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Summary of Significant Accounting Policies - Investments in Affiliates (Details)	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2020
Sub161 Pty Limited | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
VIEs ownership percentage		26.40%	26.00%
Nikkei-MEL Co. Limited
Schedule of Equity Method Investments [Line Items]
VIEs ownership percentage	50.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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