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Supplemental Financial Statement Information - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	[1]
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 3,354,000		$ 3,354,000		$ 3,354,000
Write-off	0	$ 0	0	$ 0
China
Cash and Cash Equivalents [Line Items]
Deposits	$ 3,800,000		$ 3,800,000
[1] See Note 1 – Summary of Business and Significant Accounting Policies

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