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Summary of Significant Accounting policies - Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity Method Investments        
Impairment charges     $ 0 $ 0
Costs of sales $ 14,856 $ 15,478 $ 46,648 49,773
Investment In Promon A        
Equity Method Investments        
Ownership percentage 17.00%   17.00%  
Costs of sales $ 1,000 $ 200 $ 3,000 $ 1,600
Amount owed included in accounts payable and accrued liabilities $ 1,400   $ 1,400