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Fair Value Measurements (Details) - Schedule of assets and liabilities which are measured at fair value on a recurring basis - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Fair Value Measurements (Details) - Schedule of assets and liabilities which are measured at fair value on a recurring basis [Line Items]    
Private Warrants $ 20,811 $ 81,195
Contingent consideration -– Quantum Fuel Systems, LLC (Quantum) 1,873 1,849
Earnout – World Energy 1,000  
Fair value of obligation to issue    
Fair value of obligation to issue shares of common stock to sellers of World Energy 2,040  
Public Warrants   62,100
Level I [Member]    
Fair Value Measurements (Details) - Schedule of assets and liabilities which are measured at fair value on a recurring basis [Line Items]    
Private Warrants
Contingent consideration -– Quantum Fuel Systems, LLC (Quantum)
Earnout – World Energy  
Fair value of obligation to issue    
Fair value of obligation to issue shares of common stock to sellers of World Energy  
Public Warrants   62,100
Level II [Member]    
Fair Value Measurements (Details) - Schedule of assets and liabilities which are measured at fair value on a recurring basis [Line Items]    
Private Warrants
Contingent consideration -– Quantum Fuel Systems, LLC (Quantum)
Earnout – World Energy  
Fair value of obligation to issue    
Fair value of obligation to issue shares of common stock to sellers of World Energy  
Public Warrants  
Level III [Member]    
Fair Value Measurements (Details) - Schedule of assets and liabilities which are measured at fair value on a recurring basis [Line Items]    
Private Warrants 20,811 81,195
Contingent consideration -– Quantum Fuel Systems, LLC (Quantum) 1,873 1,849
Earnout – World Energy 1,000  
Fair value of obligation to issue    
Fair value of obligation to issue shares of common stock to sellers of World Energy $ 2,040  
Public Warrants