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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands			12 Months Ended
	Dec. 31, 2020 USD ($) customer	Jul. 20, 2017 USD ($)	Dec. 31, 2021 USD ($) customer	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer
Customer Concentration
Restricted cash	$ 169,000		$ 275,100	$ 169,000
Restricted Cash			650,900
Letter of credit	152,400		286,000	152,400
Construction escrow	0		67,700	0
Consideration held by paying agent.			10,000
Reduction in revenue		$ 10,900		399,700
Consolidated revenue			502,342	(93,237)	$ 229,975
Letter of Credit
Customer Concentration
Letter of credit	$ 500		$ 0	$ 500
Accounts receivable \| Customer concentration \| Customers
Customer Concentration
Number of customers \| customer	2		1	2
Concentration risk (as a percent)			46.60%	62.60%
Revenues \| Customer concentration \| Customers
Customer Concentration
Number of customers \| customer	2		3	2	2
Concentration risk (as a percent)			75.70%	156.20%	49.70%
Warrants issued with the Amazon, Inc transaction agreement
Customer Concentration
Reduction in revenue	$ 399,700		$ 500	$ 420,000	$ 4,100
Warrants issued with the Amazon, Inc transaction agreement \| Customer concentration \| Amazon
Customer Concentration
Consolidated revenue				$ 310,100
Warrants issued with the Amazon, Inc transaction agreement \| Revenues \| Customer concentration \| Amazon
Customer Concentration
Concentration risk (as a percent)				332.40%
Provision for common stock warrants				$ 420,000