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Stockholders' Equity - Issuance of Common Stock and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Nov. 29, 2019
Jan. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class Of Warrant Or Right, Warrants Issued     3,682,729  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.125  
Amount paid for clearing fees   $ 231    
Offering Costs     $ 474  
Proceeds from the Issuance of Common Stock and Warrants, Net of Issuance Costs     2,300  
Proceeds from Issuance or Sale of Equity     275  
Payments on the Iliad Note     $ 226 $ 0
Debt Instrument, Proceeds To Be Paid To Lender, Percent     10.00%  
Note Purchase Agreement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payments on the Iliad Note     $ 226  
Debt Instrument, Proceeds To Be Paid To Lender, Percent 10.00%      
Institutional Investor [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class Of Warrant Or Right, Warrants Issued     3,441,803  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.674  
Private Placement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class Of Warrant Or Right, Warrants Issued     240,926  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.9988  
Amount paid for placement agent commissions   193    
Amount paid related to expenses for registered direct offering and concurrent private placement   $ 50