Number of shares issued during the period as a result of the conversion of convertible securities.

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Variable Interest Entities and Joint Ventures (Details) - USD ($) $ in Millions	Feb. 23, 2021	Sep. 07, 2021	Mar. 24, 2019
The9 Joint Venture \| Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Conversion of convertible securities (in shares)	423,053
The Geely Intellectual Property License Agreement
Schedule of Equity Method Investments [Line Items]
One-time license amount paid		$ 50.0
The9 Limited \| The9 Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage			50.00%
Conditional obligation			$ 5.0