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Derivative Liabilities - Schedule of Sensitivity Analysis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Altria Warrant    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price at issuance date $ 25,819 $ 36,436
Weighted average expected life 13,541 17,471
Expected annualized volatility 26,183 33,343
Pre-emptive Rights    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price at issuance date 2,527 2,743
Weighted average expected life 1,988 2,366
Expected annualized volatility 2,269 2,180
Top-up Rights    
Sensitivity Analysis, Impact of 10 Percent Decrease (Increase) on Net Income (Loss) [Abstract]    
Share price at issuance date 2,989 9,577
Weighted average expected life 2,121 2,178
Expected annualized volatility $ 2,602 $ 7,714