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Revenue (Details) - Schedule of accrued warranty liability - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of accrued warranty liability [Abstract]      
Balance at the beginning of the period $ 1,735 $ 1,009  
Acquisition date accrual for World Energy acquisition 25    
Accrual for warranties issued 98 912 $ 415
Warranty fulfillment charges (201) (186) (316)
Balance at the end of the period $ 1,657 $ 1,735 $ 1,009