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The Company - Liquidity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Aug. 31, 2020
Preferred Units [Line Items]          
Convertible preferred units   $ 819,694 $ 629,089 $ 819,694  
Convertible preferred units outstanding   633,261 542,729    
Proceeds from the sale of convertible preferred units $ 40,500 $ 192,500 $ 18,500    
Fluor Enterprises          
Preferred Units [Line Items]          
New equity financing   753,306      
Convertible preferred units   $ 0 $ 10,000   $ 10,000
Convertible preferred units issued     5,208    
Share price     $ 1.92   $ 1.92
Convertible preferred units outstanding   0 0    
Proceeds from the sale of convertible preferred units   $ 192,500 $ 8,500