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Summary of Significant Accounting Policies - Foreign Operations (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Assets	$ 11,121,000	$ 10,942,000
CHINA
Property, Plant and Equipment [Line Items]
Assets	$ 103,000	$ 151,000

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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No definition available.

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