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Related Party Transactions and Balances - Schedule of Related Party Transactions (Details) - Consulting Services - Altria Pinnacle LLC. - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Consulting fees $ 1,199 $ 3,479  
Accrual for consulting services 0 1,152  
Altria Pinnacle LLC.      
Related Party Transaction [Line Items]      
Consulting fees 1,199 3,479 $ 0
Accrual for consulting services $ 0 $ 1,152