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Going Concern (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 14 Months Ended
Apr. 17, 2019
Oct. 09, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Dec. 31, 2019
Sep. 05, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]                  
Working capital     $ (700)   $ (700)     $ (700)  
Cash and cash equivalents     393 $ 0 393 $ 0 $ 1,588 393  
Restricted cash     611   611     611  
Net loss     $ 2,083 $ 2,160 4,151 4,398 7,500    
Net cash used in operating activities         (3,356) (4,230) $ (8,500)    
Proceeds from issuance of private placement of equity securities $ 2,000 $ 3,000              
Net proceeds from sale of common stock         $ 1,272 $ 2,921      
Secured Promissory Note | Private Placement                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                  
Secured note principal amount                 $ 1,500
Common Stock | Market Issuance Sales Agreement                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                  
Net proceeds from sale of common stock               $ 2,300