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Loans payable (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Nov. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Loans payable        
Loans from FFG   $ 5,912   $ 7,305
Unamortized debt discount   (2,326)   (2,586)
Total Loans payable, net   3,586   $ 4,719
Scheduled early repayment $ 3,300      
Principal payment   $ 1,256 $ 0  
Adjustment        
Loans payable        
Deferred income reduced $ 300      
Minimum        
Loans payable        
Interest rate (as a percent)   0.75%    
Maximum        
Loans payable        
Interest rate (as a percent)   1.00%