Summary of Significant Accounting policies - Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity Method Investments
Costs of sales	$ 71,546	$ 67,632	$ 85,646
Investment In Promon A
Equity Method Investments
Ownership percentage	17.00%
Impairment of investments	$ 0	0	$ 0
Accounts Payable and Accrued Liabilities | Investment In Promon A
Equity Method Investments
Costs and Expenses	1,500	2,200
Cost of goods | Investment In Promon A
Equity Method Investments
Costs and Expenses	$ 4,000	$ 2,500