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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 11, 2019
Apr. 30, 2019
Mar. 31, 2019
Feb. 28, 2018
Subsequent Event [Line Items]        
Outstanding warrants to purchase (in shares)     3,750,833  
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Public offering price in the Offering (in usd per share) $ 1.10      
Gross proceeds received in public offering   $ 5.2    
Public Stock Offering [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Number of shares issued in the Offering (in shares) 4,575,000      
Underwritten Offering [Member]        
Subsequent Event [Line Items]        
Exercise price (in usd per share)       $ 3.00
Underwritten Offering [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Number of shares issued in the Offering (in shares) 686,250      
Public Stock Offering, Including Over-Allotment Of Shares [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Number of shares issued in the Offering (in shares) 5,261,250      
Gross proceeds received in public offering $ 5.8      
Proceeds received in public offering, net of underwriting discounts and offering expenses $ 5.2      
Warrants Expiring on February 15, 2023 [Member]        
Subsequent Event [Line Items]        
Outstanding warrants to purchase (in shares)     3,720,500  
Exercise price (in usd per share)     $ 3.00  
Warrants Expiring on February 15, 2023 [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Public offering price in the Offering (in usd per share) $ 0.98      
Exercise price (in usd per share) $ 0.98