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Related party Transactions - Additional Information (Details) $ / shares in Units, item in Millions				1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended
	Jul. 01, 2020 USD ($)	Jun. 05, 2020 USD ($) $ / shares shares	Feb. 20, 2019 USD ($)	Nov. 30, 2019 USD ($)	Jul. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) shares	Dec. 31, 2019 USD ($) $ / item	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) item	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / item	Dec. 19, 2019 $ / shares	Oct. 29, 2019 $ / shares $ / item	Oct. 28, 2019 $ / item	Jun. 30, 2019 USD ($)	Feb. 22, 2019 $ / shares
Related Party Transaction [Line Items]
Intangible assets, net						$ 52,398,000	$ 52,771,000			$ 52,398,000		$ 52,771,000
Long term investment						22,651,000	22,621,000			22,651,000		22,621,000
Salary, severance and expenses			$ 800,000						$ 600,000
Due to other related parties							200,000					200,000
Impairment loss							61,100,000
Amount due to related parties						1,333,000	3,962,000			1,333,000		3,962,000
Conversion price of note convertible \| $ / shares													$ 1.00	$ 1.84			$ 1.84
Amount of debt converted										4,600,000
Amount of debt transferred										13,900,000
Debt Instrument, Interest Rate, Stated Percentage													10.00%
Service charges						0		$ 0		2,000	$ 467,000
Amount due from related parties						$ 1,601,000	$ 1,256,000			$ 1,601,000		$ 1,256,000
Amer Global Technology Limited [Member]
Related Party Transaction [Line Items]
Ownership interest disposed						10.00%				10.00%
GTBs
Related Party Transaction [Line Items]
Quoted price \| $ / item							0.23					0.23		1.84	17.00
Selling, general and administrative expenses
Related Party Transaction [Line Items]
Salary, severance and expenses										$ 800,000
Borrowing from Dr. Wu. and his affiliates
Related Party Transaction [Line Items]
Short-term Debt						$ 3,500,000				$ 3,500,000
Conversion price of note convertible \| $ / shares		$ 0.59
Amount of debt converted		$ 1,500,000
Shares issued upon conversion of debt \| shares		2,600,000
Amount of debt transferred		$ 400,000
Borrowing from DBOT
Related Party Transaction [Line Items]
Short-term Debt																$ 550,000
Repayments of short term debt					$ 300,000
Debt Instrument, Interest Rate, Stated Percentage																0.00%
Digital asset management services [Member]
Related Party Transaction [Line Items]
Assets sold under agreements carrying amount							$ 7,100,000					$ 7,100,000
Digital asset management services [Member] \| Measurement Input, Discount Rate [Member]
Related Party Transaction [Line Items]
Estimated value of GTB							76.0					76.0
Digital asset management services [Member] \| Expected term
Related Party Transaction [Line Items]
Estimated value of GTB							3.0					3.0
Digital asset management services [Member] \| Expected volatility
Related Party Transaction [Line Items]
Estimated value of GTB							155.0					155.0
Digital asset management services [Member] \| Expected dividend yield
Related Party Transaction [Line Items]
Estimated value of GTB							0					0
Digital asset management services [Member] \| Risk free interest rate
Related Party Transaction [Line Items]
Estimated value of GTB							2.25					2.25
Digital asset management services [Member] \| Level II
Related Party Transaction [Line Items]
Consideration on sale of assets												$ 40,700,000
Shenma
Related Party Transaction [Line Items]
Consideration on sale of assets				$ 4,900,000
Payment of first installment				$ 500,000
Percentage of ownership interest acquired				1.72%
Beijing Financial Holdings Limited
Related Party Transaction [Line Items]
Amount of debt transferred		$ (400,000)
Beijing Financial Holdings Limited \| Other current liabilities
Related Party Transaction [Line Items]
Amount due to related parties							$ 700,000					$ 700,000
Beijing Financial Holdings Limited \| Mobile Energy Group
Related Party Transaction [Line Items]
Common shares \| shares						10,000				10,000
Conversion price of note convertible \| $ / shares		$ 0.59
Service agreement with SSSIG \| Selling, general and administrative expenses
Related Party Transaction [Line Items]
Amount due to related parties						$ 300,000				$ 300,000
Transaction with related party	$ 1,400,000
Service charges						400,000				400,000
Glory
Related Party Transaction [Line Items]
Amount due to related parties						500,000				500,000
Amount due from related parties						200,000				200,000
Research and development contract with a related party \| Research and development expense
Related Party Transaction [Line Items]
Transaction with related party										$ 2,800,000
Service charges						$ 1,300,000
GTD
Related Party Transaction [Line Items]
Assets sold under agreements carrying amount									$ 20,400,000
Number of GTB received for services provided to GTD \| item									1.3
GTD \| Animation copy right
Related Party Transaction [Line Items]
Intangible assets, net									$ 200,000
GTD \| License content
Related Party Transaction [Line Items]
Licensed content									17,000,000.0
GTD \| Nanjing Shengyi Network Technology Co., Ltd
Related Party Transaction [Line Items]
Long term investment									$ 3,200,000
GTD \| Nanjing Shengyi Network Technology Co., Ltd \| Ideanomics, Inc [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest									13.00%