Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional information - August 2019 Equity Offering (Details)

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Stockholders' Equity - Additional information - August 2019 Equity Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity Offering          
Proceeds from Issuance of Common Stock       $ 2,467 $ 8,459
Common Stock [Member]          
Equity Offering          
Stock Issued During Period, Shares, New Issues   1,480,000 850,000    
August 2019 Equity Offering | Warrant Liability [Member]          
Equity Offering          
Proceeds from Issuance of Warrants   $ 1,400      
August 2019 Equity Offering | Common Stock [Member]          
Equity Offering          
Stock Issued During Period, Shares, New Issues 1,480,000        
August 2019 Equity Offering | Additional Paid-In Capital [Member]          
Equity Offering          
Proceeds from Issuance of Common Stock   $ 600      
August 2019 Equity Offering | Pre-Funded Warrants [Member] | Common Stock [Member]          
Equity Offering          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,372,314        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.01        
August 2019 Equity Offering | Placement Warrants [Member] | Common Stock [Member]          
Equity Offering          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,852,314        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.07