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Summary of Significant Accounting Policies - Principles of Consolidation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Other comprehensive income recognized	$ 0	$ 0	$ 0

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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