Promissory Notes - Additional Information (Details) $ / shares in Units, shares in Millions											3 Months Ended		6 Months Ended
	Feb. 08, 2021 USD ($) $ / shares	Jan. 28, 2021 USD ($) $ / shares	Jan. 15, 2021 USD ($) $ / shares	Jan. 04, 2021 USD ($) $ / shares	Nov. 10, 2020	May 13, 2020 USD ($)	May 13, 2020 USD ($) installment	May 03, 2020 USD ($) installment	May 01, 2020 USD ($) installment	Apr. 10, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 lease
Debt Instrument [Line Items]
Principal amount											$ 81,224,000		$ 81,224,000		$ 565,000
Interest expense												$ 8,900,000		$ 12,000,000.0
Amortization												8,600,000		11,400,000
Operating lease liability									$ 7,200,000		12,470,000		12,470,000		7,200,000
Unpaid consideration													220,000,000	2,000,000
Terminated and Vacated Lease
Debt Instrument [Line Items]
Number of leases | lease																1
Operating lease liability												900,000		900,000
$80.0 Million Convertible Debenture due August 8, 2021 - YA II PN
Debt Instrument [Line Items]
Senior secured convertible note	$ 80,000,000.0
Proceeds from convertible debt	$ 80,000,000.0
Interest expense											800,000		1,200,000
Interest rate	4.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 4.95
Security purchase agreement pursuant of YA II PN, Ltd
Debt Instrument [Line Items]
Proceeds from convertible debt														$ 2,000,000.0
$37.5 Million Convertible Debenture due July 4 2021 - YA II PN
Debt Instrument [Line Items]
Senior secured convertible note				$ 37,500,000
Proceeds from convertible debt				$ 37,500,000
Interest expense											$ 0		25,479
Interest rate				4.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares				$ 2.00
Closing of shares of common stock value | shares											18.8
$37.5 Million Convertible Debenture due July 4 2021 - YA II PN | Maximum
Debt Instrument [Line Items]
Interest rate	18.00%	18.00%	18.00%	18.00%
$37.5 Million Convertible Debenture due July 15 2021 - YA II PN
Debt Instrument [Line Items]
Senior secured convertible note			$ 37,500,000
Proceeds from convertible debt			$ 37,500,000
Interest expense											$ 0		46,301
Interest rate			4.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares			$ 3.31
Closing of shares of common stock value | shares											11.3
$65.0 Million Convertible Debenture due July 28 2021 - YA II PN
Debt Instrument [Line Items]
Senior secured convertible note		$ 65,000,000.0
Proceeds from convertible debt		$ 65,000,000.0
Interest expense											$ 0		53,699
Interest rate		4.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares		$ 4.12
Closing of shares of common stock value | shares											15.8
Vendor Note Payable
Debt Instrument [Line Items]
Principal amount											$ 105,000		105,000		$ 105,000
Paycheck Protection Program | Unsecured Debt
Debt Instrument [Line Items]
Interest expense											$ 909		$ 2,048
Interest rate										1.00%
Debt instruments, number of installments					18
Debt instrument, installment payable										$ 18,993
Unpaid consideration										$ 300,000
DBOT | Vendor Note Payable
Debt Instrument [Line Items]
Interest expense												$ 100,000
Interest rate						0.25%	0.25%					4.00%		4.00%
Initial executed an unsecured promissory note						$ 30,000
Unsecured promissory note						60,000
Debt instruments, number of installments | installment							2
Debt instrument, installment payable						$ 30,000	$ 30,000
Operating lease liability												$ 900,000		$ 900,000
US Hybrid | Paycheck Protection Program | Unsecured Debt
Debt Instrument [Line Items]
Interest rate								1.00%
Unpaid consideration								$ 500,000
Grapevine Logic, Inc. ("Grapevine") | Paycheck Protection Program | Unsecured Debt
Debt Instrument [Line Items]
Interest rate									1.00%
Debt instruments, number of installments | installment									18
Debt instrument, installment payable									$ 7,000
Unpaid consideration									$ 100,000
WAVE | Paycheck Protection Program | Unsecured Debt
Debt Instrument [Line Items]
Interest rate								1.00%
Debt instruments, number of installments | installment								18
Debt instrument, installment payable								$ 12,630
Unpaid consideration								$ 300,000
Accrued Interest
Debt Instrument [Line Items]
Principal amount												15,600,000		15,600,000
Long-term debt												$ 10,800,000		$ 10,800,000