Related Party Transactions (Details) $ / shares in Units, ¥ in Millions, shares in Millions				1 Months Ended			3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 05, 2020 USD ($) $ / shares shares	May 01, 2020 USD ($)	Apr. 10, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 CNY (¥)	Nov. 30, 2019 USD ($) installment	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($)	May 31, 2020 USD ($)	May 31, 2020 CNY (¥)	Nov. 25, 2019 USD ($) $ / shares	Feb. 08, 2019 USD ($) $ / shares	May 10, 2012 USD ($) $ / shares
Related Party Transaction [Line Items]
Principal amount							$ 81,224,000				$ 81,224,000		$ 565,000
Amount due to related parties							1,111,000				1,111,000		882,000
Interest expense									$ 8,900,000			$ 12,000,000.0
Accrued expenses, salary and other current liabilities											5,794,000	(1,919,000)
Salary, severance and expenses												100,000
Due to other related parties							100,000				100,000		100,000
Professional fees							7,439,000		2,372,000		12,607,000	4,128,000
Amount due from related parties							294,000				294,000		240,000
Common stock issuance								$ 53,407,000	$ 32,502,000	$ 1,000,000
Payments to acquire equity Interest											100,579,000	0
Unpaid consideration											220,000,000	$ 2,000,000
Paycheck Protection Program | Unsecured Debt
Related Party Transaction [Line Items]
Interest rate			1.00%
Interest expense							909				2,048
Unpaid consideration			$ 300,000
Service agreement with SSSIG
Related Party Transaction [Line Items]
Due to other related parties							600,000				600,000
Related party transaction, amounts of transaction							400,000				1,400,000
Professional fees							400,000				400,000
Glory
Related Party Transaction [Line Items]
Due to other related parties													500,000
Amount due from related parties													200,000
Amounts due from related party							200,000				200,000		300,000
Affiliated Entity
Related Party Transaction [Line Items]
Note receivable														$ 1,400,000	¥ 10.0
Note receivable due one month from disbursement														$ 1,500,000	¥ 10.5
Repayment of note receivable				$ 1,500,000	¥ 10.5
Borrowing from Dr. Wu. and his affiliates
Related Party Transaction [Line Items]
Amount due to related parties							200,000				200,000		200,000
Conversion price of note convertible (in dollars per share) | $ / shares	$ 0.59								$ 0.59			$ 0.59
Shares issued upon conversion of debt (in shares) | shares	2.6
Debt conversion, amount	$ 1,500,000
Debt instrument, increase (decrease), net	400,000								$ 400,000
Payables from related party							700,000				700,000		600,000
Shenma
Related Party Transaction [Line Items]
Common stock issuance						$ 4,900,000
Number of installments | installment						6
Payments to acquire equity Interest											$ 500,000		$ 500,000
Shenma | Qianxi
Related Party Transaction [Line Items]
Percentage of ownership interest						1.72%
Prime Capital Enterprise Pte. Ltd. | Seven Stars Founder Space Industrial Pte. Ltd
Related Party Transaction [Line Items]
Percentage of ownership interest														50.00%	50.00%
Seven Stars Innovative Industries Group Limited | Seven Stars Founder Space Industrial Pte. Ltd
Related Party Transaction [Line Items]
Percentage of ownership interest														50.00%	50.00%
SSSIG | Borrowing from Dr. Wu. and his affiliates
Related Party Transaction [Line Items]
Accrued expenses, salary and other current liabilities	$ 400,000						$ 400,000
Grapevine Logic, Inc. ("Grapevine") | Paycheck Protection Program | Unsecured Debt
Related Party Transaction [Line Items]
Interest rate		1.00%
Unpaid consideration		$ 100,000
Convertible Note | Mr. Shane McMahon
Related Party Transaction [Line Items]
Principal amount																		$ 3,000,000.0
Amount due to related parties																		$ 3,000,000.0
Interest rate																		4.00%
Conversion price of note convertible (in dollars per share) | $ / shares	$ 0.59																	$ 1.75
Conversion price of convertible note after amendment (in dollars per share) | $ / shares																		$ 1.50
Interest expense									21,041			$ 50,959
Shares issued upon conversion of debt (in shares) | shares	5.1
Interest payable	$ 300,000
$2.5 Million Convertible Promissory Note | SSSIG
Related Party Transaction [Line Items]
Advance received without any interest																	$ 1,300,000
Convertible promissory note amount not received																	1,200,000
$2.5 Million Convertible Promissory Note | SSSIG | Bruno Wu ("Mr.Wu")
Related Party Transaction [Line Items]
Principal amount																	$ 2,500,000
Interest rate																	4.00%
Conversion price of note convertible (in dollars per share) | $ / shares	$ 0.59																$ 1.83
Interest expense									9,057			21,546
Shares issued upon conversion of debt (in shares) | shares	2.2
$1.0 Million Convertible Promissory Note | SSSIG
Related Party Transaction [Line Items]
Advance received without any interest																$ 250,000
Convertible promissory note amount not received																800,000
$1.0 Million Convertible Promissory Note | SSSIG | Bruno Wu ("Mr.Wu")
Related Party Transaction [Line Items]
Principal amount																$ 1,000,000.0
Interest rate																4.00%
Conversion price of note convertible (in dollars per share) | $ / shares	$ 0.59															$ 1.25
Interest expense									$ 2,493			$ 4,301