Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Assets transferred from Level 1 to Level 2	$ 0	$ 0
Assets transferred from Level 2 to Level 1	0	0
Liabilities transferred from Level 1 to Level 2	0	0
Liabilities transferred from Level 2 to Level 1	0	0
Transfer of assets into (out of) level 3	0	0
Transfer of liabilities into (out of) level 3	0	0
Impairment losses	0	0
Accrued liabilities for legal and other contingencies	0	0
Restricted cash	$ 0	$ 0

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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