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Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Oct. 22, 2019
Feb. 28, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Oct. 23, 2019
Debt            
Conversion price           $ 0.40
Amount was recorded as a credit to additional paid in capital     $ 49,342   $ 49,130  
Convertible notes            
Debt            
Proceeds from debt issued   $ 500        
Shares issued on debt conversion   1,565,300        
Conversion price           $ 0.40
Convertible interest rate (as a percentage)     5.00%      
Interest on principal     $ 0 $ 6    
Debt beneficial conversion feature $ 401          
Amortization of debt discount     $ 0 $ 8