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Stockholders' Equity - Common Stock (Details) - USD ($)
 3 Months Ended 7 Months Ended 10 Months Ended 12 Months Ended
Sep. 21, 2018
Jul. 25, 2018
Jun. 01, 2018
Nov. 28, 2017
May 31, 2017
Apr. 11, 2017
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Stock [Abstract]                          
Common stock issued (in shares)   6,723   10,000                  
Proceeds from sale of common stock, net             $ 1,919,000   $ (150,000)     $ 0 $ 0
Common stock issued, value             $ 1,873,000   $ 27,000     $ 1,624,000 $ 12,716,000
Common Stock [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)   6,723   10,000     139,855   201     92,169 24,474
Share issued, price per share           $ 550.00              
Common Stock [Member] | Maxim Group LLC [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)         1,698 17,881              
Share issued, price per share         $ 550.00 $ 520.00              
Proceeds from sale of common stock, net         $ 800,000 $ 8,700,000              
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           1,888              
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)                   1,584 200,000    
Proceeds from sale of common stock, net                   $ 1,700,000 $ 3,800,000    
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | Maximum [Member]                          
Common Stock [Abstract]                          
Proceeds from sale of common stock, net     $ 6,500,000                    
Common Stock [Member] | B. Riley FBR [Member] | ATM Program [Member] | Sales Agreement [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)                   79,234 200,000    
Proceeds from sale of common stock, net                   $ 1,700,000      
Proceeds from sale of common stock, net             $ 3,800,000       $ 3,800,000    
Common Stock [Member] | B. Riley FBR [Member] | ATM Program [Member] | Sales Agreement [Member] | Maximum [Member]                          
Common Stock [Abstract]                          
Proceeds from sale of common stock, net     $ 6,500,000                    
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member]                          
Common Stock [Abstract]                          
Common stock issued, value $ 5,000,000                        
Period exercisable from the date of issuance 24 months                        
Common stock issued (in shares)             0            
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Securities Purchase Agreement [Member]                          
Common Stock [Abstract]                          
Trading Volume of Common Shares 0                        
Upper Limit on the Price Per Share $ 0                        
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member]                          
Common Stock [Abstract]                          
Beneficial ownership percentage of common stock outstanding 4.99%                        
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member] | Single Regular Purchase [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares) 5,000                        
Common stock issued (in shares) 5,000                        
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Minimum [Member] | Single Regular Purchase [Member]                          
Common Stock [Abstract]                          
Common stock issued, value $ 1,000,000                        
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)               12,802          
Proceeds from sale of common stock, net               $ 300,000          
Common stock issued (in shares)               12,802          
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] | Maximum [Member]                          
Common Stock [Abstract]                          
Floor price of per share $ 12.50