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Debt - Schedule of Debt (With Related Parties) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Oct. 31, 2019	Sep. 16, 2019
Debt Instrument [Line Items]
Less current portion	$ (24,861,000)	$ (50,252,000)
Long-term debt, less current portion - related party	11,497,000	3,379,000
Antara Financing Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 2,100,000	$ 22,400,000
Less current portion	(18,000,000.0)	(33,600,000)
Long Term Debt With Related Parties [Member]
Debt Instrument [Line Items]
Long-term debt, gross	43,664,000	62,478,000
Debt issuance costs	(18,000)	(36,000)
Debt discount	(7,288,000)	(8,811,000)
Long-term debt, net	36,358,000	53,631,000
Less current portion	(24,861,000)	(50,252,000)
Long-term debt, less current portion - related party	11,497,000	3,379,000
Long Term Debt With Related Parties [Member] \| Four Promissory Notes Issued February 1, 2017 to Former EAF [Member]
Debt Instrument [Line Items]
Long-term debt, gross	9,500,000	9,500,000	$ 9,500,000
Long Term Debt With Related Parties [Member] \| Senior Promissory Note Issued February One Two Thousand And Seventeen To Former EAF [Member]
Debt Instrument [Line Items]
Long-term debt, gross	3,800,000	3,800,000
Long Term Debt With Related Parties [Member] \| Promissory Note Issued February One Two Thousand And Seventeen To Former EAF [Member]
Debt Instrument [Line Items]
Long-term debt, gross	4,000,000	4,000,000
Long Term Debt With Related Parties [Member] \| Secured Convertible Promissory Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross		3,280,000
Long Term Debt With Related Parties [Member] \| Promissory Note Stockholder Issued June One Two Thousand And Eighteen [Member]
Debt Instrument [Line Items]
Long-term debt, gross	1,566,000	1,732,000
Long Term Debt With Related Parties [Member] \| Promissory Note Stockholder Issued February Two Two Thousand And Nineteen [Member]
Debt Instrument [Line Items]
Long-term debt, gross	6,367,000	6,111,000
Long Term Debt With Related Parties [Member] \| Notes Payable Acquired From Ritter [Member]
Debt Instrument [Line Items]
Long-term debt, gross	410,000	439,000
Long Term Debt With Related Parties [Member] \| Antara Financing Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 18,021,000	$ 33,616,000