Condensed Consolidated Statements of Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Stock	Class A Common Stock Cumulative Effect, Period of Adoption, Adjustment	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2020					93,099,596	64,000,588
Beginning balance at Dec. 31, 2020	$ (579,338)				$ 9	$ 6	$ 1,817,760	$ (5,974)	$ (2,391,139)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of The9 Conditional Obligation (in shares)					423,053
Conversion of The9 Conditional Obligation	2,863						2,863
Stock-based compensation	2,520						2,520
Exercise of stock options (in shares)					1,254,624
Exercise of stock options	2,650						2,650
Issuance of warrants	1,988						1,988
Foreign currency translation adjustment	508							508
Net loss	(75,525)								(75,525)
Ending balance (in shares) at Mar. 31, 2021					94,777,273	64,000,588
Ending balance at Mar. 31, 2021	(644,334)				$ 9	$ 6	1,827,781	(5,466)	(2,466,664)
Beginning balance (in shares) at Dec. 31, 2021			0
Beginning balance at Dec. 31, 2021			$ 0
Beginning balance (Accounting Standards Update 2020-06) at Dec. 31, 2021				$ 32,900
Ending balance (in shares) at Mar. 31, 2022			0
Ending balance at Mar. 31, 2022			$ 32,900
Beginning balance (in shares) at Dec. 31, 2021					168,693,323	0
Beginning balance at Dec. 31, 2021	567,654				$ 17	$ 0	3,482,226	(6,945)	(2,907,644)
Beginning balance (Accounting Standards Update 2020-06) at Dec. 31, 2021		$ (20,265)								$ (20,265)
Beginning balance (Accounting Standards Update 2016-02 Cumulative Effect, Period of Adoption) at Dec. 31, 2021		$ 3,393								$ 3,393
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to the commitment to issue Class A and Class B Common Stock (in shares)					68,742,020	64,000,588
Issuance of shares pursuant to the commitment to issue Class A and Class B Common Stock (Note 3)	0				$ 7	$ 6	(13)
Stock-based compensation	3,347						3,347
Exercise of stock options (in shares)					761,675
Exercise of stock options	1,855						1,855
Foreign currency translation adjustment	(564)							(564)
Net loss	(153,098)								(153,098)
Ending balance (in shares) at Mar. 31, 2022					238,197,018	64,000,588
Ending balance at Mar. 31, 2022	$ 402,322				$ 24	$ 6	$ 3,487,415	$ (7,509)	$ (3,077,614)