Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Class of Stock [Line Items]    
Gross Proceeds $ 1,850 $ 1,489
Common Stock [Member]    
Class of Stock [Line Items]    
Gross Proceeds $ 2,312 $ 1,472
Common Stock [Member] | March 27, 2019 [Member]    
Class of Stock [Line Items]    
Shares [1] 1,438,356  
Gross Proceeds $ 2,100  
Common Stock [Member] | January 1, 2019 through September 30, 2019 [Member]    
Class of Stock [Line Items]    
Shares [2] 111,129  
Gross Proceeds $ 212  
Common Stock [Member] | April 29, 2018 [Member]    
Class of Stock [Line Items]    
Shares [3] 806,452  
Gross Proceeds $ 1,000  
Common Stock [Member] | April 4 through April 23, 2018 [Member]    
Class of Stock [Line Items]    
Shares [4] 131,225  
Gross Proceeds $ 176  
Common Stock [Member] | January 19, 2018 [Member]    
Class of Stock [Line Items]    
Shares [5] 140,295  
Gross Proceeds $ 296  
[1] Shares issued pursuant to a private placement with accredited investors for $1.46 per share.
[2] Shares of common stock sold for between $1.85 and $2.00 per share in at-the-market offerings.
[3] Shares issued pursuant to a private placement with accredited investors for $1.24 per share.
[4] Shares of common stock sold for between $1.25 and $1.38 per share in at-the-market offerings.
[5] Shares of common stock sold for $2.111 per share in an at-the-market offering.