Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($) note	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Oct. 29, 2019 $ / shares	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of convertible promissory notes | note				2
Provision for depreciation				$ 833,000	$ 460,000
Impaired related asset retirement costs			$ 1,500,000	0	2,000,000	$ 1,500,000
Impairment loss	$ 5,600,000			101,470,000	18,089,000	0
Impairment loss of intangible assets				71,070,000	33,230,000	73,669,000
Digital currency transaction amount received						$ 61,100,000
Share price (in dollars per share) | $ / shares			$ 0.23			$ 0.23
Inventory				6,159,000	0
Recorded impairment losses				1,500,000	200,000	$ 3,000,000
Impairment of equity method investments				7,864,000	16,650,000	13,100,000
Impairment losses right of use assets				100,000	6,300,000	0
Warranty liability				500,000
Foreign currency translation adjustments			$ (100,000)	(200,000)	100,000	(100,000)
Escrow trust balances				21,400,000	0
Advertising and marketing costs				2,300,000	200,000	24,394
Interest or penalties of uncertain tax positions				0	0	0
Operating right of use assets				12,827,000	155,000
Lease liabilities				12,733,000	100,000
Various Acquisitions
Summary Of Significant Accounting Policies [Line Items]
Impairment loss of intangible assets				50,600,000	20,400,000	5,700,000
New York City Headquarter
Summary Of Significant Accounting Policies [Line Items]
Lease liabilities							$ 6,400,000
Impairment loss		$ 5,300,000		100,000		0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Fintech Village
Summary Of Significant Accounting Policies [Line Items]
Sale of discontinued operation				2,800,000
Incurred commissions and fees				$ 200,000
Digital Currency
Summary Of Significant Accounting Policies [Line Items]
Impairment loss of intangible assets			$ 61,100,000
Digital currency transaction amount received						8,300,000
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Operating right of use assets									$ 3,600,000
Lease liabilities									$ 3,700,000
Minimum | Digital Currency
Summary Of Significant Accounting Policies [Line Items]
Share price (in dollars per share) | $ / shares								$ 17.00
Maximum | Digital Currency
Summary Of Significant Accounting Policies [Line Items]
Share price (in dollars per share) | $ / shares								$ 1.84
Furniture and office equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property and equipment				3 years
Furniture and office equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property and equipment				10 years
Vehicles | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property and equipment				3 years
Vehicles | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property and equipment				5 years
Electronic equipment
Summary Of Significant Accounting Policies [Line Items]
Useful life of property and equipment				5 years
Fintech Village
Summary Of Significant Accounting Policies [Line Items]
Provision for depreciation				$ 0
Impairment of assets					$ 3,300,000	$ 2,300,000