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Common Stock Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Jul. 15, 2014
May 12, 2014
Apr. 30, 2014
Post-Reverse-Split Basis [Member]          
Class of Warrant or Right [Line Items]          
Warrants issued 0.591        
Warrant, shares 111,463        
Series B Preferred Stock [Member]          
Class of Warrant or Right [Line Items]          
Preferred stock, share issued 0 0      
Common Stock          
Class of Warrant or Right [Line Items]          
Warrants issued 1,152,125        
Warrant, exercise period 5 years        
Warrant, expiration date Jul. 15, 2019        
Common Stock | Post-Reverse-Split Basis [Member]          
Class of Warrant or Right [Line Items]          
Warrants issued 209,477        
Exercise price of warrant $ 10.18        
Private Placement [Member] | Series B Preferred Stock [Member]          
Class of Warrant or Right [Line Items]          
Warrants issued 2.00        
Warrant, value $ 700        
Warrant, shares 28,000        
Preferred stock, share issued 480,000   480,000 480,000 480,000
Private Placement [Member] | Series B Preferred Stock [Member] | Post-Reverse-Split Basis [Member]          
Class of Warrant or Right [Line Items]          
Warrants issued 0.364        
Private Placement [Member] | Common Stock          
Class of Warrant or Right [Line Items]          
Warrants issued 3.25        
Warrant, value $ 700        
Warrant, shares 28,000