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Summary of Significant Accounting Policies (Leases and Depreciation) (Details)	6 Months Ended
	Jun. 30, 2021
Furniture, fixtures, computers and related hardwares | Minimum
Estimated useful life of long-lived assets
Estimated useful life	5 years
Furniture, fixtures, computers and related hardwares | Maximum
Estimated useful life of long-lived assets
Estimated useful life	8 years
Building
Estimated useful life of long-lived assets
Estimated useful life	27 years 6 months

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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