Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Summary of Significant Accounting Policies - Foreign Currency Risk (Details)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Jun. 30, 2020 USD ($)	Dec. 31, 2018 USD ($)
Foreign Currency Risk [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 38,960,263		$ 49,622,714		$ 64,921,117	$ 59,966,031
RMB
Foreign Currency Risk [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 33,876,119	¥ 218,843,110	$ 42,953,388	¥ 280,266,558