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Stock Issuance (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 08, 2020
Feb. 28, 2020
Feb. 10, 2020
Mar. 31, 2020
Jan. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 16, 2020
Stock Authorization And Issuance [Line Items]                      
Outstanding warrants           14,900,000     14,900,000    
Sale of common stock           $ 768 $ 2,850 $ 60      
Estimated fair market value           2,300     $ 2,300    
Proceeds from warrants exercised                 900    
Change in fair value of contingent payment obligations           $ (1,142)   365 $ (3,382) $ 823  
Aspire Capital Fund, LLC [Member]                      
Stock Authorization And Issuance [Line Items]                      
warrants exercised           1,070,000          
Proceeds from warrants exercised           $ 380          
Unsecured Note [Member]                      
Stock Authorization And Issuance [Line Items]                      
Proceeds from sale of contingent payment rights           $ (700)          
Liquidated damages           1.00%          
Maximum liquidated damages in the event in the even the common stock is not registered for resale within specific time periods           $ 100          
Unsecured contingent payment obligation           900          
Change in fair value of contingent payment obligations       $ 400              
Aspire Capital [Member]                      
Stock Authorization And Issuance [Line Items]                      
Warrants to purchase common stock   5,000,000                  
Exercise price per warrant   $ 0.74                  
Aspire Capital [Member] | Beneficial Owner [Member] | Aspire Capital Fund, LLC [Member]                      
Stock Authorization And Issuance [Line Items]                      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   9.99%                  
Aspire Capital, Amendment [Member]                      
Stock Authorization And Issuance [Line Items]                      
Warrants to purchase common stock   5,000,000                  
Exercise price per warrant   $ 0.35                  
Consideration   $ 0.001                  
warrants exercised   1,430,000                  
Proceeds from warrants exercised   $ 500                  
Issuance of stock to consultants, shares   1,780,000                  
Common Stock [Member]                      
Stock Authorization And Issuance [Line Items]                      
Sale of common stock           $ 43 $ 39 $ 6      
Issuance of stock to consultants, shares 30,000                    
Issuance of stocks to consultants $ 10                    
Maximum [Member] | Unsecured Note [Member]                      
Stock Authorization And Issuance [Line Items]                      
Liquidated damages           6.00%          
Maximum [Member] | Aspire Capital, Amendment [Member] | Beneficial Owner [Member] | Aspire Capital Fund, LLC [Member]                      
Stock Authorization And Issuance [Line Items]                      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   19.99%                  
Weighted Average [Member]                      
Stock Authorization And Issuance [Line Items]                      
Warrant term           3 years 4 months 24 days     3 years 4 months 24 days    
Exercise price per warrant           $ 0.43     $ 0.43    
Private Placements With Accredited Investors [Member]                      
Stock Authorization And Issuance [Line Items]                      
Sale of common stock, number of shares       2,571,432              
Sale of common stock       $ 900 $ 200            
Sale of stock price per share       $ 0.35     $ 0.35        
Private Placements With Accredited Investors B [Member]                      
Stock Authorization And Issuance [Line Items]                      
Sale of common stock, number of shares         1,169,232            
Sale of stock price per share         $ 0.13            
Private Placements With Accredited Investors C [Member]                      
Stock Authorization And Issuance [Line Items]                      
Sale of common stock, number of shares         166,667            
Sale of stock price per share         $ 0.15            
Chelsea Investor Relations [Member]                      
Stock Authorization And Issuance [Line Items]                      
Issuance of stock to consultants, shares     500,000                
Issuance of stocks to consultants     $ 150                
Agreement term                 24 months    
Tailwinds Research Group LLC [Member]                      
Stock Authorization And Issuance [Line Items]                      
Warrants to purchase common stock                     200,000
Exercise price per warrant                     $ 1.00
Estimated fair market value                     $ 60
Agreement term                 12 months    
Securities Purchase Agreements [Member]                      
Stock Authorization And Issuance [Line Items]                      
Sale of common stock, number of shares           4,365,296          
Sale of common stock           $ 1,500          
Sale of stock price per share           $ 0.35     $ 0.35