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Unaudited Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]            
Revenues $ 3,694 $ 1,912 $ 4,369 $ 3,144 $ 20,338 $ 7,215
Cost of revenues 2,732 1,868 4,123 3,152 17,594 8,075
Gross profit (loss) 962 44 246 (8) 2,744 (860)
Operating expenses:            
Research and development 2,809 637 4,221 1,651 4,445 2,874
Selling, general, and administrative expenses 10,822 3,003 18,780 5,494 13,593 9,835
Loss from operations (12,669) (3,596) (22,755) (7,153) (15,294) (13,569)
Other (income) expense:            
Interest expense, net 10 1,729 21 3,025 6,370 2,151
Loss on extinguishment of debt 1,038 1,038
Loss on asset disposal 21 21    
Change in fair value of obligation to issue shares of common stock to sellers of World Energy 514 514    
Change in fair value of warrant liability (2,726) (74,731) 35,015
Change in fair value of convertible notes payable derivative liability 8,174 8,737 2,889 (819)
Other income (19) (25)    
Net (loss) income $ (10,469) $ (13,499) $ 51,445 $ (19,953) $ (60,606) $ (14,901)
Net (loss) income per share, basic (in Dollars per share) $ (0.08) $ (0.16) $ 0.37 $ (0.24)    
Net loss per share, diluted (in Dollars per share) $ (0.08) $ (0.16) $ (0.17) $ (0.24)    
Weighted-average shares outstanding, basic (in Shares) 139,237,805 82,990,664 137,416,593 82,577,953    
Weighted-average shares outstanding, diluted (in Shares) 139,237,805 82,990,664 137,598,535 82,577,953    
Net loss per share, basic and diluted (in Dollars per share) $ (10,469) $ (13,499) $ (23,286) $ (19,953) $ (0.72) $ (0.19)
Weighted-average shares outstanding, basic and diluted (in Shares)         84,565,448 79,823,065