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Stock Subscription Notes Receivable - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Stock Subscription Notes Receivable [Line Items]
New stock subscription notes principal payments received	$ 34,000	$ 100,000
Combined total of outstanding principal	$ 600,000		$ 600,000
Promissory Note | Minimum
Stock Subscription Notes Receivable [Line Items]
Promissory note interest rate	3.25%
Promissory Note | Maximum
Stock Subscription Notes Receivable [Line Items]
Promissory note interest rate	4.75%

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Contractual interest rate for funds borrowed, under the debt agreement.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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