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Summary of Significant Accounting policies - Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity Method Investments        
Impairment charges     $ 0 $ 0
Costs of sales $ 16,470 $ 18,225 $ 31,792 34,295
Investment In Promon A        
Equity Method Investments        
Ownership percentage 17.00%   17.00%  
Costs of sales $ 500 $ 100 $ 2,000 $ 1,400
Amount owed included in accounts payable and accrued liabilities $ 1,200   $ 1,200