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Commitments and Contingencies (Details)
Sep. 30, 2021
USD ($)
entity
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]    
Restricted cash, short term $ 6,000,000.0 $ 5,000,000.0
Restricted cash, long-term 10,000,000 5,000,000
Related Party Transaction [Line Items]    
Accrued payroll and related liabilities 4,498,000 3,257,000
Retention Agreements    
Related Party Transaction [Line Items]    
Accrued payroll and related liabilities $ 800,000  
Tinuum Group, LLC    
Related Party Transaction [Line Items]    
Number of entities affiliated with related parties | entity 2  
Limited guarantees, percent 50.00%  
Liabilities or expense $ 0  
Surety Agreement    
Debt Instrument [Line Items]    
Restricted cash, long-term $ 10,000,000 $ 5,000,000