Summary of Significant Accounting Policies - Restricted Cash and Concentration of credit risk (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) number_of_customer	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Summary of Significant Accounting Policies
Restricted cash \| $	$ 156,734	$ 14,678
Number of largest customers \| number_of_customer	10
Revenue \| Customer Concentration Risk \| Ten Largest Customers
Summary of Significant Accounting Policies
Revenue from contract with customer	9.00%	6.00%	5.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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