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Derivative Liabilities - Schedule of Sensitivity Analysis (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Altria Warrant    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price $ 26,300 $ 36,436
Weighted average expected life 14,249 17,471
Expected annualized volatility 27,711 33,343
Pre-emptive Rights    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price 2,779 2,743
Weighted average expected life 1,744 2,366
Expected annualized volatility 2,652 2,180
Top-up Rights    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price 4,939 9,577
Weighted average expected life 1,272 2,178
Expected annualized volatility $ 4,769 $ 7,714