
Share issued, price per share         $ 11.00          
Common Stock [Member] | Maxim Group LLC [Member]                    
Common Stock [Abstract]                    
Common stock issued (in shares)       84,900 900,000          
Proceeds from sale of common stock, net       $ 800,000 $ 8,700,000          
Common stock, par value (in dollars per share)         $ 0.001          
Share issued, price per share       $ 11.00 $ 10.40          
Closing of offering date         Apr. 17, 2017          
Number of days granted as option to purchase additional shares of common stock to underwriter         45 days          
Additional shares of common stock         94,400          
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member]                    
Common Stock [Abstract]                    
Common stock issued, value           $ 20,000,000        
Period exercisable from the date of issuance           30 months        
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]                    
Common Stock [Abstract]                    
Common stock issued, value           $ 200,000        
Common stock issued (in shares)           199,472        
Proceeds from sale of common stock, net           $ 1,700,000        
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | ATM Program [Member]                    
Common Stock [Abstract]                    
Common stock, par value (in dollars per share)   $ 0.001                
Common Stock [Member] | Securities Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]                    
Common Stock [Abstract]                    
Common stock issued (in shares)           12,742        
Trading Volume of Common Shares           0        
Common stock issued (in shares)           38,226        
Common Stock [Member] | Maximum [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]                    
Common Stock [Abstract]                    
Floor price of per share           $ 5.00        
Common Stock [Member] | Maximum [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | ATM Program [Member]                    
Common Stock [Abstract]                    
Proceeds from sale of common stock, net   $ 6,500,000                
Common Stock [Member] | Maximum [Member] | Single Regular Purchase [Member] | Lincoln Park Capital Fund, LLC [Member]                    
Common Stock [Abstract]                    
Common stock issued (in shares)           10,000        
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