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Organization and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Debt security credit losses	$ 0	$ 0
Impairment charges on debt securities			$ 0
Sales commissions amortization period	3 years
Impairment charges	$ 0	0	0
Interest and penalties	$ 0	$ 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 expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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